CN105572726B - A kind of meticulous depiction method of stacked fan body of more phases time under sequence stratigraphic framework - Google Patents
A kind of meticulous depiction method of stacked fan body of more phases time under sequence stratigraphic framework Download PDFInfo
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Abstract
The invention discloses a kind of meticulous depiction methods of stacked fan body of more phases under sequence stratigraphic framework time, and (a) establishes work area sequence stratigraphy framework；(b) feature of the fan body boundary on seismic profile is determined inside Stratigraphic framework；(c) response characteristic of the fan body boundary on log is determined；(d) the single fan body boundary of single phase time on each item comparison section is portrayed by seismic data and well-log information；(e) backbone comparison section is established, step (b) is repeated to step (d), determines sandstone boundary point of each phase time, accurately portray secondary stacked fan body complex of more phases.The advantages of present invention gives full play to the advantage of seismic data and well-log information, integrated use items data improves the precision for portraying fan body boundary, is increased to the rank for portraying single fan body.
Description
Technical field
The present invention relates to a kind of stacked fan bodies of more phases under oil exploration technology field, in particular to sequence stratigraphic framework time
Meticulous depiction method.
Background technique
Stratigraphic framework (stratigraphic framework, stratigraphic architecture) is to answer extensively
For stratum all kinds of in bed succession or the regional space-time ordered arrangement pattern of lithologic unit: Lithostratigraphic Framework
(lithostratigraphic framework/architecture) reflects stratum and lithologic unit space arrangement pattern；
When chronological change screen work (chronostratigraphic framework/architecture) reflects stratum or lithologic unit
Empty type of array.Steno is in the vertical superimposition of sedimentary formation discussed in 1667, lateral continuous, original level principle, it may be said that
It is original Stratigraphic framework concept；Sequence stratigraphic framework is then the Typical Representative of contemporary Stratigraphic framework concept.
Professional conceptual of the present invention is as follows:
(1) Stratigraphic framework: the regional space-time ordered arrangement pattern of all kinds of stratum or lithologic unit in bed succession.
(2) fan body: alluvial fan is that river goes out fan-shaped accumulation body at mountain pass.Generally comprised in the plane of fan body water channel,
Between dike and water channel.Fan (interior wing), middle fan, lower fan (exterior wing) can be divided on longitudinal profile.Due to turbidite fan sand body generally proximate to
Hydrocarbon source rock is developed in groups, easily becomes advantageous oil-gas exploration region with its advantageous source-reservoir-seal assemblage condition.Fan body reservoir
It is the main Storage category of rich accumulation of oil and gas and exploration and development research, to portraying inside description and advantage facies tract and reservoir for fan body
The analysis of structure has major significance to oil-gas exploration and development.
(3) fan body is portrayed: by use a variety of theory and technologies such as geology, geophysics, describe and portray fan body and its
The form and distribution of component part, find and implement the favored site of oil gas reservoir.
Due to the heterogeneity and being typically complex property of cyclicity of fan body, several fan body identification technology of tradition is equal at present
Existing deficiency, so it is quantitative accurate to carry out at present on the basis of the portraying and rest on qualitative description mostly of fan body
Description.
(1) it utilizes the method for seismic data amplitude attribute: strong amplitude being typically exhibited according to Sand member and is rung more continuously
The characteristics of answering feature portrays fan body, and it is a kind of common method that fan body boundary is portrayed with seismic properties, but due to ground
The vertical resolution of shake data is limited, while not portraying sand body under sequence stratigraphic framework, is overlapped mutually development to more phases time
Fan body single fan body cannot be told on vertical, can only portray a fan body group or the development of material resource covers fan bodies more
The boundary of development is concentrated, precision is lower.
(2) utilize the method for seismic data spectral decomposition: the spectral decomposition of seismic data is more than in seism processing
An isolated processing links, may all distort having in seismic signal primitive character from the processes such as superposition, offset are collected
Use information.And these information are vital to the data processing and explanation of high-precision, high reliability.This method is by earthquake
The limitation of data quality and practical geological condition is needed to combine various data and be used in combination to real data progress spectrum analysis
Other processing methods can improve the quality of processing and the reliability of explanation.
