CN112052591A - Interlayer fine depicting and embedded modeling method under reservoir configuration constraint - Google Patents
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Abstract
The invention discloses a fine interlayer depicting method under the constraint of a reservoir structure, which comprises the following steps: (1) identifying different levels of reservoir configuration interfaces by using a core phase and a logging phase; (2) forecasting the reservoir configuration interfaces of different levels by using geological deposition patterns, horizontal well drilling, oil-water well production dynamics and test data; (3) classifying and combining the reservoir configuration interfaces of different levels; (4) quantitatively representing the spatial distribution characteristics of the reservoir configuration interfaces of different levels; and the different-level reservoir configuration interfaces comprise 4-level and 5-level reservoir configuration interfaces corresponding to different sedimentary microfacies. Meanwhile, according to the data determined by the interlayer fine depicting method, the invention also discloses an interlayer embedded modeling method under the constraint of the reservoir configuration, which can realize the complete retention of interlayer information after the reservoir model is coarsened and has important guiding significance for the numerical simulation research of the residual oil distribution characteristics of the oil reservoir at the later stage.
Description
Technical Field
The invention belongs to the technical field of petroleum and natural gas exploration and development, and particularly relates to a method for fine depiction and embedded modeling of an interlayer under the constraint of reservoir configuration.
Background
The interlayer in the oil field development process has an important influence on oil and gas seepage, controls the seepage of fluid in a reservoir and the distribution rule of residual oil, and is the key point of geological fine research at present; the three-dimensional reservoir geological modeling is taken as a mature three-dimensional visual reservoir characterization technology at present, can three-dimensionally display the development rule of a interlayer model in a reservoir, and has important guiding significance for guiding the analysis of the effect condition of an injection and production well group in water injection fine development, the adjustment of horizontal well geological guiding while drilling, the research of local residual oil distribution, the low oil reservoir production degree, the numerical reservoir simulation precision in the later period and other problems.
The interlayer in the reservoir generally has stable development and relatively small thickness change, but the development condition of the interlayer is not uniform, the thickness change is large, and the existence of the interlayer in the reservoir makes the seepage rule of the geological model and the fluid more complicated. At present, the interlayer characteristics in a reservoir can be described in a fine mode through geological modeling of an oil reservoir, but a certain difference exists between the scale of a numerical simulation grid system and the modeling, so that the fine geological model is required to be coarsened during the numerical modeling, coarsening can cause loss or incomplete information of the interlayer information in the model, fine characterization of the interlayer information in the reservoir cannot be effectively performed, information loss or partial loss of a sedimentary facies and attribute parameter model (porosity, permeability and saturation model) at the development position of the interlayer can be caused, a later-stage numerical simulation result can be greatly influenced, and the seepage flow rule of fluid in the reservoir and the residual oil distribution characteristics of the oil reservoir in the middle and later stages of development cannot be correctly reflected.
How to finely depict the interlayer in the reservoir and completely reserve the interlayer information of the fine geological model into the coarsened geological model is the core content of the current study of scholars, and at present, a plurality of modeling methods for the interlayer in the reservoir are aimed, for example, high-resolution sequence stratigraphy is taken as guidance to establish a model of the interlayer in the reservoir, or reservoir configuration characteristic study is carried out by combining seismic data, communication relation study of reservoir configuration elements of a well area of a dense well network is carried out, the internal configuration characteristic of the reservoir is quantitatively represented, or a configuration mode of a river facies is established to represent the interlayer in the reservoir by combining the reservoir configuration study thought, the methods can represent the interlayer in the reservoir, but different data have limitations to enable the knowledge of the underground interlayer to have multiple solutions, and meanwhile, the coarsening of the model can cause the loss of the interlayer information, therefore, a geological modeling method for precisely depicting the interlayer of the reservoir and completely retaining the information of the interlayer of the reservoir is required to be explored so as to solve the problem that the distribution characteristics of the residual oil cannot be accurately described by numerical reservoir simulation in the later period.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a fine interlayer depicting method under the constraint of a reservoir structure, which can effectively solve the problems of interlayer information loss or incompleteness, inaccurate numerical simulation result and the like in the traditional model coarsening process; meanwhile, the invention also provides a partitioning layer embedded modeling method under the constraint of reservoir configuration according to the data determined by the partitioning layer fine depicting method.
A method for finely depicting an interlayer under reservoir configuration constraint comprises the following steps:
(1) identifying different levels of reservoir configuration interfaces by using a core phase and a logging phase;
(2) forecasting the reservoir configuration interfaces of different levels by using geological deposition patterns, horizontal well drilling, oil-water well production dynamics and test data;
(3) classifying and combining the reservoir configuration interfaces of different levels;
(4) quantitatively representing the spatial distribution characteristics of the reservoir configuration interfaces of different levels;
the different-level reservoir structure interfaces comprise 4-level and 5-level reservoir structure interfaces corresponding to different deposition microfacies, the argillaceous structure elements corresponding to the 4-level and 5-level reservoir structure interfaces are interlayers and interlayers respectively, the interlayers comprise argillaceous interlayers and calcareous interlayers, and the interlayers comprise argillaceous interlayers and calcareous interlayers.
