CN114763744B - Connectivity description method of conglomerate reservoir based on mudstone division - Google Patents
Connectivity description method of conglomerate reservoir based on mudstone division Download PDFInfo
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Abstract
The invention provides a method for describing the connectivity of a sandstone reservoir based on mudstone division, which comprises the steps of 1, observing a logging curve, judging a stratum met by a single well, 2, comparing multiple wells, combining stable mudstone layers, 3, comprehensively considering a deposition mode, carrying out mudstone layer spreading description through well vibration combination, 4, carrying out period division on the sandstone body by taking the stable mudstone as an interlayer partition, and 5, verifying the description result of the connectivity of the reservoir through dynamic development and monitoring. The method for describing the connectivity of the sandstone reservoir based on mudstone division has clear thought, simpler operation and lower result multiple-resolution, provides a feasible method for accurately describing the connectivity of the sandstone reservoir, and provides geological support for the water injection development of the sandstone reservoir.
Description
Technical Field
The invention relates to the field of identification of a sandstone oil reservoir, in particular to a method for describing connectivity of a sandstone reservoir based on mudstone division.
Background
The sand gravel sector generally refers to a single sector or mutually interweaved and overlapped sector group of different deposition types, such as a alluvial sector, a turbid accumulation sector, a sector delta, an offshore underwater sector and the like, which are formed by rapid accumulation on water or underwater of a broken sink basin steep slope zone, and mainly comprises a block-like geological rock body consisting of sand rocks and conglomerates. The conglomerate oil reservoir formed by the conglomerate fan body has the characteristics of complex geological structure, large reservoir thickness, rapid lithology rock phase change and strong heterogeneity, and belongs to the class of oil reservoirs with great development difficulty. Such reservoirs are found both at home and abroad. In recent years, the proportion of the sandstone oil reservoir in newly discovered and newly developed oil reservoirs in China is increasing. Therefore, the realization of efficient development of the sandstone reservoir is of great significance.
Unlike conventional sandstone, a sandstone oil reservoir is formed by rapid gravity flow deposition of event accumulation, and has the advantages of poor reservoir layering, complex communication relationship, poor gyrability of conventional logging curves, no obvious characteristics, difficult determination of a mark layer, difficult division of single well period times, difficult comparison of stratum among wells and difficult prediction of reservoir connectivity. Based on the characteristics, the sub-division precision and the inner curtain research precision of the oil reservoir period of the conglomerate are low, the daily water injection development work needs are difficult to meet, the oil reservoir is not obvious in injection production effect in the development process, the whole oil reservoir presents an elastic development situation, and the decline is rapid. Therefore, accurately describing the connectivity of the sandstone reservoir becomes a precondition for realizing the efficient development of the sandstone reservoir, and is also a geological basis for improving the recovery ratio.
The existing method for describing the reservoir connectivity of the conglomerate oil reservoir starts from the angle of reservoir identification, a more accurate deposition mode is established, the reservoir boundary is determined through seismic data, and the reservoir is further subdivided by core data and the like. However, when the method is applied to a complex lithology sandstone oil reservoir, the reservoir identification accuracy is reduced, and the communication body description result cannot be effectively verified in the development process.
The method comprises the following steps of S1, establishing a reservoir physical parameter knowledge base, S2, establishing a reservoir physical prototype model, S3, carrying out model quality inspection on all physical prototype models, and preferably obtaining a final prototype model, S4, coarsening the optimized prototype model, applying the coarsened model to a numerical simulation technology, optimizing model parameter combinations after numerical simulation coarsening, and S5, analyzing a numerical simulation result and determining reservoir connectivity.
The method comprises the steps of constructing a seismic maximum likelihood body based on a three-dimensional seismic data body, carrying out space carving on the seismic maximum likelihood body by utilizing threshold values of attributes of the seismic maximum likelihood body to obtain a space outline of the broken body, selecting a first point and a second point which are located at the same altitude in the space of the broken body, obtaining formation pressure at the first point and formation pressure at the second point, comparing the formation pressure at the first point and the formation pressure at the second point, and judging whether the reservoirs between the first point and the second point are communicated according to comparison results.
