Method for detecting shear-wave splitting fracture

A technology of shear wave splitting and slow shear wave, applied in the field of petroleum geophysical exploration, can solve problems such as unsatisfactory

Active Publication Date: 2013-01-16
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

At present, there are many methods for realizing shear wave splitting, among which angle scanning is widely used in shear wave splitting analysis, and on this basis, cross-correlation method, ratio method and minimum energy method are formed, but these methods and means cannot meet the requirements of actual production. needs

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  • Method for detecting shear-wave splitting fracture
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  • Method for detecting shear-wave splitting fracture

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Embodiment Construction

[0039] The present invention will be described in detail below in conjunction with the accompanying drawings and examples.

[0040] The present invention collects wide azimuth three-dimensional three-component seismic data first, and obtains the radial component of the horizontal component and the azimuth angle gather data body of the transverse component by using the three-dimensional three-component seismic processing technology; carries out sub-angle superposition according to the same angular interval, and forms respectively representing different Multiple stacked data volumes of azimuth angles; use the reflection time difference between data volumes of different azimuth angles to detect the direction and density of fracture development.

[0041] Concrete steps of the present invention are as follows:

[0042] 1) In the field acquisition, the converted wave seismic data is obtained by using the wide-azimuth three-dimensional three-component seismic exploration technology, ...

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Abstract

The invention discloses a method for detecting a shear-wave splitting fracture in geophysical prospecting operation for petroleum. The method comprises the following steps of: acquiring azimuth angle gather data volumes; determining fracture development situation, and overlapping azimuth angle gather data at different angles to form a plurality of overlapped data volumes; determining an overlapped data volume as a reference azimuth data volume according to unknown work area construction and fracture characteristics; performing time difference operation on the reference azimuth data volume and other overlapped data volumes, and thus obtaining the time difference of an event; and calculating and defining other azimuth angles, extracting time difference gather data volumes, determining maximum time difference, and detecting fracture development azimuth and density. A shear-wave splitting prediction fracture theory is applied to practice, a method for quantitatively describing a fracture type reservoir is provided, and the prediction accuracy of the fracture type reservoir is improved.

Description

technical field [0001] The invention belongs to petroleum geophysical prospecting technology, in particular to the application of multi-wave seismic data and a method for detecting shear wave splitting cracks. Background technique [0002] In oil and gas exploration and development, the proportion of fractured oil and gas reservoirs is increasing, especially in carbonate rocks, igneous rocks and tight sandstones, the prediction of fractured reservoirs is very important. [0003] Well logging data can obtain relatively reliable fracture information, but this information is only valid at specific well locations. Due to the complexity of fractures, it is difficult to extrapolate interwell fracture predictions based on well results. For fractures in large areas without drilling, conventional methods rely on P-wave seismic data for prediction. Seismic attribute prediction of fractures can complete the description of large-scale fractures; P-wave azimuth anisotropy is the use of ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/00G01V1/30
Inventor 王九拴杨静邵林海刘艳娜侯艳
Owner BC P INC CHINA NAT PETROLEUM CORP
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