Preferably, the identification of the reservoir configuration interfaces of different levels by using the core facies and the logging facies in the step (1) is specifically as follows: the method comprises the steps of carrying out identification and interpretation on reservoir configuration interfaces of different levels in the vertical direction of a single well by using core phase data, wherein the reservoir configuration interfaces comprise a argillaceous interlayer, a calcareous interlayer, a argillaceous interlayer and a calcareous interlayer, establishing an interpretation mode of a single-well vertical logging configuration interface by establishing a corresponding relation between a core phase and a logging phase, and carrying out identification and interpretation on the reservoir configuration interfaces of different levels in the non-coring well by using the interpretation mode.
Preferably, the prediction of the reservoir configuration interface in the step (2) is to predict a planar reservoir configuration interface by using microphase deposition modes, horizontal well drilling data, oil-water well production dynamics and test data in different deposition environments of a block, so as to determine the development positions of the reservoir configuration interfaces in different levels in the lateral direction and the mutual relation between the reservoir configuration interfaces and adjacent wells.
Preferably, the classification of the different-level reservoir configuration interfaces in the step (3) is specifically as follows: dividing the reservoir configuration interfaces of different levels according to vertical identification and lateral configuration interface prediction results of the reservoir configuration interfaces of different levels, wherein the types of division comprise pinch-out type, continuous type and lateral cut-and-fold type;
the combination of the different-level reservoir configuration interfaces is specifically as follows: and combining development characteristics of the configuration elements corresponding to the reservoir configuration interfaces of different levels, and reasonably combining the reservoir configuration interfaces of different levels in the lateral direction by taking a microphase deposition mode as guidance to finish the characterization of the lateral relation of the reservoir configuration interfaces of different levels.
Preferably, the pinch-out type refers to discontinuous development of a reservoir configuration interface of the same level on two adjacent single wells, the corresponding configuration elements are characterized by isolated development, and the thickness of the configuration elements at two sides is thinned and pinch-out;
the continuous type refers to that the reservoir structure interface of the same level continuously develops on two adjacent single wells, the corresponding structure elements are characterized by continuous development, and the thickness of the structure elements towards two sides is basically kept stable;
the lateral cutting and folding type is that the reservoir structure interfaces of the same level are developed on two adjacent single wells, the thickness of the reservoir structure element corresponding to one well is increased, and the structure element interfaces have relevance.
Preferably, the quantitative characterization of the spatial distribution characteristics of the different-level reservoir configuration interfaces in the step (4) includes vertical development characteristics and corresponding depth and thickness data of the different-level reservoir configuration interfaces, and lateral development characteristics and corresponding depth and thickness data.
A method for modeling an interlayer embedded type under the constraint of reservoir configuration comprises the following steps:
establishment of reservoir interlayer and interlayer model
(11) Establishing a reservoir interlayer model:
(111) establishing a trend surface model of the top and the bottom of the interlayer based on the corresponding depth and thickness data of the interlayer obtained in the step (4);
(112) building a structural model of the interlayer by using the trend surface models of the top and the bottom of the interlayer in the step (111);
(113) in the phase modeling process, an interlayer phase model is established in an assignment mode, the interlayer phase model and the attribute parameter model are both assigned to be 0, and 1 grid is arranged in the vertical direction of the grid system;
(12) establishing a reservoir interlayer model:
(121) establishing trend surface models of the top and the bottom of the interlayer based on the corresponding depth and thickness data of the interlayer obtained in the step (4);
(122) performing boundary delineation and independent assignment on the trend surface model obtained in the step (121) according to the distribution range on the interlayer plane;
(123) establishing a structural model of the interlayer by using the trend surface models of the boundary range, the top and the bottom of the interlayer obtained in the step (122);
(124) in the phase modeling process, an interlayer phase model is established in an assignment mode, the interlayer phase model and the attribute parameter model are both assigned to be 0, and 1 grid is arranged in the vertical direction of the grid system;
(II) nesting of reservoir and interbed models
And (5) embedding the interlayer model built in the step (I) into a reservoir model to form a complete reservoir three-dimensional fine geological model containing interlayer information based on reservoir configuration constraint.
The invention has the advantages that:
according to the interlayer fine depicting method under reservoir configuration constraint, fine characterization is carried out on the interlayer, obtained data are used for interlayer embedded modeling under reservoir configuration constraint, complete retention of interlayer information after reservoir model coarsening can be achieved, meanwhile, the interlayer fine depicting method is not influenced by reservoir model coarsening parameters, the defect that the traditional model coarsening interlayer information is missing or incomplete is overcome, and the interlayer fine depicting method has important guiding significance for researching residual oil distribution characteristics through later-stage oil reservoir numerical simulation.