The application number of the method is CN202010189180.8, which relates to an automatic identification method of a reservoir configuration interface in a reservoir geological model, and the automatic identification method of the reservoir configuration interface in the reservoir geological model comprises the steps of 1, initializing basic parameters, 2, traversing grids according to IJK, 3, traversing grids of a configuration geometry formed in the step 2, 4, traversing a configuration geometry grid set generated in the step 3 to generate a configuration geometry boundary grid set, 5, adding the generated configuration geometry into the configuration body set established in the step 1, returning to the step 2, and continuing traversing grids until all grids are traversed and stored.
The prior art is greatly different from the prior art, the technical problem which is needed to be solved by the prior art is not solved, and the prior art discloses a novel sandstone reservoir connectivity description method based on mudstone division.
Disclosure of Invention
The invention aims to provide a sandstone reservoir connectivity description method based on mudstone division, which utilizes mudstones to divide a sandstone reservoir period inner curtain so as to describe reservoir connectivity.
The purpose of the invention can be achieved by the following technical measures that the method for describing the connectivity of the sandstone reservoir based on mudstone division comprises the following steps:
step 1, observing a logging curve, and judging that a single well is drilled into a stratum;
step 2, multi-well comparison is carried out, and a stable mud stratum is combined;
step 3, comprehensively considering a deposition mode, and carrying out mudstone layer spreading description through well-seismic combination;
step4, performing stage division on the conglomerate body by taking stable mudstone as a interlaminar partition;
And 5, verifying the description result of the reservoir connectivity through dynamic development and monitoring of the means.
The aim of the invention can be achieved by the following technical measures:
In the step 1, the single well drilling is judged by utilizing the effective logging curves of acoustic time difference, neutrons, density and natural potential and microelectrodes to identify a reservoir and a mudstone layer.
In the step 1, the drilling section with negative abnormality of the natural potential curve is a sand body, the higher overlapping ratio of the three-porosity curve reflects the better physical properties of the stratum of the section, and on the contrary, the part with flat and straight natural potential curve and dispersed three-porosity curve is a mudstone stratum.
In the step 2, according to the characteristic that the mudstone gradually grows and thickens from the core part to the fan end, well points of different deposition areas are selected as standard wells, the characteristic of stratum change is visually reflected through multi-well curve comparison, and the mudstone with relatively stable growth is identified from the characteristics as a comparison mark and combined.
In the step 3, the sand fan deposition mode is comprehensively considered, mud layer spreading description is carried out by means of well vibration combination in a phase control mode, and the unification and closure of the mud layers in the whole area are completed under the constraint of seismic data.
In step 3, the reservoir layer shows high resistivity in the logging response, three porosity curves of acoustic time difference, neutrons and density are basically coincident, and the seismic section is wide and has no messy weak reflection of an obvious reflection axis.
In the step 3, the mudstone has lower resistance in the logging response, the three porosity curves of acoustic time difference, neutrons and density are dispersed, and the seismic section shows clear reflection of a seismic axis and good continuity.
In step3, identifying and numbering mudstones in the standard well drilling according to different characteristics of the mudstones and reservoirs in the logging response and the seismic phase, tracking the mudstones according to the numbers, combining the sand fan deposition characteristics, establishing a longitudinal and plane spreading mode of the mudstones, closing the mudstones in the whole area, completing systematic layer division, and establishing a stratum grid.
In step 4, the internal development of the stable mudstone is communicated with the secondary sector period, cracks in the same period are reformed in the stratum fracturing process, the connectivity is improved, the reservoir connectivity is described on the basis, and the accuracy is improved.
In step 5, referring to the description result of the reservoir connectivity, according to the principles of the secondary correspondence and advanced water injection, the method is characterized in that the wells with more production well sections and fewer mudstone interlayers are optimized to carry out transfer injection in the same secondary period so as to achieve higher injection and production correspondence, after injection and production adjustment is carried out on well groups, the production situation is closely focused, monitoring means are timely utilized, and verification of the reservoir connectivity is further completed through development of effective characteristics.
