Crack prediction method for preferred orientation daughter coherence

A fracture prediction and optimal azimuth technology, applied in the field of oilfield exploration, can solve the problems of obliterating the azimuth direction of fracture development, missing seismic azimuth angle, missing azimuth data, etc., and achieve the effect of enriching fracture development information and clear fracture development distribution map

Active Publication Date: 2016-03-30
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] At present, the method of using seismic coherence technology to identify fractures is often based on post-stack seismic data, and the main problem faced by post-stack seismic data is the lack of azimuth data. Azimuth angle, the obtained seismic coherence result is also the result...

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  • Crack prediction method for preferred orientation daughter coherence
  • Crack prediction method for preferred orientation daughter coherence
  • Crack prediction method for preferred orientation daughter coherence

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Embodiment Construction

[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings:

[0044] Research on detecting cracks with seismic coherence started a long time ago. Aiming at the problem of natural fractures existing in actual oil and gas field exploration, the present invention designs a method of using pre-stack seismic gathers to generate azimuth sub-bodies, carry out sub-azimuth coherent calculation, and then optimize the coherent calculation results of sub-azimuth to develop an optimal azimuth The subvolume-related fracture detection method can be applied to the prediction of fractured oil and gas reservoirs in oilfield exploration.

[0045] The present invention proposes a method for generating azimuth sub-bodies by using pre-stack seismic gathers and calculating coherence attributes respectively, and finally detecting faults and cracks through an algorithm with the largest azimuth optimization. The new algorithm calculates the coherenc...

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Abstract

The invention provides a crack prediction method for the preferred orientation daughter coherence, and belongs to the field of oilfield exploration. The method generates orientation daughters through a pre-stack seismic channel set, and then calculates coherence attributes among different orientations, and finally acquires a seismic data coherence body of the preferred orientation. The method includes: (1) pre-treatment of pre-stack seismic data; (2) extraction of a macro surface element channel set; (3) stacking branch orientation full migration distance channel sets to form the orientation daughters; (4) calculating seismic orientation daughter coherence to form orientation coherence daughters; and (5) calculating the maximum orientation coherence daughter to obtain the seismic data coherence body of the preferred orientation.

Description

Technical field [0001] The invention belongs to the field of oilfield exploration, and specifically relates to a fracture prediction method with sub-body coherence in an optimal azimuth. Background technique [0002] Natural fractures play an important role in petroleum exploration because there are fractures in almost every reservoir, rock type, and depth. Identifying these fractures and identifying the direction of the fractures can help prospectors better understand the reservoir. The size of underground fractures is diverse. The fractures below 10 meters below the seismic magnitude are of great interest to everyone in the description of the reservoir. It is important for geophysicists to determine the maximum fracture density area or determine the orientation of these fractures in the reservoir. It is an important technical challenge. [0003] Since the appearance of the coherence cube as an attribute of seismic data for calculating seismic coherence, the research on using se...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 梁志强王世星张克非肖鹏飞
Owner CHINA PETROLEUM & CHEM CORP
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