Pre-stack seismic data based fracture-reservoir rapid prediction method
A fractured reservoir and pre-stack seismic technology, applied in the field of oil and gas geophysics, can solve the problems of high construction cost, complex implementation process, and difficult data processing, and achieve the effect of wide application range and fast implementation process
Inactive Publication Date: 2017-05-31
CHENGDU UNIVERSITY OF TECHNOLOGY
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[0004] The purpose of the present invention is to provide a fast prediction method for fractured reservoirs based on pre-stack seismic data, aiming to solve the problem of complex implementation process, limited fitting ellipse and high construction cost in the existing fracture prediction method based on pre-stack seismic data , the problem of difficult data processing
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[0041] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0042] The application principle of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0043] Such as figure 1 As shown, the method for rapid prediction of fractured reservoirs based on pre-stack seismic data provided by the embodiment of the present invention includes the following steps:
[0044] S101: According to the quality of the pre-stack seismic data, first use the combined optimization technology of "denoising-flattening-cutting" to process the seismic data;
[0045] S102: Perform polynomial fitting of quadratic or above on the amplitude value of the optimized...
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The invention discloses a pre-stack seismic data based fracture-reservoir rapid predication method. According to quality of pre-stack seismic data, seismic data is processed by adopting combinatorial optimization of denoising, leveling and removing, amplitude values of gathers of a certain time point are fitted on the gathers subjected to optimizing process, and the average value of the amplitude values of the gathers serving as homogeneous media is subtracted from fitted values of the gathers of the time point to acquire difference values of the gathers; standard deviation of the difference values is calculated to serve as an abnormal value, and fracture reservoir development strength can be effectively represented by using the abnormal value; the sampling rate is taken as step length to move the time point to acquire an abnormal value data body of entire seismic data. The rapid prediction method is rapid and effective; the fracture reservoir prediction analysis technique is independent of being fitted to specially-shaped ellipse, and the problem about seismic data fracture reservoir prediction in narrow azimuth is solved.
Description
technical field [0001] The invention belongs to the technical field of oil and gas geophysics, in particular to a fast prediction method for fractured reservoirs based on pre-stack seismic data. Background technique [0002] According to the collected seismic data, the existing fracture prediction technology based on pre-stack seismic data can be divided into two types: the fracture prediction method for wide-azimuth pre-stack seismic data and the fracture prediction method for narrow-azimuth pre-stack seismic data: ( 1) For prediction of wide-azimuth prestack seismic fractures, most scholars at home and abroad use ellipse fitting technology based on P-wave anisotropy seismic attributes, such as Grechka and Tsvankin et al. The dynamic correction time difference ellipse fitting of velocity change is used to predict the fracture tendency with depth; Qu Shouli et al. (2001) proposed a method to detect fractures based on the change of impedance with azimuth; Gray (2004) proposed...
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IPC IPC(8): G01V1/30
CPCG01V1/307
Inventor 熊晓军简世凯李翔刘阳龚思宇崔泽飞
Owner CHENGDU UNIVERSITY OF TECHNOLOGY