Analysis method of oil and gas information in rock mass

Abstract

Provided is an analysis method of oil and gas information in a rock mass. The method comprises the following steps: 1) bombarding a target rock mass, measuring corresponding reflection coefficients Rpp and incidence angles i from different incidence angles i by utilizing a demodulator and obtaining a plurality of groups of corresponding detection values of the incidence angles i and the reflection coefficients Rpp; 2) for the detection values, of which the incidence angles i are larger than phi, constructing a sample set H (x,y), wherein the x and y of each sample of the sample set meet the conditions: x=sin<2>i, and y= Rpp*cos<2>i, and the phi is a preset lower limit value of the incidence angles i in large angle gathers; 3) enabling the sample set H to carry out fitting on an equation F: y=R+Wx+Vx<2> to obtain fitted values of R, W and V; and 4) according to R=P, W=-(P-G), and V=(C-G), obtaining the values of the P, G and C, wherein the P is intercept P, the G is gradient G and C is fitted transverse wave C, and carrying out attribute analysis on the oil and gas information of the rock mass by utilizing the P, G and C. The obtained P, G and C coefficients are more accurate, and thus oil and gas information of the target rock mass is reflected more really.

Description

technical field [0001] The invention belongs to the field of geological exploration and relates to a method for analyzing oil and gas information in rock mass. Background technique [0002] AVO attribute analysis technology (Amplitude Versus Offset, the change of amplitude with offset) is a rock mass characteristic analysis technology applied in geological exploration, especially in the field of underground oil and gas resource exploration. The ratio of the reflected wave to the incident wave, that is, the response of the reflection coefficient to the change of the incident angle, is used to determine the lithological characteristics and physical parameters of the overlying and underlying medium on the reflection interface. AVO technology is a seismic exploration technology to obtain elastic parameters of rocks, analyze and identify lithology and oil and gas. [0003] The relationship between the reflection coefficient and the incident angle conforms to the Zoeppritz equati...

AI Technical Summary

Problems solved by technology

[0015] In order to overcome the technical problem of abandoning large-angle gathers in the existing technology, the solution of Poisson's ratio σ is not accurate enough, which affects the judgment of oil and gas resources in underground rock formations

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