CN111734406B - Front edge single sand layer plane energy difference characterization method - Google Patents
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Abstract
The invention relates to a method for characterizing the plane energy difference of a single sand layer at the front edge. Mainly solves the contradiction and prominence problem that the thin layer sand large area mat-shaped development block has unbalanced effect caused by the change of plane seepage energy. The method comprises the following steps: 1) Automatically generating random phase band diagrams of all the deposition units by utilizing oil reservoir automatic drawing software; 2) Analyzing lithology and logging curve differences by using a coring core comprehensive graph, establishing an energy microphase logging mode, counting lithology physical parameters of a single sand layer by using a layered database, making a histogram, determining each energy microphase distribution interval, and establishing an energy microphase classification standard by combining the energy microphase logging mode; 3) Regenerating a random phase band diagram of the deposition unit with energy microphase change; 4) And the man-machine interaction drawing of the phase band diagram of the thin-layer sand with plane energy attenuation change is classified into four sand body types. The characterization method improves the knowledge of the plane heterogeneous characteristics of the single sand layer at the front edge, and is suitable for the communication relation analysis of the medium-low permeability reservoir.
Description
Technical Field
The invention relates to the technical field of oilfield reservoir research, in particular to a leading edge single sand layer plane energy difference characterization method.
Background
The front single sand layer is the sand layer which is subdivided into the minimum deposition units in the vertical direction and has the characteristics of single and stable layer position, planar sand body mat-like distribution and traceability. The method is a main object of oil field secondary and tertiary encryption water flooding development, through water flooding development for years, the overall utilization thickness reaches 82.4%, but after entering a high water content period, the contact relation between the surface observation monolayers is good, the difference of the effective results is large, the sand body plane seepage law is not known clearly, and the difficulty of residual oil analysis and measure adjustment is increased. Under the current requirement of accurate development, aiming at a front single sand layer, it is very important to provide a characterization method capable of reflecting plane seepage difference.
Chinese patent CN201310517846.8 discloses a "thin Shan Shaceng thickness prediction method", which is an effective prediction method for simply and rapidly and quantitatively describing the thickness of a thin single sand layer by using the average reflection intensity attribute extracted from a three-dimensional earthquake, and comprises the steps of optimizing the seismic attribute, determining the time window range of the extracted attribute, extracting the average reflection intensity attribute, normalizing, establishing the relation between the average reflection intensity value and the thickness of the single sand layer, calculating the thickness of the single sand layer, correcting the extreme value, and compiling a thickness map of the single sand layer. The efficiency and the effectiveness of the thin single sand layer prediction are improved, so that the single sand layer thickness prediction anastomosis rate is more than 80%.
However, the related art has at least the following problems: the method mainly focuses on the thickness of the well earthquake combined prediction thin Shan Shaceng, solves the problem that the drilling rate of single sand layer sandstone is improved by drilling, and solves the problem that the contradiction between effectiveness imbalance and prominence is caused by the change of plane seepage energy when the thin sand layer large-area mat-shaped development block enters the later stage of high water content.
Disclosure of Invention
The invention aims to solve the technical problems of uneven effect caused by the change of plane seepage energy in the later period of entering high water content of a large-area mat-shaped development block of thin-layer sand in the background technology, and provides a front single sand layer plane energy difference characterization method.
The invention solves the problems by the following technical proposal: the front edge single sand layer plane energy difference characterization method comprises the following steps:
1) Collecting layering limit database, well position coordinate database, well deviation data, layering database and production well logging curve vectorization data of the deposition units, loading data by using oil reservoir automatic drawing software, and automatically generating random phase band diagrams of the deposition units by software through layering limit phase type and communication relation calculation;
2) On the basis of the random phase diagram of the deposition units, the thin layer sand on the plane is developed in a mat shape in a large area, the phase diagram of the deposition units with energy attenuation change is selected, lithology and logging curve differences are analyzed by using a core comprehensive diagram of a coring well, an energy microphase logging mode is established, a layering database in the step is used for making an effective thickness and permeability histogram, and an energy microphase logging mode is combined to establish an energy microphase classification standard;
3) Defining a deposition microphase in oil reservoir automatic drawing software by utilizing an energy microphase classification standard in the step II, and regenerating a deposition unit random phase diagram with energy microphase change by using different color characterization of each energy microphase;
4) On the basis of the random phase diagram of the deposition unit with the micro-phase change of energy, combining the sand body distribution scale, the object source direction and the logging curve form, drawing the phase diagram of the thin-layer sand with the plane energy attenuation change through man-machine interaction, and classifying the thin-layer sand into four sand body types.
