CN110414085A - It has developed fault block oil reservoir original oil-water level and has determined method - Google Patents
It has developed fault block oil reservoir original oil-water level and has determined method Download PDFInfo
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- CN110414085A CN110414085A CN201910618258.0A CN201910618258A CN110414085A CN 110414085 A CN110414085 A CN 110414085A CN 201910618258 A CN201910618258 A CN 201910618258A CN 110414085 A CN110414085 A CN 110414085A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
- G06T17/05—Geographic models
Abstract
The present invention provide it is a kind of developed fault block oil reservoir original oil-water level and determine method, this has been developed fault block oil reservoir original oil-water level and has determined that method includes: step 1, and geological model of oil accumulation modeling is carried out；Step 2, on the basis of geological model of oil accumulation models, geological model of oil accumulation evaluation is carried out；Step 3, on the basis of geological research, a series of initial oil-water interfaces are estimated；Step 4, reservoir numerical simulation forward modeling and matching are carried out；Step 5, oil-water interfaces and reserves are determined.This has been developed fault block oil reservoir original oil-water level and has determined method, determines the uncertain strong problem of method for conventional oil-water interfaces, regard oil well actual production dynamic as evaluation criterion, improves the reliability of estimation oil-water interfaces.
Description
Technical field
The present invention relates to oil reservoir development technical fields, especially relate to one kind and have developed fault block oil reservoir original oil-water level
Determine method.
Background technique
Fault block oil reservoir is one of domestic non-marine reservoir main Types, and oil-water interfaces are the important parameter that reserves calculate, grease
The determination at interface is typically all that the oily bottom for passing through drilling well and water top determine.But in oil reservoir discovery and development process, due to ground
The uncertainty of matter understanding, in order to guarantee the economic benefit of development well, the principle for accounting for high point is all taken in the deployment of general development well,
So it is difficult to ensure that the oily bottom and water top of drilling well are exactly real original oil-water level, therefore can only be by speculating.This oil
Reserves caused by the uncertainty of water termination are inaccurate, bring problem for the dynamic analysis in development process, many is with reserves
The development index of parameter leads to not to make the potentiality to be exploited and development level of oil reservoir correct assessment and pre- different from normal value
It surveys.
In order to determine potentiality of remaining oil and the distribution of having developed fault block, it is necessary to correct assessment and the geology storage for determining oil reservoir
Amount.In oil reservoir discovery and development process, due to the uncertainty of geological knowledge, in order to guarantee the economic benefit of development well, one
As the deployment of development well all take the principle for accounting for high point, during reserves calculate, the determination of oil-water interfaces is typically all to pass through
The oily bottom of drilling well and water top determine that, since well is close to structural high part, oily bottom and water top (see Fig. 2) are clearly not oil reservoir reality
Border oil-water interfaces, the oil in place calculated using the oil-water interfaces, which carries out analysis to development behavior, and research is will appear significantly
Sound state contradiction leads to not correctly assess the potentiality of oil reservoir.Therefore, it provides correct assessment and calculates initial reserves
Method be the key of solving the problem, and initial reserves construct determine under the premise of, mainly how to determine original oil
Water termination.
We have invented a kind of new fault block oil reservoir original oil-water levels of exploitation to determine method thus, solves the above skill
Art problem.
Summary of the invention
The object of the present invention is to provide a kind of fault block oil reservoir original oil-water level of exploitation determination sides based on Production development
Method.
The purpose of the present invention can be achieved by the following technical measures: develop fault block oil reservoir original oil-water level determination side
Method, this has been developed fault block oil reservoir original oil-water level and has determined that method includes: step 1, carries out geological model of oil accumulation modeling；Step 2,
On the basis of geological model of oil accumulation modeling, geological model of oil accumulation evaluation is carried out；Step 3, on the basis of geological research, estimation one
The initial oil-water interfaces of series；Step 4, reservoir numerical simulation forward modeling and matching are carried out；Step 5, oil-water interfaces and reserves are determined.
