CN105626053B - The method that fracture belt carries out fracture belt research is drilled through by core hole - Google Patents
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Abstract
The present invention provides a kind of method for drilling through fracture belt development fracture belt research by core hole, this method comprises: the method combined using Log Strata comparison and seismic interpretation, primarily determines core hole fracture belt depth；According to the needs of research fracture belt, core hole target spot plan-position is designed；According to fracture belt width range on tectonic characteristic and the fault properties, turn-off, fracture belt upper lower burrs lithology prediction well track, to design determining cored interval；Drilling and coring delivery splits the variation with depth, and in due course, appropriateness adjustment cored interval according to real brill data analytical judgment, to guarantee the integrality of fracture belt coring；And using the rock core information obtained, carry out fracture band structure, closure these associated series of studies.The researchs such as this method is fault zone sealing, seismic interpretation, well logging quantitative judge provide new foundation, are conducive to increase the new knowledge to faults control oil-gas reservoir and the oil-gas reservoir complicated by tomography.
Description
Technical field
The present invention relates to fracture belt research field, especially relating to one kind, by core hole to drill through fracture belt disconnected to carry out
Split band structure, closure and its method to researchs such as remaining oil control actions.
Background technique
Complicated Fault-Block Hydrocarbon Reservoir is important one of the Oil-gas Accumulation Types in China.In the second elephant of China --- Shengli Oil Field
In, about 1,000,000,000 tons of the crude oil proved reserves of Complicated Fault-Block Hydrocarbon Reservoir account for 1/5 or more of entire Shengli Oil Field.Complex fault block oil gas
It is complicated to hide geological structure, tomography is closely developed and mutually cutting, and tomography, which is dredged, complicates oil water relation with closure, this is to multiple
The exploration and development of miscellaneous fault block oil and gas pool brings many particularity and complexity.Therefore carry out fracture belt knot for fault block oil and gas pool
The research of structure, closure to the advantageous exploration region of determination, evaluates the portion of the validity of trap, control reserve, well pattern
Administration, the determination of development scheme, the calculating of recovery ratio, the appraising and deciding of mining-employed reserves, research of Remaining Oil Distribution etc. have important
Meaning.Previous research mostly uses the indirect research methods such as outcrop observation, earthquake prediction, log analysis, these sides
Method is easier to obtain because of data, and the research method generallyd use both at home and abroad at present.But by field section exposure condition etc.
Limitation, in terms of the document collected, the fracture belt that can be observed at present appear it is in the majority with Paleozoic and Mesozoic Period stratum, I
The similar outcrop fracture belt of prevailing river, delta facies sand-mudstone formation condition studies phase in state's Continental Reservoir
To less.In addition, the fracture belt that outcrop observes, by the earth's surface exposure of long period, temperature, pressure etc. also be experienced
The change of long period causes fracture band structure etc. that can have a degree of difference with underground fracture band, and research relies primarily on
The similitude for speculating it and appearing is difficult the fault zone interior structure for truly recognizing practically to descend under geological conditions completely and property
Matter also can not directly carry out fault zone sealing, to the relevant quantitative study such as hydrocarbon control action.The earth such as earthquake, well logging
Physical method is limited to the influence such as resolution ratio, and along with geology has the reasons such as multi-solution, the description of these methods is broken with characterization
Accuracy with internal structure and property is also subject to certain restrictions.
Previous method is indirect method, and disturbing factor is more, lacks intuitive, accuracy.We have invented a kind of new thus
By core hole drill through fracture belt carry out fracture belt research method, solve the above technical problem.
Summary of the invention
The object of the present invention is to provide one kind to drill through fracture belt by core hole, directly acquires the first-hand of underground fracture band
Data carries out fracture band structure, property and its research method to remaining oil control action etc., and passes through core description, divides
The method that the means such as analysis chemical examination carry out a series of researchs relevant to fracture belt.