Drawings
FIG. 1 is a flow chart of a method for modeling an interlayer embedded model under reservoir configuration constraints, provided by the present invention;
FIG. 2 is a graphical representation of the interface identification of reservoir configurations of different levels provided by the present invention;
FIG. 3 shows the lateral development characteristics of the target layer 5-grade argillaceous interlayer (anterior delta mud) provided by the present invention;
FIG. 4 is an enlarged view of a portion 3a of FIG. 3;
FIG. 5 is an enlarged view of a portion 3b of FIG. 3;
FIG. 6 shows lateral development characteristics of a target layer, namely a 5-grade argillaceous interlayer and a 4-grade calcareous interlayer;
FIG. 7 is a schematic illustration of a pinch-off configuration interface provided by the present invention;
FIG. 8 is a schematic illustration of a continuous configuration interface provided by the present invention;
FIG. 9 is a schematic representation of a laterally cut and folded configuration interface provided by the present invention;
FIG. 10 is a argillaceous interlayer phase model corresponding to a 5-level configuration interface provided by the present invention;
FIG. 11 is a calcareous sandwich phase model corresponding to a 4-level configuration interface provided by the invention.
Detailed Description
Example 1
A method for finely depicting an interlayer under reservoir configuration constraint comprises the following steps:
(1) identifying the reservoir configuration interfaces of different levels by using a core phase and a logging phase: identifying and explaining the reservoir structure interfaces of different levels in the vertical direction of the single well by using the core phase data, wherein the reservoir structure interfaces comprise a argillaceous interlayer, a calcareous interlayer, a argillaceous interlayer and a calcareous interlayer, establishing an explanation mode of the vertical logging structure interface of the single well by establishing the corresponding relation between the core phase and the logging phase, and identifying and explaining the reservoir structure interfaces of different levels in the non-coring well by using the explanation mode; wherein, the logging response characteristic of the argillaceous interlayer is as follows: the natural potential SP and the natural gamma GR curve return to a mudstone base line obviously, the return degree is more than or equal to 50%, the acoustic time difference AC curve value is higher than that of sandstone, the microelectrode amplitude is reduced obviously, and the microelectrode amplitude has no amplitude difference basically;
the logging response characteristics of the calcareous interlayer are as follows: the natural potential SP and the natural gamma GR curve are not obviously abnormal, the microelectrode presents a high peak sawtooth shape and basically has no amplitude difference, the acoustic wave time difference AC presents a low-value peak, and the resistivity is higher than that of the Rt curve than that of sandstone;
the logging response characteristics of the argillaceous interlayer are as follows: the natural potential SP or the natural gamma GR obviously returns to a mudstone baseline, the returning degree is more than or equal to 50 percent, the acoustic wave time difference AC curve value is higher than that of sandstone, the microelectrode amplitude is obviously reduced, and basically no amplitude difference exists;
the logging response characteristics of the calcareous interlayer are as follows: the natural potential SP and the natural gamma GR curve are not obviously abnormal, the microelectrode presents a high peak zigzag shape, the acoustic wave time difference AC presents a low-value peak, and the resistivity Rt curve value is higher than that of sandstone.
(2) Predicting a reservoir formation interface by using a geological deposition mode, horizontal well drilling, oil-water well production dynamics and test data: predicting a planar reservoir configuration interface by utilizing a microphase sedimentation mode, horizontal well drilling data, oil-water well production dynamics and test data in different sedimentation environments of a block, and determining the development positions of the reservoir configuration interfaces of different levels in the lateral direction and the mutual relation between the reservoir configuration interfaces of different levels and adjacent wells;
(3) classification and combination of reservoir configuration interfaces of different levels:
(31) the classification of the different-level reservoir configuration interfaces is specifically as follows: dividing the reservoir configuration interfaces of different levels according to vertical identification and lateral configuration interface prediction results of the reservoir configuration interfaces of different levels, wherein the types of division comprise pinch-out type, continuous type and lateral cut-and-fold type;
the pinch-out type refers to discontinuous development of a reservoir structure interface of the same level on two adjacent single wells, the corresponding structure elements are characterized by isolated development, and the thickness of the structure elements at two sides is thinned and pinch-out;
the continuous type refers to that the reservoir structure interface of the same level continuously develops on two adjacent single wells, the corresponding structure elements are characterized by continuous development, and the thickness of the structure elements towards two sides is basically kept stable;
the lateral cutting and folding type is that the reservoir structure interfaces of the same level are developed on two adjacent single wells, the thickness of the reservoir structure element corresponding to one well is increased, and the structure element interfaces have relevance;
(32) the combination of the different-level reservoir configuration interfaces is specifically as follows: combining development characteristics of configuration elements corresponding to the reservoir configuration interfaces of different levels, reasonably combining the reservoir configuration interfaces of different levels in the lateral direction by taking a microphase deposition mode as guidance, and finishing representation of the lateral relation of the reservoir configuration interfaces of different levels;
(4) quantitatively representing the spatial distribution characteristics of the reservoir configuration interface at different levels: the method comprises the vertical development characteristics and the corresponding depth and thickness data of reservoir configuration interfaces of different levels, and the lateral development characteristics and the corresponding depth and thickness data;
the different-level reservoir formation interfaces comprise 4-level and 5-level reservoir formation interfaces corresponding to different deposition facies, the argillaceous formation elements corresponding to the 4-level and 5-level reservoir formation interfaces are interlayers and interlayers respectively, the interlayers comprise argillaceous interlayers and calcareous interlayers, and the interlayers comprise argillaceous interlayers and calcareous interlayers.