(3) earthquake model forward modeling method: this method is cut coherence properties and stratum by seismic data FREQUENCY SPECTRUM DECOMPOSITION TECHNIQUE
Piece combines, and with well logging phase, sedimentary facies data, establishes earthquake model forward modeling, carries out integrated forecasting, this method pair to fan body
Data degree of dependence is higher, therefore can not set up accurate forward model in no well or few well area, and precision of prediction is limited to
Data situation, is of limited application.
(4) seismic facies analysis method: change method and infer by seismic facies analysis the variation of depositional environment, determine reservoir
The distribution of sedimentary facies belt and fan body, at the same to the determination of seismic facies and sedimentary facies corresponding relationship need to use well-log information and
The observation of rock core, area for not well or does not bore the more difficult judgement sedimentary facies belt in region for meeting Special Earthquakes body.Meanwhile
Human factor is more, and seismic data longitudinal resolution is limited, and precision is generally below 20 meters, thus it is vertical on be difficult to divide it is single
Fan body of the thickness less than 20 meters can only portray roughly profile for stacked fan body of more phases time, and precision is lower.
Summary of the invention
The purpose of the present invention is to provide a kind of meticulous depiction methods of stacked fan body of more phases under sequence stratigraphic framework time, real
It is now to establish high-precision sequence stratigraphy framework, portrays sand body under the constraint inside screen work, overcoming conventional art can only
The problem of portraying fan body group.The range that fan body is portrayed is limited simultaneously, the precision that fan body is portrayed is improved, in high-resolution sequence framework
Inside determines that fan body develops boundary, portrays the hair of single fan body in conjunction with the earthquake on fan body boundary and the individual features of well-log information
Educate range.It is lower that the technology solves the problems, such as that current fan body portrays existing precision, achievees the purpose that improve and portrays precision.
The purpose of the invention is achieved by the following technical solution:
A kind of meticulous depiction method of stacked fan body of more phases time under sequence stratigraphic framework, comprising the following steps:
(a) work area sequence stratigraphy framework is established；
(b) feature of the fan body boundary on seismic profile is determined inside Stratigraphic framework；
(c) response characteristic of the fan body boundary on log is determined；
(d) the single fan body boundary of single phase time on each item comparison section is portrayed by seismic data and well-log information；
(e) backbone comparison section is established, step (b) is repeated to step (d), determines sandstone boundary point of each phase time, accurately
Portray secondary stacked fan body complex of more phases.
Above step mainly establishes high-precision sequence stratigraphic framework, limits the range for portraying fan body, improves
Fan body portrays precision, in combination with response characteristic of the fan body boundary in earthquake and well-log information, utilizes earthquake row resolution ratio
The high advantage of high advantage, well-log information vertical resolution, it is comprehensive to portray single fan body, fan body is improved on section and in plane
The precision of description.
The step (a) establish work area sequence stratigraphy framework the following steps are included:
(a1) inside seismic strata screen work, according to natural potential SP features of logging curve, derivation is carried out to SP curve values；
(a2) in the hope of first derivative be 0 and second dervative not equal to 0 point or first derivative positive and negative values transfer point
The maximum value or minimum value of indicative curve, wherein first derivative indicates maximum i.e. wave crest by just becoming negative, and first derivative is become by negative
It is positive to indicate minimum, that is, trough；Second dervative is 0 and point of three order derivatives not equal to 0 or the positive and negative transfer point of second dervative are made
For point of inflexion on a curve, sequence stratigraphy framework is constructed；Wherein second dervative is just indicating that interface location under certain layer, second order are led by negative change
Number indicates interface location on same layer by just becoming negative.
The step mainly first establishes seismic strata Sequence Stratigraphic Formation, and the screen work is lower by seismic data resolution limiting, and one
As differentiate formation thickness in 20m or more.Then under seismic strata screen work, well shake is combined, and establishes seismic time domain and well logging
Relationship between data Depth Domain is asked with well-log information in the advantage of vertical upper high resolution with spontaneous potential curve SP
The feature of reaction stratigraphic cycles is led to establish high-precision sequence stratigraphic framework.Sufficiently used compared with the existing technology earthquake and
The combination of well-log information, and the cycle of sedimentation is divided with the method for the automatic derivation of natural potential SP curve, it effectively raises
The precision that Stratigraphic framework is established.
