Method and device for recognizing low-grade fault of deep tight sandstone gas reservoir

A tight sandstone gas reservoir and low-order sequence technology, which is 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: 2016-08-17
PETROCHINA CO LTD
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[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 com

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  • Method and device for recognizing low-grade fault of deep tight sandstone gas reservoir

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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 invention provides a method and a device for recognizing a low-grade fault of a deep tight sandstone gas reservoir. The method comprises steps: frequency division processing is carried out on post stack seismic data of a to-be-recognized low-grade fault, and dominant frequency band seismic data capable of highlighting the low-grade fault can be acquired; directional filtering processing is carried out on the dominant frequency band seismic data to acquire seismic data in four main directions; according to the seismic data in the main directions, an ant swarm algorithm is adopted to calculate and acquire a tracing attribute volume in each main direction; and fault traces of the fault in each main direction are extracted, and the tracing attribute volume in each direction is combined to acquire a system diagram. Through carrying out frequency division processing and filtering processing on the post stack seismic data with a relatively poor quality and adopting the ant swarm algorithm again for recalculation on the basis of the original ant swarm, accurate fault traces are extracted, the tracing attribute volume in each direction is combined to acquire the system diagram, the method and the device of the invention are applied to seismic data with various mechanical properties and frequencies, and recognition reliability on the low-grade fault can be effectively improved.

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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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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