The purpose of the present invention can be also achieved by the following technical measures:
In step 1, it using block earthquake, drilling well, well logging, well logging, coring and analytical test data, is finely retouched in oil reservoir
On the basis of stating, oil reservoir three-dimensional geological model is established.
In step 2, static data is moved using oil reservoir development, geological model of oil accumulation static data is evaluated, to protect
The certainty of geological model of oil accumulation is demonstrate,proved, caused by guaranteeing the uncertainty that oil reservoir sound state contradiction is not due to construction and reservoir.
In step 2, the evaluation carried out to geological model of oil accumulation static data includes fracture system, construction height and reservoir
Distribution.
Initial oil-water interfaces estimation described in step 3 sequentially includes the following steps:
(a) on the basis of geological research, chance oil reservoir situation is bored according to drilling well and is classified to fault block has been developed, brill is divided into
It meets water layer and does not bore and meet two kinds of situations of water layer；
(b) it is directed to the development block for not boring and meeting and being able to reflect the original reservoir state water layer, selection is able to reflect the original reservoir
The brill of state meets the well of oil reservoir construction extreme lower position, and oily bottom construction depth is H1, choose and be able to reflect the original reservoir state
The well for meeting water layer construction extreme higher position is bored, water top construction depth is H2；A series of initial oil hydrospheres are estimated using following formula
Face:
Hwoc=H1+|H1-H2|/N (formula 1)
Wherein, HwocFor the initial oil water interface level of estimation, N is the initial oil-water interfaces item number of estimation.
(c) it is directed to the development block for not boring and meeting and being able to reflect the original reservoir state water layer, selection is able to reflect the original reservoir
The brill of state meets the well of oil reservoir construction extreme lower position, and oily bottom construction depth is H1.It is a series of initial using following formula estimation
Oil-water interfaces:
Wherein, D has developed fault block and has been averaged well spacing, and θ is oil reservoir inclination angle.
In step 4, using reservoir model-building and reservoir numerical simulation integrated technique, on the basis of geological model of oil accumulation,
A series of oil-water interfaces estimated using step 3 is foundations, exploitation dynamic data, carry out to different oil-water interfaces reservoir models
Reservoir numerical simulation forward modeling.
In steps of 5, it is analyzed using the forward modeling under different oil-water interfaces as a result, i.e. aqueous under oil reservoir difference oil-water interfaces
Rate curve is compared with actual plot of water cut, and obtains accurate oil-water interfaces by the loop iteration of following steps:
If (a) fw(Hn)-fwh< ε, n=1 ... N, then Hwoc=Hn(formula 3)
Wherein, fw(Hn) be nth oil-water interfaces simulation moisture content, fwhFor practical moisture content, ε is that the maximum allowed is missed
Difference.
If (b) fw(Hn)-fwh> ε, n=1 ... N
The smallest two oil-water interfaces of the positive negative error of moisture content are then chosen, are enabled:
Wherein, H 'wocFor the new oil-water interfaces estimation after the smallest two oil-water interfaces fitting of the application positive negative error of moisture content
Value, HnAnd Hn+1For the smallest two oil-water interfaces height of the positive negative error of moisture content, εnAnd εn+1For nth and (n+1)th grease circle
Moisture content error of fitting under face.
(c) forward simulation is carried out using the oil-water interfaces that formula (4) calculate, circulation step (a)-(c) is aqueous until simulating
Reach in error range of operation with practical aqueous error；
The oil-water interfaces of forward modeling result and the most identical forward model of real data are oil reservoir reality i.e. most probable
Oil-water interfaces, the oil in place under the oil-water interfaces is that oil reservoir is most objective or accurate oil in place.
In the oil reservoir development stage, due to the accumulation of data and the increase of well spacing density, the static geological knowledge of fault block oil reservoir
Or geological model of oil accumulation is clearer, the fault block oil reservoir original oil-water level of exploitation in the present invention determines method, in the mould
On the basis of type, responded using a large amount of development behavior data, that is, oil reservoir static state development behavior, to different oil-water interfaces and reserves
Under development behavior response, using Research Numerical Simulation Techique carry out forward modeling, until forward modeling result and oil reservoir actual development dynamic
Until response coincide, oil-water interfaces at this time are the original oil-water level of oil reservoir, the reservoir geology determined with this oil-water interfaces
Reserves are the original oil in place of oil reservoir.