Example 2
A interlayer embedded modeling method under reservoir configuration constraint is disclosed, the flow schematic diagram of which is shown in figure 1, and the method comprises the following steps:
establishing a reservoir interlayer and interlayer model:
(11) establishing a reservoir interlayer model:
(111) establishing a trend surface model of the top and the bottom of the interlayer based on the corresponding depth and thickness data of the interlayer obtained in the step (4) in the embodiment 1;
(112) in the construction modeling, directly using the trend surface models of the top and the bottom of the interlayer in the step (111) to establish a construction model of the interlayer;
(113) in the phase modeling process, an interlayer phase model is established in an assignment mode, the interlayer phase model and the attribute parameter model are both assigned to be 0, and 1 grid is arranged in the vertical direction of the grid system;
(12) establishing a reservoir interlayer model:
(121) establishing trend surface models of the top and the bottom of the interlayer based on the corresponding depth and thickness data of the interlayer obtained in the step (4) in the embodiment 1;
(122) performing boundary delineation and independent assignment on the trend surface obtained in step (121) according to the distribution range on the interlayer plane;
(123) in the construction modeling, the structural model of the interlayer is established by using the trend surface models of the boundary range, the top and the bottom of the interlayer obtained in the step (122);
(124) in the phase modeling process, an interlayer phase model is established in an assignment mode, the interlayer phase model and the attribute parameter model are both assigned to be 0, and 1 grid is arranged in the vertical direction of the grid system;
(II) nesting the reservoir and the interlayer model:
and (3) embedding the interlayer model built in the step (2) into a reservoir model to form a set of complete reservoir three-dimensional fine geological model containing interlayer information based on reservoir configuration constraint.
Example 3
In this embodiment, the invention is specifically analyzed and explained by taking the extended S-block in the county area of the oil field in the south of the orldos basin as an example. The research area is positioned in the south of the Ordos basin, and the internal structure of the area block is simple, namely the research area is a west inclined single inclined area and has no fault development; the main objective layer of the research area is an extended length 8 oil layer group, the main deposition background is two types of subphase deposition of the front edge of the delta and the front delta, and three types of microphase of mud of the underwater diversion river channel, the space between the underwater diversion river channels and the front delta are mainly developed; minor major force layer length 82Small layer rockThe properties of the sandstone are mainly fine sandstone and then fine sandstone, the grains are mostly in an edge-sub-circle shape, the weathering of chips is severe, the sorting and rounding are moderate, the point-line contact is realized, and the average porosity is 9.76%; average effective permeability of 0.35X 10-3μm2The average sand thickness is 24m, the shape of the logging curve is mainly 'box type', the sand body thickness is stable, the continuity is good, a argillaceous interlayer and a calcareous interlayer are developed inside the target layer, wherein the argillaceous interlayer is mainly developed, the interlayer is stably developed, the argillaceous interlayer and the calcareous interlayer are mainly developed in the interlayer, and the interlayer is not stably developed.
