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Method for analyzing oil gas information of rock body by applying amplitude versus offset (AVO) large-angle trace gathers

A large-angle, rock-mass technology, applied in the field of geological exploration, can solve problems that affect the judgment of oil and gas resources in underground rock formations, and the solution is not accurate enough to achieve the effect of eliminating theoretical errors and accurate coefficients

Active Publication Date: 2013-01-09
成都晶石石油科技有限公司
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Problems solved by technology

[0015] In order to overcome the abandonment of large-angle gathers in the prior art, resulting in Poisson's ratio The solution is not accurate enough, which affects the technical problems of judging the oil and gas resources of underground rock formations

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  • Method for analyzing oil gas information of rock body by applying amplitude versus offset (AVO) large-angle trace gathers
  • Method for analyzing oil gas information of rock body by applying amplitude versus offset (AVO) large-angle trace gathers
  • Method for analyzing oil gas information of rock body by applying amplitude versus offset (AVO) large-angle trace gathers

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Embodiment Construction

[0038] For better illustrating the realization purpose and principle of the present invention, write Shuey equation again:

[0039] ------①

[0040] in ,

[0041]

[0042] Here R PP is the reflection coefficient, i is the incident angle, V P is the longitudinal wave amplitude, ρ is the rock mass density at shot point, ΔV P / V P , Δρ / ρ represent the rate of change of P-wave and the rate of change of rock mass density, respectively.

[0043] The traditional method discards the large-angle gather, that is, the third item on the right side of the equal sign in equation ①, and uses the simplified Shuey binomial

[0044] -------②

[0045] Use formula ② to collect the reflection coefficients of small and medium angles of incidence, and obtain the coefficients of the simplified Shuey binomial formula ② through mathematical analysis, and formula ② is abbreviated as:

[0046] ,in

[0047] After calculating the intercept P and gradient G, calculate the Poisson'...

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Abstract

The invention discloses a method for analyzing oil gas information of the rock body by applying amplitude versus offset (AVO) large-angle trace gathers, which comprises the following the steps of: 1, processing denoising, dynamic correction, stretching and the like of data recorded by drift earthquake, recording reflection coefficients Rpp and incidence angles i, and acquiring a plurality groups of detection values corresponding to incidence angle i and the reflection coefficient Rpp; 2, constructing a sample set H (x, y) of all detection values of incidence angles i larger than 30, wherein the sample set in each sample, i and Rpp are the incidence angles and corresponding reflection coefficients Rpp obtained in the step 1; 3, fitting equation F by using the sample set H to obtain fitting values of R, W and V; and 4, calculating the obtained P, G and C by substituting the R, W and V obtained in the 2, and performing attributive analysis of the rock body oil gas information. According to the method, AVO of the incidence angle large-angle trace gathers is analyzed, theoretical error existing prior to Shuey equation fitting is eliminated, the obtained P, G and C are more accurate, and the oil information of the target rock body is more really reflected.

Description

technical field [0001] The invention belongs to the field of geological exploration and relates to a method for analyzing rock mass oil and gas information by using AVO large-angle gathers. Background technique [0002] AVO attribute analysis technology (Amplitude Versus Offset, the change of amplitude with offset distance) 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 that obtains the elastic parameters of rocks to analyze and identify lithology and oil and gas. [0003] The relationship between the reflection coefficient and the...

Claims

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Application Information

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IPC IPC(8): G01V1/30
Inventor 刘力辉
Owner 成都晶石石油科技有限公司
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