Fracture developing predicting method and device

A fracture development and azimuth technology, which is applied in the field of petroleum geophysical exploration, can solve the problem of fracture development direction in difficult and thin reservoirs, and cannot overcome the non-uniqueness of direct parameter inversion.

Active Publication Date: 2017-08-15
PETROCHINA CO LTD
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Problems solved by technology

[0005] Embodiments of the present invention provide a method and device for predicting fracture development to solve the problems existing in the prior art that it is difficult t

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  • Fracture developing predicting method and device
  • Fracture developing predicting method and device

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Embodiment Construction

[0064] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0065] Such as figure 1 As shown, the embodiment of the present invention provides a method for predicting crack development, including:

[0066] Step 101, acquiring pre-stack seismic gather data, well logging data, horizon data and structural development information of the fracture study area.

[0067] Wherein, the logging data includes acoustic wave transit time curve, density curve, compressional wave velocity and shear wave velocity.

[0068] Step 102: A...

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Abstract

The invention provides a fracture developing predicting method and device, and relates to the technical field of petroleum geophysical prospecting. According to the invention, a longitudinal wave velocity azimuthal anisotropy feature based on pre-stack wide azimuth seismic data is used to predict a fracture. The method comprises the steps that according to pre-set azimuth and offset range, sub azimuth and sub offset part superposition is carried out on pre-stack seismic gather data; wavelet needed by the inversion of the azimuth superposition data body of each part is determined; a low frequency model of longitudinal wave velocity, shear wave velocity and density needed by seismic inversion is determined; pre-stack elasticity parameter data corresponding to a number of partial azimuth superposition data bodies are determined; according to a least squares method, ellipse fitting is carried out on the longitudinal wave velocity inversion data and the shear wave velocity inversion data of each partial azimuth superposition data body to determine the elliptic equation parameters of the ellipse; the long axis or minor axis orientation of the ellipse is determined to characterize the fracture development direction; and the ratio of the long axis to the minor axis of the ellipse is determined to characterize the fracture density.

Description

technical field [0001] The invention relates to the technical field of petroleum geophysical exploration, in particular to a method and device for predicting fracture development based on the anisotropic characteristics of longitudinal wave velocity of pre-stack wide azimuth data. Background technique [0002] Fractures are an important type of reservoir space in carbonate rocks, which are discontinuous surfaces without obvious displacement formed in rocks by tectonic deformation or physical diagenesis. The formation of cracks depends on the type of stress on the rock and the nature of the rock, its abundance and distribution and stress, rock type (brittle or ductile), structural state, depth (overlying pressure), lithology, rock thickness, pores Degree, phase, age and other factors. In the field of petroleum geophysical exploration, for carbonate reservoirs, fractures are not only the main pathways for oil and gas migration, but also have great significance for improving r...

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/306G01V2210/624
Inventor 闫国钰
Owner PETROCHINA CO LTD
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