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Method for distribution prediction of tectonically-deformed coal based on pre-stack simultaneous inversion

A technology for distribution prediction and tectonic coal, which is applied in the field of coalfield seismic exploration, can solve the problems that tectonic coal cannot be satisfied, and cannot distinguish primary coal and tectonic coal well, and achieve the effect of accurate prediction.

Inactive Publication Date: 2017-06-23
师素珍
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Problems solved by technology

In terms of prediction of structural coal distribution area, the wave impedance information provided by post-stack longitudinal wave impedance inversion cannot distinguish primary coal from structural coal well, which can no longer meet the requirements of structural coal prediction

Method used

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  • Method for distribution prediction of tectonically-deformed coal based on pre-stack simultaneous inversion
  • Method for distribution prediction of tectonically-deformed coal based on pre-stack simultaneous inversion
  • Method for distribution prediction of tectonically-deformed coal based on pre-stack simultaneous inversion

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Embodiment Construction

[0017] The specific implementation process of the present invention will be described in detail below in conjunction with specific drawings.

[0018] figure 1 Shown is a flowchart of an embodiment of a method for predicting structural coal distribution based on pre-stack synchronous inversion of the present invention.

[0019] The following will combine figure 1 As shown, an embodiment of the method for predicting structural coal distribution based on pre-stack synchronous inversion of the present invention is described in detail, which includes:

[0020] Step 101: Construct a forward model for primary coal and structural coal. Through the intersection of λρ-μρ, the change from primary coal to structural coal causes the values ​​of λρ and μρ to become smaller and smaller. Therefore, as the degree of fragmentation increases, λρ and μρ The values ​​all become lower;

[0021] Step 102: Construct a forward model for primary coal and structural coal, and obtain a smaller Zp and larger Vp / V...

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Abstract

The invention provides a method for distribution prediction of tectonically-deformed coal based on pre-stack simultaneous inversion. The method comprises: the step of obtaining the change of rock elastic parameters of the tectonically-deformed coal by employing forward modeling intersection; the step of converting an offset domain CRP gather to an incident angle domain and performing divisional superposition; the step of extracting wavelets from each partial superposed data volume and performing interpolation of the wavelet corresponding to any incident angle; the step of constructing an initial model; the step of conducting an inversion analysis at a known well point to calculate inversion parameters; and the step of performing pre-stack simultaneous inversion to obtain the rock elastic parameters and predict the distribution of the tectonically-deformed coal.

Description

Technical field [0001] The invention belongs to the field of coalfield seismic exploration, and specifically relates to a method for predicting structural coal distribution based on pre-stack synchronous inversion. Background technique [0002] With the continuous deepening of coal mining depth, the requirements for coal field 3D seismic exploration technology are getting higher and higher. Regarding the prediction of structural coal distribution areas, the wave impedance information provided by the post-stack P-wave impedance inversion cannot distinguish between primary coal and structural coal, and cannot meet the requirements of structural coal prediction. The pre-stack synchronous inversion technology comprehensively utilizes the pre-stack incident angle seismic data for simultaneous inversion, and obtains the three basic elastic parameters of longitudinal wave velocity, shear wave velocity and density. Starting from these three basic parameters, more elastic parameters (Poi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/6242
Inventor 师素珍
Owner 师素珍
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