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Fault interpretation method for fault block oil reservoir and structural trap identification method

A technology of fault interpretation and identification method, which is applied in the field of fault interpretation method and structural trap identification of fault-block reservoirs, which can solve the problems of uncertain fault interpretation and incorrect identification of traps, etc., so as to avoid ambiguity and uncertainty performance, and the effect of improving accuracy

Inactive Publication Date: 2020-07-31
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides a fault interpretation method for fault-block oil reservoirs, which is used to solve the problem of uncertain fault interpretation caused by the existing fault interpretation methods; the present invention also provides a structural trap identification for fault-block oil reservoirs method, used to further solve the problem of incorrectly identified traps

Method used

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  • Fault interpretation method for fault block oil reservoir and structural trap identification method
  • Fault interpretation method for fault block oil reservoir and structural trap identification method
  • Fault interpretation method for fault block oil reservoir and structural trap identification method

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Embodiment 1

[0054] This embodiment provides a method for fault interpretation of fault block reservoirs. This method uses typical examples as comparative structural models to guide structural interpretation. At the same time, corresponding structure-guided filtering is carried out to improve the signal-to-noise ratio of seismic data, making up for simple structural The ambiguity and uncertainty brought about by interpretation have improved the ability to identify faults and the rationality of fault combinations. This method can be applied to areas with developed faults, complex structures, poor seismic data quality, and conventional coherence volumes that cannot accurately describe faults.

[0055] Specifically, the flow chart corresponding to the fault interpretation method of this fault block reservoir is as follows figure 1 shown, including the following steps:

[0056] (1) Determine the study area, collect seismic data, well point information and interpretation results of predecessor...

Embodiment 2

[0074] This embodiment provides a fault interpretation method for fault-block reservoirs, and its corresponding flow chart is as follows Figure 15 shown. The difference between this method and Embodiment 1 is that after denoising the seismic data information in the study area, it is necessary to perform frequency division and coherent processing on the denoised seismic data information. The specific process is as follows:

[0075] Decompose the denoised seismic data information into a series of single-frequency volumes;

[0076] Single-frequency volumes are used to describe faults separately, and all single-frequency volumes that satisfy the set clear conditions for fault description are fused; the fused single-frequency volumes are used to interpret faults in seismic sections, and the corresponding fault description results are obtained.

[0077] Among them, in this embodiment, through screening, it is found that the 20Hz single-frequency coherent body and the 30Hz single-f...

Embodiment 3

[0079] This embodiment provides a fault interpretation method for fault-block reservoirs. The difference between this method and Embodiment 2 is that when denoising the seismic data information in the study area, the denoising method adopted is medium value filtering.

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Abstract

The invention relates to a fault interpretation method for a fault block oil reservoir and a structural trap identification method. The method comprises steps of selecting one structural style to determine a structural model corresponding to the structural style according to the structural style possibly existing in a research area; obtaining original fault interpretation according to the well breakpoint information of the research area; denoising the seismic data information of the research area, and obtaining a corresponding fault description result by using the denoised seismic data information; combining the fault description result with the original fault interpretation to obtain a new fault interpretation, judging whether the new fault interpretation conforms to the structural modelor not, if yes, taking the new fault interpretation as a final fault interpretation; otherwise, re-selecting a construction style to determine the model till the new fault interpretation conforms to the construction model. The method is advantaged in that multiplicity and uncertainty caused by structural interpretation purely depending on seismic data are avoided, and accuracy of fault interpretation is improved.

Description

technical field [0001] The invention belongs to the technical field of geographic exploration, and in particular relates to a fault interpretation method and a structural trap identification method of a fault block reservoir. Background technique [0002] With the deepening of petroleum exploration and development, structural oil reservoirs are becoming more and more difficult to find. Complex fault-block reservoirs are the main type of structural reservoirs, and their fault systems are relatively complex due to the multi-stage development of faults. In the development process of such oilfields, the accuracy of structure description is directly related to the adjustment effect of oilfield development. The key to fault description is fault identification and plane combination. Therefore, the research and application of fault identification and plane combination methods are becoming more and more important. [0003] Due to the messy seismic data events and low signal-to-nois...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/624
Inventor 张晓亮朱煜华马玉杨星庞萌李铮王树芳贾艳霞
Owner CHINA PETROLEUM & CHEM CORP
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