According to the method for describing the connectivity of the sandstone reservoir based on mudstone division, provided by the invention, on the basis of identifying the sandstone reservoir by utilizing conventional seismic phase data, the curtain mudstones in the sandstone reservoir are screened and combined, and relatively stable mudstones are selected for layer unification, so that the stratum period is divided. Based on the mudstone contrast mode, the development data is combined for verification, and further, the reservoir connectivity description is completed, and the method for describing the reservoir connectivity of the sandstone can be applied to the reservoir transformation and water injection development of the sandstone reservoir with complex lithology. The method is clear in thought, simple to operate and low in result polynomials, provides a feasible method for realizing accurate description of the connectivity of the sandstone reservoir, and provides geological support for the water flooding development of the sandstone reservoir. The method is applied to a salt field salt 22 block of a salt field oil field of an eastern and octyl oil production factory of a victory oil field, injection and production adjustment of an open well group is completed, and a transfer injection well has preliminary effects corresponding to the oil well.
Drawings
FIG. 1 is a flow chart of one embodiment of a method of description of the connectivity of a sandstone reservoir based on mudstone partitioning of the present invention;
FIG. 2 is a schematic diagram of a single well formation drilling encounter in accordance with one embodiment of the present invention;
FIG. 3 is a schematic diagram of a development pattern of a mudstone in a conglomerate sector in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of a multi-well comparison in accordance with an embodiment of the present invention;
FIG. 5 is a schematic diagram of a well-shock bonded implementation mudstone spread in accordance with an embodiment of the present invention;
FIG. 6 is a schematic view of a pattern of sand sector deposition in an embodiment of the invention;
FIG. 7 is a schematic diagram of a principle of connectivity analysis and development verification in an embodiment of the present invention;
FIG. 8 is a schematic illustration of internal communication of salt 22-deviated 47 well group mudstone reservoirs and external reservoir non-communication in an embodiment of the present invention;
FIG. 9 is a schematic illustration of advanced water flooding of a connected and disconnected reservoir within a salt 22-23 well group mudstone reservoir in accordance with an embodiment of the present invention;
FIG. 10 is a graph showing a three-porosity curve of a salt 22-inclined 62 well group for determining reservoir development differences resulting in unconnected state, in accordance with an embodiment of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular forms also are intended to include the plural forms unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, and/or combinations thereof.
As shown in fig. 1, fig. 1 is a flowchart of a method for describing the connectivity of a sandstone reservoir based on mudstone partitioning according to the present invention.
Step 101, judging a stratum encountered by a single well by utilizing the acoustic time difference, neutrons, density three porosities, natural potential, microelectrodes and other effective logging curves, and identifying a reservoir and a mudstone layer;
Step 102, multi-well comparison is carried out, a mudstone layer evolution rule is summarized, and stable mudstones of the inner curtain of the gravel rock body are selected and combined;
Step 103, comprehensively considering a sand sector deposition mode, performing mud layer spreading description by means of well vibration combination in a phase control mode, and completing unification and closure of the mud layer in the whole area under the constraint of seismic data;
104, dividing stratum periods by taking stable mudstone as a interlaminar partition, and describing reservoir connectivity in each period;
and step 105, verifying the description result of the reservoir connectivity through means of dynamic development, monitoring and the like.
Example 1:
In a specific embodiment of the invention, the method for describing the connectivity of the sandstone reservoir based on mudstone partition comprises the following steps:
And step 1, observing a logging curve, and judging that a single well is drilled into a stratum. And analyzing the stratum encountered by single well drilling by utilizing the three porosity curves of acoustic time difference, neutrons and density, and the effective logging curves of natural potential, microelectrodes and the like, and identifying a reservoir and a mudstone layer. The drilling section with negative abnormality of the natural potential curve is a sand body, and the higher overlapping degree of the three-porosity curve reflects the better stratum physical property of the section. In contrast, the portion of the natural potential curve with the flat and three-porosity curve dispersed is the mudstone stratum, as shown in fig. 2.
And 2, comparing multiple wells, and combining and stabilizing the mud stratum. The stable mudstone can wrap sand bodies in the development process, and is scattered and recombined, and the development mode is shown in figure 3. According to the characteristic that the mudstone gradually grows and thickens from the core part to the fan end, well points of different deposition areas are selected as standard wells, the characteristic of stratum change can be visually reflected through multi-well curve comparison, and the mudstone with more stable growth is identified from the characteristics and used as a comparison mark, and is combined as shown in fig. 4.
