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Method and device for identifying low-order faults in deep tight sandstone gas reservoirs

A tight sandstone gas reservoir and low-order sequence technology, applied in the field of petroleum exploration, can solve the problems of detection and identification of low-order sequence faults in deep tight sandstone gas reservoirs, and achieve the effect of improving reliability

Active Publication Date: 2018-02-02
PETROCHINA CO LTD
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Problems solved by technology

[0006] The present invention provides a method and device for identifying low-order faults in deep tight sandstone gas reservoirs, which are used to solve the difficulty of comprehensively analyzing the distribution of low-order faults in deep tight sandstone gas reservoirs in various existing technologies. Problems with detection and identification

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  • Method and device for identifying low-order faults in deep tight sandstone gas reservoirs

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[0045]In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0046] At present, there is no absolute scale for the division of fault grades, and the grades are often relative. In the development of oil and gas basins, according to actual needs, the definition of low-order faults is different in different regions and in different periods. The quality of seismic data is related to the resolution, which is gene...

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Abstract

The present invention provides a method and device for identifying low-order faults in deep tight sandstone gas reservoirs. The method includes: performing frequency division processing on post-stack seismic data of low-order faults to be identified, and obtaining seismic data in dominant frequency bands that can highlight low-order faults ; Perform directional filter processing on the dominant frequency band seismic data to obtain seismic data in four main directions; use the ant colony algorithm to calculate and obtain the tracking attribute body of each main direction according to the seismic data in the main direction; extract the faults of the faults in each main direction Traces, combined with tracking attribute volumes in each direction to obtain system diagrams, through frequency division and filtering of relatively poor quality post-stack seismic data, and recalculation using ant colony algorithm on the basis of the original ant volumes, Extract accurate fault traces and combine them with tracking attribute volumes in each direction to obtain system diagrams, which are applicable to seismic data of various mechanical properties and frequencies, and effectively improve the reliability of identification of low-order sequence faults.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a method and device for identifying low-order sequence faults in deep tight sandstone gas reservoirs. Background technique [0002] Tight sandstone gas reservoirs have unconventional geological features, such as strong reservoir diagenetic compaction, low porosity and low permeability, high content of clay minerals, low water saturation, abnormal formation pressure, etc., but few people mention the key role of the fault system. Due to the characteristics of bottom water or edge water in deep gas reservoirs, after the formation pressure changes, the fluid is easy to coning along the fault and cause water intrusion in the gas reservoir. Both will directly or indirectly lead to large differences in single well productivity and the risk of water breakthrough in production wells, which will affect the development benefits of gas reservoirs. [0003] With the continuous ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 江同文朱忠谦昌伦杰吴永平冯建伟郑广全冉丽君孟学敏胡素明孙致学张杰孙勇白晓佳王焰东杨敏
Owner PETROCHINA CO LTD
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