This has been developed fault block oil reservoir original oil-water level and has determined method, overcomes oil-water interfaces that conventional method is estimated not
The strong problem of certainty, based on determining method by conventional geology oil-water interfaces, using digital-analog integrated technology is modeled, with reality
Production development is test stone, by the way that simulation dynamic and practical dynamic error analysis, iteration realizes original oil-water level
Accurate playback.
Detailed description of the invention
Fig. 1 is the process developed fault block oil reservoir original oil-water level and determined a specific embodiment of method of the invention
Figure；
Fig. 2 is that fault block oil-water interfaces analyze schematic diagram；
Fig. 3 is the forward modeling result figure of conceptual model difference oil-water interfaces；
Fig. 4 is dynamic analog authentication front and back oil-water interface position schematic diagram in a specific embodiment of the invention；
Under the conditions of Fig. 5 is oil-water interfaces before dynamic analog authentication in a specific embodiment of the invention, simulation moisture content is bent
Line and practical plot of water cut comparison diagram；
Under the conditions of Fig. 6 is oil-water interfaces after dynamic analog authentication in a specific embodiment of the invention, simulation moisture content is bent
Line and practical plot of water cut comparison diagram.
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 shown in attached drawing, it is described in detail below.
As shown in FIG. 1, FIG. 1 is the flow charts developed fault block oil reservoir original oil-water level and determined method of the invention.
Step 101, geological model of oil accumulation models.It is provided using block earthquake, drilling well, well logging, well logging, coring and analytical test
Material, on the basis of Reservoir Description, establishes oil reservoir three-dimensional geological model.
Step 102, geological model of oil accumulation is evaluated.Static data is moved first with oil reservoir development, it is quiet to geological model of oil accumulation
State data are evaluated, including fracture system, construction height and reservoir distribution etc., to guarantee the certainty of geological model of oil accumulation,
Caused by guaranteeing the uncertainty that oil reservoir sound state contradiction is not due to construction and reservoir；
Step 103, initial oil-water interfaces estimation.It bores chance oil reservoir situation according to the block first to be sorted out, fault block oil
Layer, which bores, meets water layer, estimates a series of initial oil-water interfaces using following formula 1.
(a) on the basis of geological research, chance oil reservoir situation is bored according to drilling well and is classified to fault block has been developed, brill is divided into
It meets water layer and does not bore and meet two kinds of situations of water layer；
(b) it is directed to the development block for not boring and meeting and being able to reflect the original reservoir state water layer, selection is able to reflect the original reservoir
The brill of state meets the well of oil reservoir construction extreme lower position, and oily bottom construction depth is H1, choose and be able to reflect the original reservoir state
The well for meeting water layer construction extreme higher position is bored, water top construction depth is H2.A series of initial oil hydrospheres are estimated using following formula
Face:
Hwoc=H1+|H1-H2|/N (formula 1)
Wherein, HwocFor the initial oil water interface level of estimation, N is the initial oil-water interfaces item number of estimation.
(c) it is directed to the development block for not boring and meeting and being able to reflect the original reservoir state water layer, selection is able to reflect the original reservoir
The brill of state meets the well of oil reservoir construction extreme lower position, and oily bottom construction depth is H1.It is a series of initial using following formula estimation
Oil-water interfaces:
Wherein, D has developed fault block and has been averaged well spacing, and θ is oil reservoir inclination angle.
Step 104, reservoir numerical simulation forward modeling and matching.Using reservoir model-building and reservoir numerical simulation integrated technique,
On the basis of geological model of oil accumulation, it is different to give oil reservoir as foundation in a model for a series of oil-water interfaces estimated using step 103
Oil-water interfaces, exploitation dynamic data carry out reservoir numerical simulation forward modeling to different oil-water interfaces reservoir models.