The step (b) determines that feature of the fan body boundary on seismic profile includes following step inside Stratigraphic framework
It is rapid:
(b1) formation thickness is mutated, and lineups occur interrupted；
(b2) lineups are stacked, and amplitude enhances suddenly；
(b3) by comparison and lineups variation characteristic between well, the position of fan body abrupt changes in thickness is determined.
Determine that fan body boundary is mostly determined with seismic properties at present, but there are multi-solutions for seismic properties, and can only be flat
Face determines the range of a fan body group, which, in the individual features for determining fan body edge, is then spreaded to by section from section
Plane determines fan body boundary.
The step (c) determine response characteristic of the fan body boundary on log the following steps are included:
(c1) individual well sandstone thickness is portrayed by log, and is compared between progress well under sequence stratigraphic framework；
(c2) change point of sandstone thickness increased or decreased suddenly is determined.
The technology is under High Resolution Sequence Stratigraphic Framework, from the variation tendency for comparing determining sand body between well.It is complete in well pattern
Kind position, there is the pinching of sand body or thickness change and can then sentence 50% or more in (300m) within the scope of a well spacing between offset well
Break as fan body boundary, in the relatively large position of well spacing (being greater than 500m), the fan body boundary for selecting seismic data to determine.
The step (d) portrays the single fan body of single phase time on each item comparison section by seismic data and well-log information
Boundary includes the following steps；
(d1) individual well well point constrains；
(d2) seismic data interpolation arithmetic；
(d3) under the unified constraint of stratigraphic sequence pattern, the single fan body side of single phase time on each item comparison section is accurately portrayed
Boundary.
Under sequence stratigraphic framework, boundary is portrayed in conjunction with earthquake interpolation arithmetic with single well point, synthesis portrays fan body side
Boundary, the step overcome traditional limitation for being applied alone earthquake or well-log information to portray fan body, improve the essence that fan body is portrayed
Degree.
Compared with prior art, the present invention having the following advantages and benefits:
1 present invention is a kind of meticulous depiction method of stacked fan body of more phases time under sequence stratigraphic framework；
(1) present invention establishes High Resolution Sequence Stratigraphic Framework, improves the precision of sequence stratigraphic framework
The present invention first establishes seismic strata Sequence Stratigraphic Formation, and the screen work is lower by seismic data resolution limiting, general to differentiate
Formation thickness is in 20m or more.Then under seismic strata screen work, well shake is combined, and establishes seismic time domain and well-log information is deep
The relationship between domain is spent, with well-log information in the advantage of vertical upper high resolution, is reacted with spontaneous potential curve SP derivation
The feature of stratigraphic cycles establishes high-precision sequence stratigraphic framework.Earthquake and well logging money have sufficiently been used compared with the existing technology
The combination of material, and the cycle of sedimentation is divided with the method for the automatic derivation of natural potential SP curve, effectively raise stratum lattice
The precision that frame is established.
(2) since the vertical resolution of seismic data is limited, while sand body is not portrayed under sequence stratigraphic framework, to more
The fan body that phase time is overlapped mutually development cannot tell single fan body on vertical, can only portray a fan body group or one
The more set fan bodies of material resource development concentrate the boundary of development, and precision is lower.Seismic data longitudinal resolution is limited, and precision is generally below 20
Rice, thus it is vertical on be difficult to divide fan body of the single thickness less than 20 meters, more phases time stacked fan body can only be portrayed roughly
Profile, precision are lower.The advantages of present invention gives full play to the advantage of seismic data and well-log information, integrated use items data mentions
Height portrays the precision on fan body boundary, is increased to the rank for portraying single fan body.
Detailed description of the invention
Fig. 1 is that oil well SP stratigraphic cycles divide figure in the embodiment of the present invention；
Fig. 2 is that the stratum Lian Jing series of strata screen work establishes figure in the embodiment of the present invention；
Fig. 3 is each fan body boundary in the embodiment of the present invention in seismic cross-section；
Fig. 4 is that each fan body boundary response characteristic on seismic profile of the embodiment of the present invention determines fan body boundary graph；
Fig. 5 is that the embodiment of the present invention speculates the boundary figure of fan body boundary in the plane；
Fig. 6 is compared between well of the embodiment of the present invention determines fan body boundary and overlapping station diagram；
Fig. 7 is that the single fan body of completion of the embodiment of the present invention portrays schematic diagram；
Fig. 8 is that completion first phase fan body of the embodiment of the present invention portrays figure；
Fig. 9 is that completion second phase fan body of the embodiment of the present invention portrays figure；
Figure 10 is that completion third phase fan body of the embodiment of the present invention portrays figure；
Figure 11 is that completion fourth phase fan body of the embodiment of the present invention portrays figure；.
