Carbonate rock fault-karst body internal structure characterization method

A technology of internal structure and carbonate rock, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as inability to describe the degree of fragmentation, comprehensive prediction of reservoirs, and large differences in the value range of the description results

Active Publication Date: 2017-11-24
CHINA PETROLEUM & CHEM CORP
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Problems solved by technology

However, it is impossible to characterize the degree of fragmentation of the fracture;
[0007] (4) Use tensor attributes to calculate the discontinuity of underground space (Li Yi et al., Application of Gradient Structure Tensor Analysis Method in the Prediction of Channel Sand Body from 3D Seismic Data, Natural Gas Industry, 2011), and combine with the above-hole da

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  • Carbonate rock fault-karst body internal structure characterization method
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[0040] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0041] figure 1 Shown is a flow chart of a method for characterizing the internal structure of a carbonate fault-karst body according to the present invention, the method comprising the following steps:

[0042] Step S101: Post-stack inversion is performed on the seismic data to obtain subsurface wave impedance data, the purpose of which is to characterize the reservoir body of the carbonate rock fault-karst body.

[0043] Optiona...

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Abstract

The invention discloses a carbonate rock fault-karst body internal structure characterization method which comprises the following steps: seismic data is subjected to post-stack inversion, and underground wave impedance data is obtained; a wave impedance data threshold value representing fracture-vug type reservoir body development is determined, and the underground wave impedance data is subjected to hollow-out engraving operation according to the wave impedance data threshold value; tensor attributes of the seismic data are calculated and subjected to spatial smoothing processing, a tensor attribute threshold value representing a broken area of the fault-karst body is determined, a tensor attribute spatial smoothing processing result is processed according to the tensor attribute threshold value, a contour of the fault-karst body can be obtained and used as a boundary, the tensor attributes and the underground wave impedance data are displayed in the contour, and therefore an external contour of the fault-karst body can be carved and an internal structure of the fault-karst body can be represented. According to the carbonate rock fault-karst body internal structure characterization method, comprehensive characterization of the carbonate rock fault-karst body can be realized via graph overlaying technologies, and a boundary of a fault-karst body oil reservoir and spatial distribution of a reservoir body can be carved out.

Description

technical field [0001] The invention relates to a development seismic method in oil reservoir development, in particular to a characterization method for the internal structure of carbonate rock fault-karst bodies. Background technique [0002] The storage space of fault-karst reservoirs is dominated by large caves or dissolved pores and caves. Affected by the development of karst water and faults, the internal structure of fault-karst reservoirs is extremely complex, and the vertical and horizontal heterogeneity of storage space is extremely strong. The structural separation is obvious, and the same fault zone has a large difference in reservoir filling due to different degrees of fragmentation, which poses a great challenge to subsequent reservoir prediction and reservoir modeling. [0003] The current fault-karst reservoir characterization methods are mainly divided into the following categories: [0004] (1) Using amplitude change rate technology to predict reservoirs o...

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Application Information

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IPC IPC(8): G01V1/28G01V1/36
CPCG01V1/282G01V1/362
Inventor 文欢王震邓光校鲍典张娟罗君兰
Owner CHINA PETROLEUM & CHEM CORP
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