A method for finely depicting an interlayer under reservoir configuration constraint comprises the following steps:
(1) identifying a reservoir configuration interface by using a core phase and a logging phase: identifying and explaining the reservoir structure interfaces of different levels in the vertical direction of the single well by using the core phase data, wherein the reservoir structure interfaces comprise a argillaceous interlayer, a calcareous interlayer, a argillaceous interlayer and a calcareous interlayer, establishing an explanation mode of the vertical logging structure interface of the single well by establishing the corresponding relation between the core phase and the logging phase, and identifying and explaining the reservoir structure interfaces of different levels in the non-coring well by using the explanation mode; the logging response characteristics of the argillaceous interlayer are as follows: the natural potential SP and the natural gamma GR curve return to a mudstone base line obviously, the return degree is more than or equal to 50%, the acoustic time difference AC curve value is higher than that of sandstone, the microelectrode amplitude is reduced obviously, and the microelectrode amplitude has no amplitude difference basically; the logging response characteristics of the calcareous interlayer are as follows: the natural potential SP and the natural gamma GR curve are not obviously abnormal, the microelectrode presents a high peak sawtooth shape and basically has no amplitude difference, the acoustic wave time difference AC presents a low-value peak, and the resistivity is higher than that of the Rt curve than that of sandstone; the logging response characteristics of the argillaceous interlayer are as follows: the natural potential SP or the natural gamma GR obviously returns to a mudstone baseline, the returning degree is more than or equal to 50 percent, the acoustic wave time difference AC curve value is higher than that of sandstone, the microelectrode amplitude is obviously reduced, and basically no amplitude difference exists; the logging response characteristics of the calcareous interlayer are as follows: the natural potential SP and the natural gamma GR curve are not obviously abnormal, the microelectrode presents a high peak zigzag shape, the acoustic wave time difference AC presents a low-value peak, and the resistivity Rt curve value is higher than that of sandstone. As shown in fig. 2, the target layer of the L110 exploratory well vertically develops 4 sets of stably deposited argillaceous interlayers corresponding to 5-level configuration interfaces, wherein the bottommost developed gray and gray black li-jia-side shale interlayer is about 8-15m thick and is the most stable interlayer in the research area; 2 sets of mud interlayer are developed in the target layer, wherein the lower set of mud interlayer is light gray, gray mud and silty mudstone, the thickness is about 6-8m, and the interlayer is stable in a research area; the upper set is formed by a set of stably developed black and dark black mudstone sediment with the thickness of about 6-8m due to the large-scale rise of the lake plane in the sedimentation period; the topmost set is light gray, gray mudstone and silty mudstone, and the thickness of the topmost set is about 3-5 m. Meanwhile, 9 sets of calcareous and argillaceous interlayers (8 sets of calcareous interlayers and 1 set of argillaceous interlayer) are developed in the L110 exploratory well target layer, the thickness of each interlayer is 0.2-0.8m, the average thickness is about 0.4m, and the interlayers are generally light gray, gray argillaceous siltstone argillaceous or calcareous interlayers; and identifying and interpreting the reservoir configuration interfaces of different levels in the vertical direction of the target layer of other non-cored wells in the research area by using the established logging interpretation mode, thereby completing the identification of the reservoir configuration interfaces of different levels in the vertical direction of the target layer of the single well in the work area.
(2) Predicting a reservoir formation interface by using a geological deposition mode, horizontal well drilling, oil-water well production dynamics and test data: and predicting a planar reservoir configuration interface by using a microphase sedimentation mode, horizontal well drilling data, oil-water well production dynamics and test data in different sedimentation environments of a block, and determining the development positions of the reservoir configuration interfaces of different levels in the lateral direction and the mutual relation between the reservoir configuration interfaces of different levels and adjacent wells. According to the identification interpretation mode of reservoir structure interfaces of different levels in the vertical direction of the target layer of the uncased well established in the last step, the lateral prediction of a argillaceous interlayer and a calcareous interlayer corresponding to the 5-level structure interface is further carried out by combining with a microphase sedimentation mode, aiming at the prediction of the structure interface of the interlayer, as shown in figure 3, the front delta argillaceous rock interlayer explained in the figure is determined jointly according to the interpretation mode of the vertical logging structure interface of a single well and microphase sedimentation characteristics (a sedimentary microphase plane layout and a regional sedimentation mode of the argillaceous interlayer), the development scale of the argillaceous interlayer in the research is determined, the lateral development characteristics of the corresponding structure interface are further determined, the data such as the lateral development position and the depth of the argillaceous interlayer are determined, the front delta argillaceous interlayer in the profile of the well of L147-1-L143-2 in the figure is stable in development, and the thickness of the 5-mouth single well argillaceous interlayer, the lateral continuity is better. For the configuration interface prediction of the interlayer, as shown in fig. 6, firstly, a front delta argillaceous interlayer is established as a specific target sediment body at the same period, and lateral prediction of different interlayer configuration interfaces is performed in a microphase sedimentation mode and an established logging interpretation mode, for example, upper No. VI, VII and VIII calcareous interlayers between a well L110-1 and a well L110-4 are laterally developed, lower No. I, II, III, IV and V calcareous interlayers are laterally killed, the interlayer development is complex, and the continuity is poor; overall interlayer lateral continuity is good and interlayer lateral continuity is poor.