Step 105, oil-water interfaces and reserves determine.Using the forward modeling analysis under different oil-water interfaces as a result, i.e. oil reservoir is not
With the plot of water cut under oil-water interfaces, the loop iteration for being compared with actual plot of water cut, and passing through following steps
Obtain accurate oil-water interfaces:
If (a) fw(Hn)-fwh< ε, n=1 ... N, then Hwoc=Hn(formula 3)
Wherein, fw(Hn) be nth oil-water interfaces simulation moisture content, fwhFor practical moisture content, ε is that the maximum allowed is missed
Difference.
If (b) fw(Hn)-fwh> ε, n=1 ... N
The smallest two oil-water interfaces of the positive negative error of moisture content are then chosen, are enabled:
Wherein, H 'wocFor the new oil-water interfaces estimation after the smallest two oil-water interfaces fitting of the application positive negative error of moisture content
Value, HnAnd Hn+1For the smallest two oil-water interfaces height of the positive negative error of moisture content, εnAnd εn+1For nth and (n+1)th grease circle
Moisture content error of fitting under face.
(c) forward simulation is carried out using the oil-water interfaces that formula (4) calculate, circulation step (a)-(c) is aqueous until simulating
Reach in error range of operation with practical aqueous error.
The oil-water interfaces of forward modeling result and the most identical forward model of real data are oil reservoir reality i.e. most probable
Oil-water interfaces, the oil in place under the oil-water interfaces is that oil reservoir is most objective or accurate oil in place.
The following are apply a specific embodiment of the invention:
L fault block has determined its oil reservoir structure after explaining using well-log information fine correlation and high accuracy surface modelling Information integration
It makes and reservoir parameter is responded on the basis of reservoir model-building using a large amount of development behavior data, that is, oil reservoir static state development behavior,
To the development behavior response under different oil-water interfaces and reserves, forward modeling is carried out using Research Numerical Simulation Techique, until forward modeling knot
Until fruit and oil reservoir actual development dynamic response coincide, oil-water interfaces at this time are the original oil-water level of oil reservoir, with this oil
The reservoir geology reserves that water termination determines are the original oil in place of oil reservoir.
1. oil reservoir three-dimensional geological modeling
On Stratigraphic Division And Correlation and high accuracy surface modelling basis for interpretation, construction is successively established using reservoir model-building software
Model, Reservoir Distribution model and reservoir properties model.And Quality Control is carried out to model, guarantee model quality and different data in three-dimensional
Consistency spatially.
2. reservoir numerical simulation
On the basis of reservoir model, different oil-water interfaces progress numerical reservoir moulds are set using digital-analog integrated technology is modeled
Quasi- forward modeling, and arrange and record the recovery percent of reserves and aqueous changing rule (Fig. 3-Fig. 6) of each oil-water interfaces model.
3. oil-water interfaces are determining and reserves calculate
All project to the above results and oil reservoir development are actually aqueous on scatter plot with recovery percent of reserves, find forward modeling result with
Real data most identical (Fig. 6), the oil-water interfaces of the model are that oil reservoir is most objective or close to actual original oil-water level,
Its oil in place is oil reservoir most probable oil in place.
Claims (7)
1. having developed fault block oil reservoir original oil-water level determines method, which is characterized in that this has developed the original grease of fault block oil reservoir
Interface determines that method includes:
Step 1, geological model of oil accumulation modeling is carried out；
Step 2, on the basis of geological model of oil accumulation models, geological model of oil accumulation evaluation is carried out；
Step 3, initial oil-water interfaces estimation is carried out；
Step 4, reservoir numerical simulation forward modeling and matching are carried out；
Step 5, oil-water interfaces and reserves are determined.
2. fault block oil reservoir original oil-water level according to claim 1 of having developed determines method, which is characterized in that in step
In 1, using block earthquake, drilling well, well logging, well logging, coring and analytical test data, on the basis of Reservoir Description, establish
Oil reservoir three-dimensional geological model.