And 3, comprehensively considering a deposition mode, and carrying out mudstone layer spreading description through well-seismic combination. The reservoir layer shows high resistivity in logging response, three porosity curves of acoustic time difference, neutrons and density are basically coincident, and the reservoir layer shows wide amplitude in a seismic section without messy weak reflection of an obvious reflection axis. The mud rock has low resistance in logging response, scattered three porosities of acoustic time difference, neutrons and density, and the seismic section shows clear reflection of a seismic axis and good continuity. And identifying and numbering the mudstones in the standard well drilling according to different characteristics of the mudstones, the reservoir in the logging response and the earthquake phase, and tracking the mudstones according to the numbers, as shown in fig. 5. In combination with the sand fan deposition characteristics, a longitudinal and plane distribution mode of mudstones is established, and the mudstones are closed in the whole area to complete the division of the system layers, and a stratum grid is established as shown in fig. 6.
And 4, taking the stable mudstone as an interlayer partition, and performing stage division on the gravelly body. By comparing actual production conditions, the internal development of the stabilized mudstone is communicated with the secondary sector period, cracks in the same period can be modified in the stratum fracturing process, and connectivity is improved. Reservoir connectivity is described on this basis, which can improve accuracy. As shown in FIG. 7, the mode 1 is stable mudstone, the perforation sections 1-3 of the No. 1 well are not communicated with the perforation section 2 of the No. 2 well, and the mode 2 is unstable mudstone, so that the mudstone does not play a sealing role, and the perforation sections 3-2, 4-2 and 5-2 of the No. 3 well are communicated with each other.
And step 5, verifying the description result of the reservoir connectivity through means such as dynamic development and monitoring. Referring to the description result of the reservoir connectivity, according to the principles of 'period corresponding and advanced water injection', the transfer injection is carried out on the wells with more production well sections and fewer mudstone interlayers in the same period, so as to achieve higher injection and production correspondence, as shown in fig. 7. After injection and production adjustment is carried out on the well group, production conditions are closely focused, monitoring means are timely utilized, and verification of reservoir connectivity is further completed through development of effective characteristics.
Example 2:
In the embodiment 2 of the invention, after the sand shale and the well shock are identified through well logging and combined, the stable shale is judged to be spread, the stable shale No. 6 shale is divided, a new reborn production section of the salt 22-inclined 49 well 2010.02 and a water injection section of the salt 22-inclined 47 well are in the same communication body, a production layer of the salt 22-inclined 49 well is flooded, and a 2012.11 salt 22-inclined 49 well returns to produce an upper reservoir of the No. 6 shale, the reservoir is not injected with water, and the production characteristics and the analysis connectivity are consistent, as shown in fig. 8.
Example 3:
In the concrete embodiment 3 of the invention, water is injected into a perforation section of 3370-3400 m by a salt 22-23 well, water is injected into a production section of 3430-3532 m of a salt 22-inclined 47 well between No. 6 stable mudstone and No. 7 stable mudstone, and analysis shows that reservoirs between the No. 6 stable mudstone and the No. 7 stable mudstone are mutually communicated, the salt 22-inclined 47 well takes obvious effect in the production process, the liquid amount rises from 6.3 to 7.8, the daily oil rises from 4.1 to 5.1 tons, the area of an indicator diagram is obviously increased, meanwhile, water is injected into a production section of no perforation between the No. 7 stable mudstone and the No. 8 stable mudstone in advance by the salt 22-inclined 47 well, and energy is supplemented for the later-stage upward production of the salt 22-inclined 47 well in advance, so that the development effect is improved, as shown in fig. 9.
Example 4:
In the embodiment 4 of the invention, reservoir evaluation is carried out on the salt 22-inclined 62 well group, the stable mudstone 8 and 9 internal reservoirs are analyzed in the step 1, the acoustic time difference, the neutrons and the density are three-porosity, and the natural potential shows that the reservoir development of 3334-3550 m corresponding to the well salt 22-42 well production layer section is thinner, the mud content is higher, and the analysis considers that the reservoir development of the two well production sections is unstable, so that the connectivity is poor. In the production process, the water injection characteristics of the salt 22-42 wells are not found in the salt 22-62 well, and the dynamic verification and analysis are consistent, as shown in figure 10.