The purpose of the present invention can be achieved by the following technical measures: being drilled through fracture belt development fracture belt by core hole and ground
The method studied carefully, it includes: step 1 that fracture belt should be drilled through by core hole to carry out the method for fracture belt research, utilizes Log Strata pair
Method than combining with seismic interpretation primarily determines core hole fracture belt depth；Step 2, according to research fracture belt needs,
Design core hole target spot plan-position；Step 3, according to tectonic characteristic and the fault properties, turn-off, fracture belt upper lower burrs
Fracture belt width range on lithology prediction well track, to design determining cored interval；Step 4, drilling and coring delivery bores number according to real
The variation with depth is split according to analyzing and determining, and in due course, appropriateness adjustment cored interval, to guarantee the integrality of fracture belt coring；With
And step 5 carries out fracture band structure, closure these associated series of studies using the rock core information of acquisition.
The purpose of the present invention can be also achieved by the following technical measures:
In step 1, carry out offset well log Strata Comparison in coring wellblock, it is accurate to obtain each well around core hole
Breakpoint and turn-off data；Pass through horizon calibration, the work of seismic profile integrated interpretation；The method combined using well shake, it is preliminary true
Determine core hole fracture belt depth.
In step 2, it selects the old well nearest apart from core hole as Reference well, designs the opposite ginseng of core hole target position
Orientation, distance according to well.
In step 4, during drilling and coring delivery, according to sieve residue log, drilling time curve, the tracking of these data of gas logging curve
It checks drilling situation, the prediction of comprehensive descision reference lamina and the real difference for boring situation, judges whether fracture belt depth changes, and
Shi Shidu is raised or is moved down cored interval, to guarantee the integrality of fracture belt coring.
In steps of 5, to the fracture belt rock core of taking-up, carrying out as needed includes that fracture band structure core observation describes one
Serial system is researched and analysed, be fracture belt quantitative judge, fracture belt forward model, fault zone sealing quantitative study these into
One step research provides necessary parameter.
In steps of 5, the research of development include: the summary of fracture belt tactic pattern, fracture belt lithology thin section identification, mineral at
Point analysis, Electronic Speculum observe these petrophysical property experimental analyses, gas both horizontally and vertically is surveyed and water survey permeability these
Seepage flow characteristics experimental analysis, adsorbed hydrocarbons changes of contents, package these formation chemistry experimental analyses of volume property, Rock resistivity in rock
These Rock Mechanics Tests of rate, velocity of longitudinal wave, shear wave velocity, Poisson's ratio.
The method that fracture belt carries out fracture belt research is drilled through by core hole in the present invention, fracture is drilled through by core hole
Band directly carries out the method for the researchs such as fracture band structure, property, solves the problems in previous methods.This method is obtained
Systematization, quantification core analysis parameter be that means of other research fracture belts indirectly can not obtain, while coring institute
The data of the first-hand preciousness of the underground true core of acquisition can provide the number of Quantitative study for other indirect research methods
According to foundation, progress rock core calibration etc..Furthermore, it is contemplated that the problem of economic cost and benefit, the selection of fracture belt core hole can be with
Utilize the sealed coring well or reservoir evaluation well that can bore chance fracture belt.These core holes are typically all to solve oil field urgently
The remaining oil problem of perception of need, needs or reservoir evaluation stage reserves in order to meet high water-cut stage fault-block oilfield fine development
The problem of perception of scale etc., itself is all the well for needing coring, and it is disconnected that design a part is only taken into account in coring purpose and well section
Band cored interval is split, therefore is all both economical from drilling and coring delivery and fracture belt research cost.This method both solved
Quantitative, visual understanding fracture band structure, property and its to a series of pairs of fault block oil such as the control action of Remaining Oil Distribution
Gas field development has the problem of great influence, and both economical feasible, is a kind of research method with practical significance.
