Igneous rock open-fracture earthquake prediction method

A technology of earthquake prediction and igneous rock, applied in seismology, geophysical measurement, seismic signal processing, etc., can solve problems such as unclear understanding of seismic attribute correspondence, limited resolution of seismic data, etc., to achieve convenient and fast prediction and calculation small effect

Pending Publication Date: 2017-05-31
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, limited by the resolution of seismic data, open fractures are not clearly reflec

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  • Igneous rock open-fracture earthquake prediction method
  • Igneous rock open-fracture earthquake prediction method
  • Igneous rock open-fracture earthquake prediction method

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[0022] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.

[0023] Due to the larger fracture width, the existence of open fractures is more likely to cause changes in seismic reflection characteristics than closed fractures, resulting in responses in amplitude, frequency, phase, and waveform of post-stack seismic data. By extracting seismic attributes, it is possible to highlight or Amplify these seismic responses. However, seismic attributes have multiple solutions, and there are also interrelationships among some attributes. In order to solve these problems, the present invention uses statistical methods to determine the relationship between seismic attributes and open fractures, so as to realize earthquake prediction for open fracture development zones.

[0024] Such as figure 1 as shown, figure 1 It is a...

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Abstract

The invention provides an igneous rock open-fracture earthquake prediction method. The method comprises steps of step 1, through analysis of the FMI imaging logging, counting density of open fractures of a depth segment; step 2, carrying out refined synthesis earthquake recording calibration; step 3, by analyzing response features of the fractures on the earthquake recording, using post-stack earthquake data to extract earthquake attribute bodies; step 4, establishing a corresponding relation between the density of the open fractures and the earthquake attributes and using well point data to calibrate the earthquake attributes; step 5, by using the corresponding relation on well points, calculating distribution of density of the open fractures in a non-well control region, and establishing a fracture skeleton module; and step 6, carrying out open fracture density calibration on a new well and carrying out verification and correction on the prediction precision. According to the invention, the information included by the post-stack earthquake data can be fully used for analyzing earthquake response caused by open fracture development zones, and precisely predicting the open fracture development zones.

Description

technical field [0001] The invention relates to the field of oil field development seismic research, in particular to a seismic prediction method for igneous rock opening fractures. Background technique [0002] Fracture is one of the key factors controlling the development effect of igneous rock reservoirs, and the identification and prediction of open fractures has important practical value for oil and gas exploration. Open fractures are of great significance for oil and gas storage and migration in igneous rock reservoirs, and are closely related to the reserve scale of igneous rock reservoirs. However, limited by the resolution of seismic data, open fractures are not clearly reflected in seismic data, and the corresponding relationship with seismic attributes is unclear. How to use post-stack data to predict open fractures has always been an important problem for geophysicists. For this reason, we have invented a new earthquake prediction method for opening fractures i...

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Application Information

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IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/306G01V1/307G01V2210/6169G01V2210/624G01V2210/63
Inventor 吕世超王伟曹刚苗明李敬巴志明乌洪翠解伟吴志华曲全工王筱文钱克兵李辉张德武
Owner CHINA PETROLEUM & CHEM CORP
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