Analysis method of oil and gas information in rock mass

An analysis method and technology of rock mass, applied in the field of analysis of oil and gas information in rock mass, can solve the problems of inaccurate solution of Poisson's ratio σ and affect the judgment of oil and gas resources in underground rock formations, and achieve the effect of eliminating theoretical errors and accurate coefficients

CN104965226AInactive Publication Date: 2015-10-07CHENGDU GAOPU PETROLEUM ENG TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2015-10-07
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0031] The present invention will be described in further detail below in conjunction with the examples, but the embodiments of the present invention are not limited thereto.

[0032] The analysis method of oil and gas information in the rock mass of the present invention comprises the following steps:

[0033] (1) shelling the target rock mass, using a geophone to measure the corresponding reflection coefficient Rpp and the incident angle i at different incident angles i, and obtaining the detection values ​​of several groups of corresponding incident angles i and reflection coefficient Rpp;

[0034] (2) Construct a sample set H(x, y) for all detected values ​​whose incident angle i is greater than Φ; where x=sin of each sample in the sample set 2 i,y=R pp *cos 2 i; Φ is the preset lower limit value of the incident angle i in the large-angle gather; the value of Φ is preferably set to 45 degrees.

[0035] (3) Make sample set H pair equation F: y=R+Wx+Vx 2 Perform fitting ...