Detailed description of the invention
Fig. 1 is the flow chart that fracture belt coring organon of the present invention is applied to a specific embodiment；
Fig. 2 is seismic profile integrated interpretation figure in a specific embodiment of the invention；
Fig. 3 is the well site deployment figure in a specific embodiment of the invention；
Fig. 4 is core hole and offset well log Strata Comparison figure in a specific embodiment of the invention；
Fig. 5 is the fracture belt tactic pattern figure in a specific embodiment of the invention；
Fig. 6 is that the brill in a specific embodiment of the invention meets core hole well log interpretation complex chart；
Fig. 7 is for fault zone sealing in a tool examples of implementation of the invention and to the well of taping the latent power after hydrocarbon control action understanding
Position deployment imaginary picture of primitive people.
Specific embodiment
To enable above and other objects, features and advantages of the invention to be clearer and more comprehensible, preferably implementation is cited below particularly out
Example, and cooperate institute's accompanying drawings, it is described in detail below.
As shown in FIG. 1, FIG. 1 is the flow charts that fracture belt coring organon of the present invention is applied to a specific embodiment.
In step 101, the method combined using Log Strata comparison and seismic interpretation primarily determines core hole fracture belt
Depth.Carry out offset well log Strata Comparison in coring wellblock, obtains the accurate breakpoint of each well and turn-off around core hole
Data；Pass through horizon calibration, the work of seismic profile integrated interpretation；The method (Fig. 2) combined using well shake, primarily determines core hole
Fracture belt depth.Fig. 2 is the East and West direction seismic profile integrated interpretation figure in a specific embodiment of the invention, can be in figure
Find out, in conjunction with the achievement of Strata Comparison, explained by horizon calibration, tracking, primarily determined target fault breakpoint depth and
Fracture belt cored interval range.Process enters step 102.
It is designed core hole target spot plan-position (Fig. 3) in step 102 according to the needs of research fracture belt.Selection distance takes
The nearest old well of heart well designs orientation, distance etc. of the core hole target position with respect to Reference well as Reference well.Fig. 3 is this hair
Well site deployment figure in a bright specific embodiment, it can be seen in the drawing that core hole is designed as inclined shaft, and has determined well head
And fracture belt top A target spot and oil reservoir bottom B target position, the horizontal displacement of well head to B target spot are 330m.Process enters step
103。
In step 103, predicted according to tectonic characteristic and the fault properties, turn-off, fracture belt upper lower burrs lithology etc.
Fracture belt width range on well track, to design determining cored interval.The property of analyzed area construction feature and target fault
Matter, the size of turn-off, the opposed situation of fracture belt upper lower burrs lithology, fracture belt width range on pre- track of logging well, and then accurately set
It counts and determines cored interval.Fig. 4 is to bore core hole Strata Comparison sectional view in fact in a specific embodiment of the invention, can from figure
To find out, core hole smoothly bores near 1941m according to design and meets fracture belt, cored interval 38.3m.Process enters step
104。
In step 104, drilling and coring delivery splits the variation with depth, and in due course, appropriateness adjustment according to real brill data analytical judgment
Cored interval, to guarantee the integrality of fracture belt coring.During drilling and coring delivery, surveyed according to sieve residue log, drilling time curve, gas
Drilling situation, the prediction of comprehensive descision reference lamina and the real difference for boring situation are checked in the tracking of the data such as curve, judge fracture belt depth
Whether change, appropriateness raises or move down cored interval in time, to guarantee the integrality of fracture belt coring.Process enters step
Rapid 105.
Carry out the associated series such as fracture band structure, closure using the rock core information of acquisition in step 105 and grind
Study carefully.To the fracture belt rock core of taking-up, can according to need development includes a series of systems such as fracture band structure core observation description
Research and analyse, for fracture belt quantitative judge, fracture belt forward model, fault zone sealing quantitative study etc., further research is mentioned
For necessary parameter.For example, can carry out includes: that fracture belt tactic pattern summarizes (Fig. 5), fracture belt lithology thin section identification, mine
The petrophysical properties experimental analyses such as object constituent analysis, Electronic Speculum observation, gas both horizontally and vertically is surveyed and water surveys permeability etc.