The invention provides a method for describing reservoir connectivity of a conglomerate oil reservoir, which solves the problems of difficult formation comparison and reservoir connectivity description of the conglomerate oil reservoir, utilizes relatively stable mudstone to divide a stratum trellis, completes the description of reservoir connectivity on the basis, realizes effective injection and production correspondence in the development process of the conglomerate oil reservoir, and achieves the purpose of improving recovery ratio.
It should be noted that the above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, but although the present invention has been described in detail with reference to the above embodiment, it will be apparent to those skilled in the art that modifications may be made to the technical solutions described in the above embodiment, or equivalents may be substituted for some of the technical features thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Other than the technical features described in the specification, all are known to those skilled in the art.
Claims (5)
1. The method for describing the connectivity of the sandstone reservoir based on mudstone division is characterized by comprising the following steps of:
step 1, observing a logging curve, and judging that a single well is drilled into a stratum;
step 2, multi-well comparison is carried out, and a stable mud stratum is combined;
step 3, comprehensively considering a deposition mode, and carrying out mudstone layer spreading description through well-seismic combination;
step4, performing stage division on the conglomerate body by taking stable mudstone as a interlaminar partition;
step 5, verifying the description result of the reservoir connectivity through dynamic development and monitoring means;
In the step 1, judging a stratum encountered by a single well drill by utilizing three porosities of acoustic time difference, neutrons and density, natural potential and microelectrode effective logging curves, and identifying a reservoir and a mudstone layer;
In the step 2, according to the characteristic that the mudstone gradually grows and thickens from the core part to the fan end, well points of different deposition areas are selected as standard wells, the characteristic of stratum change is visually reflected through multi-well curve comparison, and the mudstone with more stable growth is identified from the characteristics as a comparison mark and combined;
In the step 3, comprehensively considering a sand sector deposition mode, performing mud layer spreading description by means of well vibration combination in a phase control mode, and completing unification and closure of the mud layer in the whole area under the constraint of seismic data;
Identifying and numbering mudstones in standard well drilling according to different characteristics of the mudstones and reservoirs in logging response and earthquake phases, tracking the mudstones according to the numbers, establishing a longitudinal and planar spreading mode of the mudstones by combining with the sediment characteristics of the sand fan bodies, closing the mudstones in the whole area, completing systematic layer division, and establishing a stratum grid;
In step 4, the internal development of the stable mudstone is communicated with the secondary sector period, cracks in the same period are reformed in the stratum fracturing process, the connectivity is improved, the reservoir connectivity is described on the basis, and the accuracy is improved.
2. The method for describing the connectivity of the sandstone reservoir based on mudstone partition according to claim 1, wherein in the step 1, a drilling section with negative abnormality of a natural potential curve is a sand body, the higher overlapping degree of a three-porosity curve reflects better physical properties of the stratum of the section, and conversely, the part with flat and straight natural potential curve and dispersed three-porosity curve is a mudstone stratum.
3. The method for describing the connectivity of the sandstone reservoir based on mudstone partitioning according to claim 1, wherein in the step 3, the reservoir presents high resistivity in a logging response, three porosity curves of acoustic time difference, neutrons and density are basically coincident, and the seismic section shows a broad amplitude without messy weak reflection of an obvious reflection axis.
4. The method for describing the connectivity of the sandstone reservoir based on mudstone partition according to claim 3, wherein in the step 3, the resistance of the mudstone in the well logging response is low, three porosities of acoustic time difference, neutrons and density are dispersed, and the seismic section shows clear reflection of a seismic axis and good continuity.
5. The method for describing the reservoir connectivity of the sandstone based on mudstone partition according to claim 1 is characterized in that in step 5, the description result of the reservoir connectivity is referred, the wells with more production well sections and fewer mudstone interlayers are optimized to carry out transfer in the same period according to the principles of period correspondence and advanced water injection so as to achieve higher injection and production correspondence, after injection and production adjustment is carried out on well groups, production conditions are closely focused, monitoring means are timely utilized, and verification of the reservoir connectivity is further completed by developing effective characteristics.
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