3. fault block oil reservoir original oil-water level according to claim 1 of having developed determines method, which is characterized in that in step
In 2, static data is moved using oil reservoir development, geological model of oil accumulation static data is evaluated, to guarantee geological model of oil accumulation
Certainty, guarantee oil reservoir sound state contradiction be not due to construction and reservoir uncertainty caused by.
4. fault block oil reservoir original oil-water level according to claim 3 of having developed determines method, which is characterized in that in step
It include fracture system, construction height and reservoir distribution to the evaluation that geological model of oil accumulation static data carries out in 2.
5. fault block oil reservoir original oil-water level according to claim 1 of having developed determines method, which is characterized in that in step
Initial oil-water interfaces estimation described in 3 sequentially includes the following steps:
(a) on the basis of geological research, chance oil reservoir situation is bored according to drilling well and is classified to fault block has been developed, is divided into brill and meets water
Layer and do not bore meet two kinds of situations of water layer；
(b) it is directed to the development block for not boring and meeting and being able to reflect the original reservoir state water layer, selection is able to reflect the original reservoir state
Brill meet the well of oil reservoir construction extreme lower position, oily bottom construction depth is H1, choose the brill chance for being able to reflect the original reservoir state
Water layer constructs the well of extreme higher position, and water top construction depth is H2；A series of initial oil-water interfaces are estimated using following formula:
Hwoc=H1+|H1-H2|/N (formula 1)
Wherein, HwocFor the initial oil water interface level of estimation, N is the initial oil-water interfaces item number of estimation；
(c) it is directed to the development block for not boring and meeting and being able to reflect the original reservoir state water layer, selection is able to reflect the original reservoir state
Brill meet the well of oil reservoir construction extreme lower position, oily bottom construction depth is H1.A series of initial greases are estimated using following formula
Interface:
Wherein, D is to have developed fault block be averaged well spacing, and θ is oil reservoir inclination angle.
6. fault block oil reservoir original oil-water level according to claim 1 of having developed determines method, which is characterized in that in step
In 4, using reservoir model-building and reservoir numerical simulation integrated technique, on the basis of geological model of oil accumulation, with the one of step 3 estimation
Serial oil-water interfaces are foundation, and exploitation dynamic data is carrying out reservoir numerical simulation just to different oil-water interfaces reservoir models
It drills.
7. fault block oil reservoir original oil-water level according to claim 1 of having developed determines method, which is characterized in that in step
In 5, the plot of water cut as a result, i.e. under oil reservoir difference oil-water interfaces is analyzed using the forward modeling under different oil-water interfaces, with reality
Plot of water cut compare, and accurate oil-water interfaces are obtained by the loop iteration of following steps:
If (a) fw(Hn)-fwh< ε, n=1...N, then Hwoc=Hn(formula 3)
Wherein, fw(Hn) be nth oil-water interfaces simulation moisture content, fwhFor practical moisture content, ε is the worst error allowed；
If (b) fw(Hn)-fwh> ε, n=1...N
The smallest two oil-water interfaces of the positive negative error of moisture content are then chosen, are enabled:
Wherein, piece 'wocNew oil-water interfaces estimated value after being fitted for the smallest two oil-water interfaces of the application positive negative error of moisture content,
HnAnd Hn+1For the smallest two oil-water interfaces height of the positive negative error of moisture content, εnAnd εn+1For nth and (n+1)th oil-water interfaces
Under moisture content error of fitting；
(c) using formula (4) calculate oil-water interfaces carry out forward simulation, circulation step (a)-(c), until simulate it is aqueous with it is real
The aqueous error in border reaches in error range of operation；
The oil-water interfaces of forward modeling result and the most identical forward model of real data are oil reservoir reality i.e. most probable oil
Water termination, the oil in place under the oil-water interfaces are that oil reservoir is most objective or accurate oil in place.
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| CN113803055A (en) * | 2020-06-11 | 2021-12-17 | 中国石油化工股份有限公司 | Oil-water interface depth determination method and early warning method for preventing water channeling of production well |
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