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail, and embodiments of the present invention are not limited thereto.
Embodiment
By taking one group of oil reservoir fan body in Kazakhstan oil field is portrayed as an example, according under a kind of sequence stratigraphic framework of the present invention
The meticulous depiction method of stacked fan body of more phases time successively implements the steps of:
(a1) inside seismic strata screen work, according to natural potential SP features of logging curve, derivation is carried out to SP curve values；
(a2) in the hope of first derivative be 0 and second dervative not equal to 0 point or first derivative positive and negative values transfer point
The maximum value or minimum value of indicative curve, wherein first derivative indicates maximum i.e. wave crest by just becoming negative, and first derivative is become by negative
It is positive to indicate minimum, that is, trough；Second dervative is 0 and point of three order derivatives not equal to 0 or the positive and negative transfer point of second dervative are made
For point of inflexion on a curve, sequence stratigraphy framework is constructed；Wherein second dervative is just indicating that interface location under certain layer, second order are led by negative change
Number indicates interface location on same layer by just becoming negative；With nutural potential logging curve SP, seismic data etc., single fan body is determined
Boundary and spatial distribution: the determination of datum level mid-term cycle is according to natural potential (SP) features of logging curve and to combine existing
Core column divide；Log is a kind of response forms of stratigraphic record, datum level rotation corresponding with subsequence boundary
The transfer point returned is characterized by flooding the conversion of mud stone and phase sequence form on stratigraphic record；Therefore in log
On, on the one hand subsequence boundary can be identified according to the low-resistivity of flooding mud stone, high natural gamma feature, on the other hand can also incite somebody to action
The conversion of log pattern is as reference frame；The transition form of log, for natural gamma, have significantly into
Product and moves back product at accretion；For natural potential, there is apparent sand shale transfer point.As shown in Figure 1, according to these features and rock
Further division has gone out the short-term cycle of datum level on the basis of sand shale is recorded in datum level mid-term cycle on stem, compares more mouthfuls
The cycle feature of well, the Sequence Stratigraphic Formation of the company's of foundation well, as shown in Figure 2；
(b) feature of the fan body boundary on seismic profile is determined inside Stratigraphic framework；(b1) formation thickness is mutated, same to phase
Axis occurs interrupted；(b2) lineups are stacked, and amplitude enhances suddenly；(b3) by comparison and lineups variation characteristic between well,
Determine the position of fan body abrupt changes in thickness.Fan body boundary: stratum is portrayed according to response characteristic of each fan body boundary on seismic profile
Abrupt changes in thickness, lineups occur interrupted；Lineups are stacked, and amplitude enhances suddenly.By being compared between well and lineups variation
Feature finds out the position of fan body abrupt changes in thickness；SPA sudden phase anomalies are as shown in Figure 4；In the plane by point and face supposition fan body boundary
Boundary is as shown in Figure 5.
(c) response characteristic of the fan body boundary on log is determined；(c1) individual well sandstone thickness is portrayed by log
Degree, and compared between progress well under sequence stratigraphic framework；(c2) change point of sandstone thickness increased or decreased suddenly is determined.Such as
Shown in Fig. 6, from the variation tendency for comparing determining sand body between well.At well pattern improvement position, between offset well within the scope of a well spacing
The pinching of sand body or thickness change, which occurs, in (300m) then can determine whether 50% or more as fan body boundary, in the relatively large portion of well spacing
Position (is greater than 500m), the fan body boundary for selecting seismic data to determine.
(d) the single fan body boundary of single phase time on each item comparison section is portrayed by seismic data and well-log information；Such as Fig. 7
It is shown, single fan body is completed by seismic data and well-log information and is portrayed；(d1) individual well well point constrains；(d2) seismic data interpolation
Operation；(d3) under the unified constraint of stratigraphic sequence pattern, the single fan body boundary of single phase time on each item comparison section is accurately portrayed.
