Converted wave extreme attribute hydrocarbon detection method

A technology of oil and gas detection and converted wave, which is applied in the direction of seismic signal processing, etc., can solve the problems of low AVO inversion accuracy, low signal-to-noise ratio and poor stability of converted wave data, so as to avoid jitter, improve fitting accuracy, and improve The effect of precision

Inactive Publication Date: 2015-06-03
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] When the longitudinal wave is vertically incident, the reflection coefficient of the converted wave is zero. As the incident angle increases, the reflection coefficient increas...

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  • Converted wave extreme attribute hydrocarbon detection method
  • Converted wave extreme attribute hydrocarbon detection method
  • Converted wave extreme attribute hydrocarbon detection method

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[0037] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0038] In the retrieved domestic literature, the approximate formula of converted wave AVO has higher accuracy only in the range of short offset (small incident angle), and the approximate error of converted wave AVO is relatively small in the range of large offset (large incident angle). Due to the limitation of the accuracy range of the converted wave AVO approximation formula, the converted wave AVO inversion needs to limit the converted wave data to a small angle range. Unlike the characteristics of longitudinal wave AVO, when the longitudinal wave is vertically incident, the reflection coefficient of the converted wave is zero, and as the incident angle increases, the reflection coefficient increases; when the incident angle reaches a certain angle (medium incident angle), the converted wave reflection The coefficient reaches an extreme value; then as the inciden...

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Abstract

The invention provides a converted wave extreme attribute hydrocarbon detection method, which belongs to the field of hydrocarbon geophysics. The method includes the following steps: (1) a converted wave common conversion point gather is inputted; (2) velocity analysis and dynamic correction are carried out for the common conversion point gather, so that a dynamically corrected gather is formed; (3) longitudinal wave and transverse wave velocity fields are inputted, the angles of converted wave incidence are tracked by a ray, and a converted wave angle gather is formed; (4) the power function y equal to ax plus cx fitting of amplitude versus angle is carried out for a converted wave amplitude sequence at the same time sampling point and different angles of incidence point by point, and an extreme position and extreme amplitude are outputted; (5) a velocity ratio Gamma is obtained by inversion; (6) a transverse wave reflection coefficient Rss0 is inverted; (7) according to a reservoir gas-bearing velocity ratio decrease principle, the gas-bearing property of a reservoir is predicted by means of the velocity ratio Gamma obtained by inversion. The method utilizes high-signal-to-noise-ratio data within an offset range nearby the extreme amplitude, and increases the precision of converted wave AVO (Amplitude Variation with Offset) inversion.

Description

technical field [0001] The invention belongs to the field of oil and gas geophysics, and in particular relates to a method for detecting oil and gas with converted wave extreme value attributes. Background technique [0002] In recent years, the relationship between seismic reflection amplitude and offset variation (AVO) has become a hot spot in the research of geophysical prospecting technology. With the development of multi-component seismic exploration technology, the research on converted wave AVO technology has attracted more attention. The change of reflection coefficient with incident angle itself implies the information of elastic parameters, and the density, P-wave velocity and S-wave velocity of rock can be directly inverted by using AVO characteristics, and seismic reservoir description can be quantitatively carried out. Zoeppritz (1919) derived the Zoeppritz equation describing the displacement-amplitude relationship between the incident wave, reflected wave, and...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 魏修成陈天胜季玉新刘韬刘春园刘炯张雅勤
Owner CHINA PETROLEUM & CHEM CORP
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