The method for establishing the energy microphase logging mode comprises the steps of analyzing lithology characteristics (including granularity and argillaceous content changes) by utilizing a coring comprehensive diagram; and analyzing the characteristics of the logging curve (including amplitude difference and amplitude fluctuation change of the microelectrode curve, negative anomaly value of natural potential and morphological change), and establishing an energy microphase logging mode according to lithology and logging curve difference.
The step (c) is characterized in that the energy microphase logging mode comprises the following steps: the dam core part, the dam main body and the dam edge part are provided with 8 microphase modes, namely, a residual underwater diversion river channel, main body type of sand, non-main body sand and an external reservoir.
The step II is that a layering database is utilized to count lithology parameters, namely effective thickness, physical parameters, namely permeability distribution range of a single sand layer, a histogram is made, each energy microphase distribution interval is determined, and energy microphase logging modes are combined to respectively establish energy microphase classification standards of different sand body types;
the four sand body types with plane energy attenuation change in the step comprise river control residual underwater river channel type, river control wave control transition type, wave control far sand dam type and wave control coastal dam type.
Compared with the background technology, the invention has the following beneficial effects:
1. the invention establishes an energy microphase classification standard. The conventional deposition microphase classification of the single sand layer at the front edge is divided into four deposition microphases of a sand dam, main body sand, non-main body sand and an external reservoir according to the effective thickness level. The deposition microphase classification method fully considers the background of the deposition environment, further refines the deposition microphase according to energy change according to curve morphology and thickness and permeability parameter distribution range, and determines the classification standard. The wave-control sand dam is further subdivided into a dam core part, a dam main body and a dam edge part, the river-control main body mat sand is further subdivided into a residual underwater diversion river microphase, and the river-control wave-control transition main body mat sand is subdivided into main body type mat sand and main body type mat sand. The classification is finer and scientific, the difference of the lithology and physical properties of the plane is fully reflected, the basis quantification of the sediment microphase can be realized, and the operability is strong.
2. Compared with the conventional method, the conventional method is that software automatically generates random phase diagrams of all deposition units, the characteristics of logging curves are not combined, the directivity of a material source is lacked, and the characteristics of plane heterogeneity are unclear. The invention uses the energy microphase classification standard, the plane characterizes each energy microphase by different colors, and combines the sand body distribution scale, the object source direction and the logging curve form, so that the invention is more beneficial to identifying the water flooding dominant channel and the variation zone, and the communication degree between wells is clearer.
3. According to the research results of the invention, the types of the residual oil are summarized, and the diving countermeasure is formulated.
The application of the research results shows that the front single sand layer is distributed in a large-area mat shape, and the thin sand body with energy change is easy to form plane seepage differential type residual oil, and the seepage direction is optimized by adopting countermeasures such as water shutoff, fracturing, plane adjustment and the like.
Drawings
FIG. 1 is a random phase diagram of each deposition unit automatically generated by software in the steps of the embodiment of the invention;
FIG. 2 is a phase bottom view of a deposition unit with energy attenuation change in accordance with an embodiment of the present invention;
FIG. 3 is a comparison of production well connection profiles for steps in an embodiment of the present invention;
FIG. 4 is a diagram of a medium energy microphase logging mode of steps in an embodiment of the present invention;
FIG. 5 is a histogram of the effective thickness distribution ratio of the type of the wave controlled coastal dam sand in the step of the embodiment of the invention;
FIG. 6 is a histogram of the distribution ratio of the permeability of the sand type of the medium wave controlled coastal dam in the steps of the embodiment of the invention;
FIG. 7 is a diagram showing a step of classifying energy microphases in a sand type with energy attenuation change according to the embodiment of the present invention;
FIG. 8 is a diagram showing the type of the deposition phase of the energy microphase software in the step of the present invention;
FIG. 9 is a graph of four sand types with energy variation plotted in step IV of an embodiment of the present invention;
FIG. 10 is an analysis chart of countermeasures taken for plane seepage differential type residual oil having energy variation formed in the steps of the embodiment of the present invention.