Seepage flow characteristics experimental analysis, the formation chemistries experimental analysis such as adsorbed hydrocarbons changes of contents, package volume property, Rock resistivity in rock
Rock Mechanics Tests such as rate, velocity of longitudinal wave, shear wave velocity, Poisson's ratio etc..
Fig. 5 is to demarcate log according to fracture belt core description, using rock core in a specific embodiment of the invention
After carrying out fracture belt quantitative judge, the fracture belt tactic pattern figure taken out is summarized.
It is essentially symmetrical structure: fracture belt fills bandwidth about 2.6m, and core part develops thickness about 0.35m grey matter glue
Fine and close fault breccia to be tied, has a crannied celadon tomography mud stone to two sides development, width is respectively 0.9m, 1.35m, then
It is outward the induced fractures band for the normal rock for being influenced to generate by tomography, fracture belt downthrow block S_1 Formation canescence grey matter mud stone lures
Crack bandwidth about 21.5m, fracture belt upthrow shaerbuer mountain reservoir induced fractures bandwidth about 20.6m are led, in mud stone and sandstone
It can be seen that with the presence of induced fractures, but it is substantially reduced than fracture development density in fracture belt core part tomography mud stone.
Fig. 6 is the fracture belt core hole well log curve integrated interpretation figure, it can be seen that reservoir is remaining below the well fracture belt
Oil is more enriched with.On the basis of this is the core analysis to fracture belt rock core closure, in conjunction with block dynamic and static data, judge
Conclusion out: the fracture belt is closed, and clearly to fracture belt upthrow shaerbuer mountain reservoir remaining oil control action.It is disconnected
The neighbouring core hole of band is split, bores and meets oil reservoir 18.7m/7 layers, 30.8m/7 layers of Water Flooding Layer, operation also achieves preferable exploitation effect
Fruit.At place, each substratum recovery percent of reserves of block has reached 34.5-54.8%, and surrounding producing well individual well is averaged day oil-producing 2t/d, aqueous
In the case where 96%, which only penetrates out thin layer 1.6m/2 layers of the 2 Ge Fei main force on March 10th, 2014, obtains daily output 15t/d, aqueous
50%, add up 381 tons of oil-producing at present.
Fig. 7 is for fault zone sealing in a specific embodiment of the invention and to taping the latent power after hydrocarbon control action understanding
Well site deployment figure.According to the research achievement combination block dynamic and static data etc. of core hole, the tomography has been implemented again in the plane
Position, carried out fault zone sealing and its research to shaerbuer mountain reservoir Controlling oil effect, shown that take liter disk attached for fracture
The important understanding that remaining oil is enriched with very much within the scope of nearly 50m, the big angle of parallel fracture belt can nearby be disposed by proposing fracture belt
Inclined shaft --- the suggestion of the clever further Remaining Oil of well is spent, is established for such further fine development of High water cut fault block oil reservoir
Theoretical and material base has also further demonstrated that the importance and advance of the invention of fracture belt research.
The method that fracture belt carries out fracture belt research is drilled through by core hole in the present invention, is for developing geological research
Middle fracture band structure, a kind of method for closing Journal of Sex Research, it is scantily lower disconnected for the research of current Complicated Fault-Block Hydrocarbon Reservoir fracture belt
The practical rock core information for splitting band relies primarily on the observation of ground outcrop, utilizes the data speculations fracture belt knot such as earthquake and well logging
The problem of indirect means such as structure, has been put forward for the first time and has directly drilled through fracture belt with drilling and coring delivery technology and carry out Study of The Underground fracture belt knot
The method of structure and property.This method directly drills through fracture belt by way of drilling and coring delivery, carries out fracture band structure, rock object
A series of researchs such as rationality matter, closure, to establish the new method of fracture belt research.Fracture belt coring in the present invention is ground
Study carefully method to primarily determine fracture belt approximate range by Strata Comparison, well shake combination technology, and directly bore using drilling and coring delivery technology
Take fracture belt, so carry out fracture band structure, petrophysical property, closure, to a series of researchs such as remaining oil control action,
To establish the new method of fracture belt research.With the indirect methods phase such as previous outcrop observation, earthquake prediction, log analysis
Than this method can directly carry out core description and core analysis chemical examination including underground actual crack band structure etc., so more
It is intuitive, truer；Meanwhile the core analysis parameter of systematization, quantification is other method institute nothings for studying fracture belt indirectly
What method obtained, therefore this method is that solid geological foundation has been established in the true fracture belt research in stratum, is fault zone sealing, disconnected
Split and provide new foundation with researchs such as earthquake, well log interpretation and quantitative judges, be conducive to increase to faults control oil-gas reservoir with
And the new knowledge of the oil-gas reservoir complicated by tomography.
