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Shale horizontal bedding fracture density seismic prediction method

A technique for horizontal bedding and seismic prediction, applied in the field of oil geophysics

Active Publication Date: 2018-08-28
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
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Problems solved by technology

The main problem is what parameters can be inverted to express the development of horizontal bedding fractures, and how to invert to reflect the structural information inside the shale bedding

Method used

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  • Shale horizontal bedding fracture density seismic prediction method
  • Shale horizontal bedding fracture density seismic prediction method
  • Shale horizontal bedding fracture density seismic prediction method

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Embodiment 1

[0056] figure 1 It is a flow chart of a method for seismic prediction of shale horizontal bedding fracture density according to an exemplary embodiment of the present invention. The method may include the following steps:

[0057] (1) Build a rock physics model of shale horizontal bedding fracture density anisotropy.

[0058] The following key issues need to be considered for shale petrophysical equivalence:

[0059] ①Multi-scale anisotropy: description of micro-scale mineral distribution anisotropy, micro-scale matrix pore and meso-scale fracture anisotropy description, orthotropic macro-scale seismic anisotropy equivalent;

[0060] ② Full frequency band problem: frequency change interacts with fluid dynamics, that is, fluid interaction in different frequency bands;

[0061] ③Fluid filling problem: VTI anisotropy caused by horizontal slits, and dispersion and attenuation related to fluid mobility.

[0062] For the above problems, the solution of the present invention is: ...

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Abstract

The invention provides a shale horizontal bedding fracture density seismic prediction method. The method comprises the steps of (1) constructing an anisotropic rock physical model of shale horizontalbedding fracture density, (2) carrying out rock physical inversion according to logging curves based on the rock physical model and obtaining a value of the horizontal bedding fracture density and values of anisotropic parameters, (3) carrying out statistic intersection analysis on the horizontal bedding fracture density and the anisotropic parameters and establishing a prediction model, (4) estimating values of overlying shale anisotropy parameters by using the AVO attribute of an inverted shale VTI media bottom interface, and (5) converting the values of the anisotropic parameters convertedvalues of horizontal bedding fracture density to obtain a horizontal bedding fracture density seismic prediction result. Through the method, high-quality shale layer horizontal bedding fracture density plane distribution can be obtained, and the prediction of horizontal bedding fracture by using prestack seismic data is realized for the first time.

Description

technical field [0001] The invention relates to the technical field of oil geophysics, and more particularly, to a method for seismic prediction of shale horizontal bedding fracture density. Background technique [0002] Shale oil and gas reservoirs are an important field for the oil and gas exploration and development industry to expand in depth. In shale oil and gas reservoirs, horizontal bedding textured fractures are important storage spaces and drainage systems, and are of great significance to the exploration and development of shale oil and gas reservoirs, which has been confirmed in the exploration practice of shale oil and gas reservoirs in China. However, since the acquisition of exploration seismic data are all ground-stimulated surface reception, vertical fractures and high-angle fractures can be well described by lateral azimuthal anisotropy, but the azimuthal variation information of horizontal bedding fractures on the vertical plane cannot be obtained. Theref...

Claims

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Application Information

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IPC IPC(8): G01V1/00
CPCG01V1/01
Inventor 刘喜武刘宇巍刘炯霍志周张远银刘志远张金强
Owner CHINA PETROLEUM & CHEM CORP
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