(e) backbone comparison section is established, step (b) is repeated to step (d), determines sandstone boundary point of each phase time, accurately
Secondary stacked fan body complex of more phases is portrayed, as shown in Figs. 8 to 11.
The above is only presently preferred embodiments of the present invention, not does limitation in any form to the present invention, it is all according to
According to any simple modification to the above embodiments in technical spirit of the invention, equivalent variations, guarantor of the invention is each fallen within
Within the scope of shield.
Claims (1)
1. a kind of meticulous depiction method of stacked fan body of more phases time under sequence stratigraphic framework, it is characterised in that: the following steps are included:
(a) work area sequence stratigraphy framework is established；
(b) feature of the fan body boundary on seismic profile is determined inside Stratigraphic framework；
(c) response characteristic of the fan body boundary on log is determined；
(d) the single fan body boundary of single phase time on each item comparison section is portrayed by seismic data and well-log information；
(e) backbone comparison section is established, step (b) is repeated to step (d), determines sandstone boundary point of each phase time, accurately portray
The fan body complex that more phases time are stacked；
The step (b) determine feature of the fan body boundary on seismic profile inside Stratigraphic framework the following steps are included:
(b1) formation thickness is mutated, and lineups occur interrupted；
(b2) lineups are stacked, and amplitude enhances suddenly；
(b3) by comparison and lineups variation characteristic between well, the position of fan body abrupt changes in thickness is determined；
The step (c) determine response characteristic of the fan body boundary on log the following steps are included:
(c1) individual well sandstone thickness is portrayed by log, and is compared between progress well under sequence stratigraphic framework；
(c2) change point of sandstone thickness increased or decreased suddenly is determined；
The step (a) establish work area sequence stratigraphy framework the following steps are included:
(a1) inside seismic strata screen work, according to natural potential SP features of logging curve, derivation is carried out to SP curve values；
(a2) in the hope of first derivative be 0 and second dervative not equal to 0 point or first derivative positive and negative values transfer point instruction
The maximum value or minimum value of curve, wherein first derivative indicates maximum i.e. wave crest by just becoming negative, and first derivative becomes positive table by negative
Show minimum i.e. trough；Second dervative be 0 and point of three order derivatives not equal to 0 or the positive and negative transfer point of second dervative as bent
The inflection point of line, constructs sequence stratigraphy framework；Wherein second dervative is just indicating interface location under certain layer by negative change, second dervative by
It is positive to become interface location on negative expression same layer；
The step (d) portrays the single fan body boundary of single phase time on each item comparison section by seismic data and well-log information
Include the following steps；
(d1) individual well well point constrains；
(d2) seismic data interpolation arithmetic；
(d3) under the unified constraint of stratigraphic sequence pattern, the single fan body boundary of single phase time on each item comparison section is accurately portrayed.
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| CN107870369A (en) * | 2016-09-26 | 2018-04-03 | 中国石油化工股份有限公司 | A kind of non-structural configuration trap identification method and system |
| CN106990449B (en) * | 2017-04-20 | 2019-12-17 | 中国地质大学（武汉） | A Representation Method for Constructing Continental Sequence Stratigraphic Framework Based on Multidimensional Data |
| CN107065034B (en) * | 2017-06-07 | 2018-11-27 | 中海石油(中国)有限公司 | Division methods whens a kind of fluvial facies stratum etc. based on depth displacement |
| CN108008466B (en) * | 2017-11-07 | 2019-06-11 | 中国石油天然气股份有限公司 | Composite river sedimentation period subspace analysis method based on sand-land ratio |
| CN110727027B (en) * | 2018-07-17 | 2021-11-02 | 中国石油天然气股份有限公司 | Fine carving method for multi-period river sand |
| CN110068859A (en) * | 2019-04-12 | 2019-07-30 | 中国石油大学(华东) | A kind of horizontal well region braid deltas seismic reservoir sedimentology quantitatively characterizing method |
| CN111175819B (en) * | 2020-01-06 | 2022-02-18 | 中国石油化工股份有限公司 | Gravel rock sector sedimentary facies belt fine dividing method based on well-seismic multi-stage constraint |
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