The specific embodiment is as follows:
the invention will be further described with reference to the accompanying drawings and examples:
example 1:
the front single sand layer plane energy difference characterization method of the invention is used for illustrating the implementation process of the method by taking the eastern part of the apricot ten-area pure oil area of Daqing oilfield as an example.
Collecting a layering limit database, a well position coordinate database, well deviation data, a layering database and production well logging curve vectorization data of a deposition unit, loading data by using GPTmap oil reservoir automatic drawing software, and automatically generating random phase-band diagrams of each deposition unit by the software through layering limit phase type and communication relation calculation (see figure 1);
step (2) on the basis of the random phase diagram of the deposition units, the thin layer sand on the plane is developed in a mat shape in a large area, and the phase diagram of the deposition units with energy attenuation change is selected (see figure 2). For example: the eastern part of the pure oil region in the apricot ten region vertically develops 59 deposition units, and 30 deposition unit phase belt base charts with energy attenuation change are selected. The method comprises the steps of establishing a production well connecting section (see figure 3), analyzing the morphological change of a logging curve, and establishing an energy microphase logging mode (see figure 4), wherein the energy microphase logging mode comprises 8 microphase modes of a dam core part, a dam main body and a dam edge part, and the 8 microphase modes comprise a residual underwater diversion river channel, main body type of sand, non-main body sand and an external reservoir. And (3) counting lithology parameters, namely effective thickness and physical parameters, namely permeability distribution range of a single sand layer, using a layered database in the step (A), making a histogram, determining each energy microphase distribution interval, and establishing an energy microphase classification standard by combining an energy microphase logging mode.
Taking sand body type of wave-controlled coastal dam development as an example (see fig. 5 and 6), calculating effective thickness and permeability of a 500-well S215a deposition unit at the eastern part of the apricot ten region, and taking a histogram, wherein the effective thickness is concentrated and developed between 1.5m and 3.0m from the aspect of distribution, and the proportion is 63.58%. Wherein, the single sand layer with the effective thickness more than or equal to 2.5m accounts for 22.3 percent, the curve shape has the characteristics of a dam core part, and the permeability > =230mD; the method comprises the steps of taking 34.6% of a single sand layer with the effective thickness of (2.5-2.0 m), taking up 28.9% of a single sand layer with the effective thickness of (2.0-1.5 m) and the permeability of between 120 and 180mD, determining that the effective thickness of the main sand layer is between (1.5-0.5 m) and the permeability is less than 120mD according to the thickness division standard of a large-scale oil field single sand layer sediment zone diagram preparation technology, referencing the permeability histogram distribution range, determining that the effective thickness of the main sand layer is between (1.5-0.5 m), and the permeability is less than 120mD, taking up the effective thickness of the non-main sand layer to be between (0.5-0 m), comparing the effective thickness of the outer sand layer with the effective thickness of the main sand layer to be equal to 0. By a new sediment microphase classification method, taking the main sand layer and the main sand layer out of the main sand layer according to an energy phase well measurement mode, combining the effective thickness and the permeability of the main sand layer to a permeability well measurement mode, further determining that the effective thickness and the permeability of the main sand layer are different from the well volume measurement mode by a large-scale, and further determining that the differential of the main sand layer is more than 7 m, and the differential volume can be fully divided according to the differential volume of the figure, and the differential volume of the figure is well.
Step III, defining a deposition microphase in GPTmap software by utilizing the energy microphase classification standard in the step III, and representing each energy microphase by using different colors. Taking the eastern region of the apricot ten region as an example, firstly, setting a deposition phase according to a classification standard. In GPTmap software, setting the sediment phase setting phase type in a menu bar, setting nine types of energy microphases, namely a dam core part A, a dam main body B, a dam edge part C, a residual underwater diversion river channel D, main body type of scholars E, main body type of scholars F, non-main body scholars G, an external reservoir H and pinch-out J, setting each energy microphase color (see figure 8), and regenerating a sediment unit random phase diagram with energy microphase change.
Step four, on the basis of a random phase diagram of a deposition unit with energy microphase change in step four, firstly carrying out single-well phase judgment correction on the energy microphase generated by software according to an energy microphase logging mode, then combining a distribution scale and a material source direction, combining the same microphase according to the material source direction, drawing phase diagram boundaries of different microphase types, drawing phase diagram with plane energy attenuation change by man-machine interaction, and classifying the phase diagram into four sand types including river control residual underwater river channel type, river control wave control transition type, wave control far sand dam type and wave control coastal dam type (see figure 9).
