Carbonate rock fracture-cavity type oil reservoir geological modeling method

A carbonate rock and geological modeling technology, applied in 3D modeling, earthwork drilling, image data processing, etc., can solve the problem of not fully considering the karst background, not considering the fusion and correction of classified reservoirs, and not having three-dimensional geological models. It can fully characterize the characteristics of carbonate fracture-cavity reservoirs, etc., and achieve the effect of improving the accuracy of quantitative characterization

Active Publication Date: 2020-09-01
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0012] However, in fact, the fractured-vuggy reservoirs in the reservoir do not exist in isolation, and there are different genetic associations and distribution rules among the reservoirs in different karst genetic backgrounds. The characteristics of fractured-vuggy reservoirs are characterized by a unified method, and the constraint methods and simulation algorithms cannot be designed separately for fractured-vuggy reservoirs with different karst backgrounds. Different methods are not considered for the fusion and correction of classified reservoirs. The 3D geological model of the company cannot fully characterize the characteristics of carbonate fracture-cavity reservoirs, and cannot provide a reliable basis for oilfield development

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  • Carbonate rock fracture-cavity type oil reservoir geological modeling method
  • Carbonate rock fracture-cavity type oil reservoir geological modeling method
  • Carbonate rock fracture-cavity type oil reservoir geological modeling method

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Embodiment 1

[0185] Taking the R1 reservoir as an example, the R1 reservoir is a fracture-vuggy reservoir with multiple composite origins, including surface karst, ancient underground river pipeline system and fault-controlled karst. Carry out modeling according to the method of the present invention, as Image 6 Shown is the surface karst modeling results mainly controlled by weathering denudation and leaching karst in R1 reservoir; Figure 7 Shown is the modeling result of the underground river pipeline system in the R1 reservoir, which is mainly controlled by the fluctuation of the water table; Figure 8 Shown are the fault-controlled karst modeling results controlled by major faults in the R1 reservoir; Figure 9 Shown is the reservoir modeling result after fusion in R1 reservoir; Figure 10 Shown is the optimized porosity modeling result in R1 reservoir; Figure 11 According to the model for the first history fitting curve, the matching rate is over 85%, reflecting the accuracy and...

Embodiment 2

[0187] Taking the R2 reservoir as an example, the R2 reservoir is a fracture-vuggy reservoir dominated by faults controlling karst, and its reservoir development model is as follows: Figure 12 As shown, modeling is carried out according to the method of the present invention, Figure 13 It is the modeling result of discontinuity-controlled karst cave reservoir in R2 reservoir; Figure 14 It is the modeling result of discontinuity-controlled dissolution vug reservoir in R2 reservoir; Figure 15 is the modeling result of the fracture equivalent model in R2 reservoir; Figure 16 is the reservoir modeling result after fusion in R2 reservoir; Figure 17 is the optimized porosity modeling result in R2 reservoir; Figure 18 It is the first historical fitting curve of oil production in R2 reservoir, with a coincidence rate of more than 90%, reflecting the consistency between the model and dynamic data.

[0188]The geologic modeling method of carbonate fractured-vuggy reservoirs o...

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Abstract

The invention provides a carbonate rock fracture-cavity type oil reservoir geological modeling method. The method comprises: fully considering the karst genetic type of the fractured-vuggy reservoir;according to different karst genetic types, respectively determining reservoir types and distribution rules, using different modeling algorithms for simulating different types of reservoirs, constructing classified reservoir models under different karst genetic backgrounds, fusing the classified reservoirs under different genetic backgrounds by adopting different fusion methods, and optimizing a geological model on the basis of various production dynamic data. By means of the method, the three-dimensional geological model conforming to the static data and the dynamic data can be obtained, thecharacterization precision of the strong heterogeneous characteristics of the fractured-vuggy oil reservoir can be improved, and a reliable geological basis is provided for oil reservoir development.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a geological modeling method for carbonate rock fracture-cavity reservoirs based on karst origin. Background technique [0002] The main storage spaces of fractured-cavity carbonate reservoirs are various large-scale dissolved caves and dissolved vugs. There are also fractures of various scales in the reservoir, which mainly play the role of diversion, but isolated caves and fractures are relatively large. There are various relationships between reservoirs, most of which exist in the form of fracture-cave combinations. In the process of characterization of fractured-vuggy reservoirs, in order to express the characteristics of the large size and scale differences between different reservoirs, the method of classification and characterization of reservoirs is often used. The current classification and characterization methods mostly focus on qualitative geoph...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G06T17/05E21B43/26
CPCG06T17/05E21B43/26Y02A10/40
Inventor吕心瑞孙建芳李红凯魏荷花肖凤英
OwnerCHINA PETROLEUM & CHEM CORP