(3) Classification and combination of reservoir configuration interfaces of different levels: (31) the classification of the different-level reservoir configuration interfaces is specifically as follows: dividing the reservoir configuration interfaces of different levels according to the vertical identification and lateral configuration interface prediction results of the reservoir configuration interfaces of different levels, wherein the types of the division comprise a pinch-out type (figure 7), a continuous type (figure 8) and a lateral cut-and-overlap type (figure 9);
the pinch-out type refers to discontinuous development of a reservoir structure interface of the same level on two adjacent single wells, the corresponding structure elements are characterized by isolated development, and the thickness of the structure elements at two sides is thinned and pinch-out; particularly between the L110 and L110-1 wells in FIG. 6
、
The development characteristics of the calcareous interlayer are shown, the configuration interface is of a catatonic type, the interlayer corresponding to the configuration interface of the catatonic type is unstable in development in the lateral direction, and meanwhile, the interlayer is arranged between wells
、
The calcareous interlayer configuration interface is also of a fighter plane type; similarly, the I, II, III, IV and IV between the L110-1 and L110-4 wells,V, the calcareous interlayer configuration interface is of a firefighting type;
the continuous type refers to that the reservoir structure interface of the same level continuously develops on two adjacent single wells, the corresponding structure elements are characterized by continuous development, and the thickness of the structure elements towards two sides is basically kept stable; specifically, as shown in the front delta argillaceous interlayer development characteristic shown in fig. 3, the configuration interface is continuous; in FIG. 6, the argillaceous interlayer is of a continuous type; between L110 and L110-1 well
、
、
、
And VII and VIII calcareous interlayer configuration interfaces between the L110-1 well and the L110-4 well are continuous, and interlayers corresponding to the configuration interfaces develop stably in the lateral direction;
the lateral cutting and folding type is that the reservoir structure interfaces of the same level are developed on two adjacent single wells, the thickness of the reservoir structure element corresponding to one well is increased, and the structure element interfaces have relevance; specifically, as shown in the development characteristics of the VI calcareous interlayer between the L110-1 well and the L110-4 well in FIG. 6, the configuration interface is of a lateral cutting and folding type, and the interlayers corresponding to the configuration interface of the type are not consistent in development thickness in the lateral direction;
(32) the combination of the different-level reservoir configuration interfaces is specifically as follows: combining development characteristics of configuration elements corresponding to the reservoir configuration interfaces of different levels, reasonably combining the reservoir configuration interfaces of different levels in the lateral direction by taking a microphase deposition mode as guidance, and finishing representation of the lateral relation of the reservoir configuration interfaces of different levels; the front delta argillaceous interlayer shown in figure 3 is formed by combining the adjacent interlayer structure interfaces L147-1-L143-2 according to the morphological characteristics of the interlayer structure elementsThe shale configuration elements in the well profile develop continuously in the lateral direction, and all belong to the lateral combination of a 5-level configuration interface and a 5-level configuration interface; such as between the L110 and L110-1 wells in FIG. 6
、
、
、
All belong to the firefighting configuration interface,
、
、
、
both belong to the lateral combination of a 4-level configuration interface and a 4-level configuration interface; VI, VII and VIII between the L110-1 and the L110-4 wells belong to lateral combination of a 4-level configuration interface and a 4-level configuration interface; (4) quantitatively representing the spatial distribution characteristics of the reservoir configuration interface at different levels: the method comprises the vertical development characteristics, the corresponding depth and thickness data and the lateral development characteristics, the corresponding depth and thickness data of the reservoir configuration interfaces of different levels; for the argillaceous interlayer in fig. 6, the development position and depth thickness data of the argillaceous interlayer in the lateral direction are determined according to the lateral development characteristics of the front delta argillaceous interlayer determined from (31) and (32), wherein the development top of the L110 front delta argillaceous interlayer is 1300.45m in vertical depth, the thickness is 5.70m, the development top of the L110-1 front delta argillaceous interlayer is 1299.40.00m in vertical depth, the thickness is 6.10m, the development top of the L110-4 front delta argillaceous interlayer is 1304.20m, the thickness is 5.40m, and a 5-level configuration boundary between the three single wells is 5The surface is continuous, the combination type is the lateral combination of a 5-level configuration interface and a 5-level configuration interface, and the parameters are arranged to form a 5-level configuration interface data system; for the calcareous interlayer in fig. 6, the development position and depth thickness data in the lateral direction are determined according to the lateral development characteristics of the calcareous interlayer determined in (31) and (32), and L110 well
The top of the calcareous interbody development is 1312.13m deep and 0.32m thick, and the L110-1 well
The top of the calcareous interbody development is 1310.15m deep and 0.25m thick, and the L110-4 well
The top of the calcareous interlayer is 1316.45m deep and 0.55m thick, and the L110 well (calcareous interlayer) and the L110-1 well are developed
The interface of the calcium interlayer structure belongs to a continuous type, the combination type is the lateral combination of a 4-level structure interface and a 4-level structure interface, the interface of the calcium interlayer structure VI developed between an L110-1 well and an L110-4 well belongs to a lateral cut-and-fold type, and the combination type is the lateral combination of the 4-level structure interface and the 4-level structure interface.