As the conventional method is not researched according to energy change, the sand body which is relatively homogeneous is seen on the surface, the actual heterogeneity is complex, and the imbalance of dynamic effect is outstanding. The plane energy difference characterization method of the front single sand layer is applied to the eastern area of the apricot ten areas, and countermeasures such as water shutoff, fracturing, plane adjustment and the like are adopted to optimize the seepage direction and improve the development effect of plane seepage difference type residual oil formed by the large development scale of the single sand body due to energy change.
The front single sand layer plane energy difference characterization method is applied, the front single sand layer is distributed in a large-area mat shape, thin sand bodies with energy change are arranged, plane seepage difference type residual oil is easy to form, countermeasures such as water shutoff, fracturing and plane adjustment are adopted, the seepage direction is optimized, the block expansion potential is 67 well times, a scheme 33 is formulated, a water injection scheme 11 port and a water shutoff 1 port are implemented, and the thin sand bodies with different layers correspond to the precisely controlled fracturing 4 ports. After implementation, the accumulated effective oil increase is 0.38X10 4 And (3) per ton, calculating according to the technical contribution rate of 80%, directly obtaining the economic benefit 414.81 ten thousand yuan, and obtaining a better development effect.
Claims (5)
1. A front edge single sand layer plane energy difference characterization method is characterized by comprising the following steps of: the method comprises the following steps:
1) Collecting layering limit database, well position coordinate database, well deviation data, layering database and production well logging curve vectorization data of the deposition units, loading data by using oil reservoir automatic drawing software, and automatically generating random phase band diagrams of the deposition units by software through layering limit phase type and communication relation calculation;
2) On the basis of the random phase diagram of the deposition unit in the step 1), the thin layer sand on the plane is developed in a mat shape in a large area, the phase diagram of the deposition unit with energy attenuation change is selected, the lithology and logging curve difference are analyzed by using the core comprehensive diagram of the coring well, an energy microphase logging mode is established, the layered database in the step 1) is used for making an effective thickness and permeability histogram, and an energy microphase logging mode is combined to establish an energy microphase classification standard;
the step 2) of establishing an energy microphase logging mode is to utilize a coring comprehensive diagram of a core of a coring well to analyze lithology characteristics; analyzing the characteristics of the logging curve, and establishing an energy microphase logging mode according to lithology and logging curve differences;
the energy microphase logging mode categories include: the dam core part, the dam main body, the dam edge part, the residual underwater diversion river channel, main body type of sand, non-main body sand and external reservoir are in 8 microphase modes;
3) Defining a deposition microphase in oil reservoir automatic drawing software by utilizing the energy microphase classification standard in the step 2), and regenerating a random phase diagram of a deposition unit with energy microphase change by using different color characterization of each energy microphase;
4) And 3) drawing a phase diagram of the thin-layer sand with plane energy attenuation change by man-machine interaction on the basis of the random phase diagram of the deposition unit with the energy microphase change according to the sand distribution scale, the object source direction and the logging curve form, and classifying the thin-layer sand into four sand types.
2. The leading edge single sand layer plane energy difference characterization method according to claim 1, wherein: the lithology characteristics comprise granularity and argillaceous content changes; the logging curve features include microelectrode curve amplitude difference and amplitude fluctuation, natural potential negative outlier and morphological change.
3. The leading edge single sand layer plane energy difference characterization method according to claim 1, wherein: the method for establishing the energy microphase classification standard in the step 2) is to utilize the layered database in the step 1) to count lithology parameters, namely effective thickness, physical parameters, namely permeability distribution range of a single sand layer, make a histogram, determine each energy microphase distribution interval, and respectively establish the energy microphase classification standard of different sand body types by combining with an energy microphase logging mode.
4. The leading edge single sand layer plane energy difference characterization method according to claim 1, wherein: the four sand body types with plane energy attenuation change in the step 4) comprise river control residual underwater river channel type, river control wave control transition type, wave control far sand dam type and wave control coastal dam type.
5. The leading edge single sand layer plane energy difference characterization method according to claim 1, wherein: the oil reservoir automatic drawing software is GPTmap software.
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