Claims (6)
1. drilling through the method that fracture belt carries out fracture belt research by core hole, which is characterized in that should be drilled through by core hole disconnected
It splits and includes: with the method for carrying out fracture belt research
Step 1, the method combined using Log Strata comparison and seismic interpretation, primarily determines core hole fracture belt depth；
Step 2, according to the needs of research fracture belt, core hole target spot plan-position is designed；
Step 3, it is broken on track according to tectonic characteristic and fault properties, turn-off, fracture belt upper lower burrs lithology prediction well
Bandwidth range, to design determining cored interval；
Step 4, drilling and coring delivery splits the variation with depth, and in due course, appropriateness adjustment core hole according to real brill data analytical judgment
Section, to guarantee the integrality of fracture belt coring；And
Step 5, using the rock core information of acquisition, carry out fracture band structure, the relevant series of studies of closure.
2. according to claim 1 drill through the method that fracture belt carries out fracture belt research by core hole, which is characterized in that
In step 1, carry out offset well log Strata Comparison in coring wellblock, obtain around core hole the accurate breakpoint of each well and
Turn-off data；Pass through horizon calibration, the work of seismic profile integrated interpretation；The method combined using well shake, primarily determines core hole
Fracture belt depth.
3. according to claim 1 drill through the method that fracture belt carries out fracture belt research by core hole, which is characterized in that
In step 2, it selects the old well nearest apart from core hole as Reference well, designs side of the core hole target position with respect to Reference well
Position, distance.
4. according to claim 1 drill through the method that fracture belt carries out fracture belt research by core hole, which is characterized in that
In step 4, during drilling and coring delivery, drilling feelings are checked according to sieve residue log, drilling time curve, the tracking of gas logging curve data
Condition, the prediction of comprehensive descision reference lamina and the real difference for boring situation, judge whether fracture belt depth changes, in time appropriateness up-regulation
Or cored interval is moved down, to guarantee the integrality of fracture belt coring.
5. according to claim 1 drill through the method that fracture belt carries out fracture belt research by core hole, which is characterized in that
In steps of 5, to the fracture belt rock core of taking-up, carrying out as needed includes that fracture band structure core observation describes a series of systems
Research and analyse, provide necessary ginseng for fracture belt quantitative judge, fracture belt forward model, fault zone sealing quantitative study
Number.
6. according to claim 5 drill through the method that fracture belt carries out fracture belt research by core hole, which is characterized in that
In steps of 5, the research of development includes: petrophysical property experimental analysis, seepage flow characteristics experimental analysis, formation chemistry experiment point
Analysis, Rock Mechanics Test；The petrophysical property experimental analysis includes the summary of fracture belt tactic pattern, fracture belt lithology thin slice
Identification, mineralogical composition analysis, Electronic Speculum observation；The seepage flow characteristics experimental analysis includes gas survey and water survey both horizontally and vertically
Permeability；The formation chemistry experimental analysis includes adsorbed hydrocarbons changes of contents in rock, package volume property；The rock mechanics is real
It tests including rock resistivity, velocity of longitudinal wave, shear wave velocity, Poisson's ratio.
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| CN105626053A (en) | 2016-06-01 |
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