A method for modeling an interlayer embedded type under the constraint of reservoir configuration comprises the following steps:
establishing a reservoir interlayer and interlayer model:
(11) establishing a reservoir interlayer model:
the bottom of a target layer in a research area is a stably developed shale interlayer of a zhanjia beach, and the upper part is two sets of stably developed mud deposits (one set is mud deposits of a front delta formed by large-area rising of a lake plane in the deposition process); the first set of argillaceous interlayer is gray, dark gray argillaceous rocks and silty argillaceous rocks from bottom to top, the development level and the ripple bedding are realized, the thickness is 3-5.0m, the electrical characteristics obviously show argillaceous, and the set of argillaceous interlayer is relatively stable in development in a research area; the second set of argillaceous interlayer is formed by deposition of gray black and black argillaceous rocks, the thickness of the second set of argillaceous interlayer is 6-10m, the electrical characteristics have obvious argillaceous rock characteristic display, the natural potential is close to a base line, the natural gamma value is high, the acoustic wave time difference is low, the microelectrode series is low, the permeability is almost zero, and the like, and the second set of argillaceous interlayer is most stable in development in the whole research area; aiming at the establishment of the argillaceous interlayer model, the concrete process is as follows: 1) according to the result determined in the step (4) in the embodiment, the vertical depth and thickness data, the lateral corresponding depth and thickness data corresponding to the 5-level shale interlayer of the single well target layer of the research area are imported into geological modeling software and used as basic data; 2) compiling a top and bottom trend Surface model of a set of mud interlayers by using a Make Surface module in a petroleum reservoir geological modeling software petrel2015 platform, wherein the trend of the trend Surface model follows the construction trend of a reservoir model; 3) repeating the step 2 to generate trend surface models of the top surfaces and the bottom surfaces of other interlayers in the target layer; 4) directly applying trend surface data of the top and the bottom of the interlayer during construction modeling, establishing an interlayer phase model in an assignment mode in the phase modeling process, directly assigning '0' to both the interlayer phase model and the attribute parameter model, arranging 1 grid in the vertical direction in the grid arrangement, and positioning according to phase change points on a plane so as to establish the interlayer model of a research area, as shown in figure 10;
(22) establishing a reservoir interlayer model:
the interlayer in the target layer of the research area is relatively developed, the thickness change is relatively large, the interlayer is developed from 0.2m to 0.8m, the physical property of the reservoir is poor due to the interlayer in the reservoir, and the heterogeneity in the longitudinal direction is enhanced; the interlayer in the target layer of the research area mainly comprises a calcareous interlayer, the argillaceous interlayer is the second interlayer, and the calcareous interlayer and the argillaceous interlayer both correspond to different logging response characteristics. In the class 4 calcareous interlayer for this study area
And the establishment of No. VI calcareous interlayer model, the concrete process is as follows: 1) according to the result determined in the step (4) in the embodiment, the vertical depth corresponding to the level 4 calcareous interlayer of the target layer of the single well in the research areaImporting the thickness data, the lateral corresponding depth and the thickness data into geological modeling software to be used as basic data; 2) compiling a top and bottom trend Surface model of a certain set of calcareous interlayers by using a Make Surface module in an oil reservoir geological modeling software petrel2015 platform; 3) repeating the step 2 to generate trend surface models of the top surfaces and the bottom surfaces of other interlayers in the target layer; 4) performing interlayer boundary delineation and independent assignment on the obtained trend surface by combining the interlayer lateral development characteristics; 5) during construction modeling, an interlayer boundary range and an interlayer top and bottom trend surface model are established by adopting a layer and boundary control method, an interlayer phase model is established by adopting an assignment mode in the phase modeling process, the interlayer phase model and the attribute parameter model are directly assigned with '0', and 1 grid is vertically arranged in the grid arrangement, as shown in fig. 11.
(II) nesting the reservoir and the interlayer model:
embedding the interlayer model built in the step (I) into a reservoir model, so that a complete reservoir geological model comprising the reservoir model, the interlayer and the interlayer model can be formed, only the reservoir model needs to be coarsened in a later stage model coarsening process (at any scale), and the interlayer model does not participate in the coarsening process, so that interlayer information in the reservoir can be completely reserved, and a complete reservoir three-dimensional fine geological model comprising interlayer information under the constraint of the reservoir configuration is formed.
Finely depicting the interlayer inside the reservoir by combining a reservoir configuration theory, further establishing a reservoir interlayer model, and finally realizing the nesting of the reservoir and the interlayer model; the interlayer model in the modeling method is not affected by coarsening of the reservoir model, so that interlayer information in the reservoir can be completely reserved, and a finer geological model data body is provided for numerical simulation of a later-stage oil reservoir.
Claims (7)
1. A method for finely depicting an interlayer under reservoir configuration constraint is characterized by comprising the following steps: the method comprises the following steps:
(1) identifying different levels of reservoir configuration interfaces by using a core phase and a logging phase;
(2) forecasting the reservoir configuration interfaces of different levels by using geological deposition patterns, horizontal well drilling, oil-water well production dynamics and test data;
(3) classifying and combining the reservoir configuration interfaces of different levels;
(4) quantitatively representing the spatial distribution characteristics of the reservoir configuration interfaces of different levels;
the different-level reservoir structure interfaces comprise 4-level and 5-level reservoir structure interfaces corresponding to different deposition microfacies, the argillaceous structure elements corresponding to the 4-level and 5-level reservoir structure interfaces are interlayers and interlayers respectively, the interlayers comprise argillaceous interlayers and calcareous interlayers, and the interlayers comprise argillaceous interlayers and calcareous interlayers.
2. The method for finely depicting the interlayer under the constraint of the reservoir configuration according to claim 1, wherein the method comprises the following steps: the identification of the reservoir configuration interfaces of different levels by using the core facies and the logging facies in the step (1) is specifically as follows: the method comprises the steps of carrying out identification and interpretation on reservoir configuration interfaces of different levels in the vertical direction of a single well by using core phase data, wherein the reservoir configuration interfaces comprise a argillaceous interlayer, a calcareous interlayer, a argillaceous interlayer and a calcareous interlayer, establishing an interpretation mode of a single-well vertical logging configuration interface by establishing a corresponding relation between a core phase and a logging phase, and carrying out identification and interpretation on the reservoir configuration interfaces of different levels in the non-coring well by using the interpretation mode.
3. The method for finely depicting the interlayer under the constraint of the reservoir configuration according to claim 2, wherein the method comprises the following steps: and (3) predicting the different-level reservoir configuration interfaces in the step (2) by using microphase deposition modes, horizontal well drilling data, oil-water well production dynamics and test data in different deposition environments of a block to predict a planar reservoir configuration interface, and determining the development positions of the different-level reservoir configuration interfaces in the lateral direction and the mutual relation between the different-level reservoir configuration interfaces and adjacent wells.
4. The method for finely depicting the interlayer under the constraint of the reservoir configuration according to claim 3, wherein the method comprises the following steps: the classification of the reservoir configuration interfaces of different levels in the step (3) is specifically as follows: dividing the reservoir configuration interfaces of different levels according to vertical identification and lateral configuration interface prediction results of the reservoir configuration interfaces of different levels, wherein the types of division comprise pinch-out type, continuous type and lateral cut-and-fold type;
the combination of the different-level reservoir configuration interfaces is specifically as follows: and combining development characteristics of the configuration elements corresponding to the reservoir configuration interfaces of different levels, and reasonably combining the reservoir configuration interfaces of different levels in the lateral direction by taking a microphase deposition mode as guidance to finish the characterization of the lateral relation of the reservoir configuration interfaces of different levels.
5. The method for finely depicting the interlayer under the constraint of the reservoir configuration according to claim 4, wherein the method comprises the following steps: the pinch-out type refers to discontinuous development of a reservoir structure interface of the same level on two adjacent single wells, the corresponding structure elements are characterized by isolated development, and the thickness of the structure elements at two sides is thinned and pinch-out;
the continuous type refers to that the reservoir structure interface of the same level continuously develops on two adjacent single wells, the corresponding structure elements are characterized by continuous development, and the thickness of the structure elements towards two sides is basically kept stable;
the lateral cutting and folding type is that the reservoir structure interfaces of the same level are developed on two adjacent single wells, the thickness of the reservoir structure element corresponding to one well is increased, and the structure element interfaces have relevance.
6. The method for finely depicting the interlayer under the constraint of the reservoir configuration according to claim 5, wherein the method comprises the following steps: and (4) quantitatively representing the spatial distribution characteristics of the different-level reservoir configuration interfaces, wherein the quantitative representations comprise vertical development characteristics, corresponding depth and thickness data, and lateral development characteristics, corresponding depth and thickness data of the different-level reservoir configuration interfaces.
7. A method for modeling an interlayer embedded type under the constraint of reservoir configuration is characterized in that: the method comprises the following steps:
establishment of reservoir interlayer and interlayer model
(11) Establishing a reservoir interlayer model:
(111) establishing a trend surface model of the top and the bottom of the interlayer based on the corresponding depth and thickness data of the interlayer;
(112) building a structural model of the interlayer by using the trend surface models of the top and the bottom of the interlayer in the step (111);
(113) in the phase modeling process, an interlayer phase model is established in an assignment mode, the interlayer phase model and the attribute parameter model are both assigned to be 0, and 1 grid is arranged in the vertical direction of the grid system;
(12) establishing a reservoir interlayer model:
(121) establishing trend surface models of the top and the bottom of the interlayer based on the corresponding depth and thickness data of the interlayer;
(122) performing boundary delineation and independent assignment on the trend surface model obtained in the step (121) according to the distribution range on the interlayer plane;
(123) establishing a structural model of the interlayer by using the trend surface models of the interlayer boundary range, the top and the bottom obtained in the step (122);
(124) in the phase modeling process, an interlayer phase model is established in an assignment mode, the interlayer phase model and the attribute parameter model are both assigned to be 0, and 1 grid is arranged in the vertical direction of the grid system;
(II) nesting of reservoir and interbed models
Embedding the interlayer model built in the step (one) into a reservoir model;
wherein, the interlayer corresponding depth and thickness data and the interlayer corresponding depth and thickness data are obtained by the step (4) of the interlayer fine-characterization method under the reservoir configuration constraint of claim 6.
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