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AVO inversion hydrocarbon detection method based on petrographic constraints

A technology of oil and gas detection and phase confinement, applied in seismic signal processing, etc., can solve problems such as large impedance difference between carbonate fracture-cavity reservoir and surrounding rock, difficulty in fluid detection, strong heterogeneity, etc.

Inactive Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art, provide an AVO inversion oil and gas detection method based on lithofacies constraints, and solve the impedance difference between the middle and lower Ordovician carbonate fracture-cavity reservoirs and surrounding rocks Large size, strong heterogeneity and difficulty in fluid detection

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  • AVO inversion hydrocarbon detection method based on petrographic constraints
  • AVO inversion hydrocarbon detection method based on petrographic constraints
  • AVO inversion hydrocarbon detection method based on petrographic constraints

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Embodiment Construction

[0055] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0056] The present invention utilizes the linear optimization AVO equation, avoids the assumed conditions of the conventional AVO approximation equation, and by adding the constraints of actual lithofacies data, makes the inversion result more adaptable to the actual geological situation, and can detect complex oil and gas reservoirs in terms of seismic response. The AVO phenomenon caused by this not only has important theoretical significance, but also has important application value for fluid detection in actual work areas.

[0057] The present invention aims at the fluid detection problem faced in the exploration and development of carbonate rock fracture-cavity reservoirs, based on (1987) The PP reflection coefficient expression established the optimal AVO equation, which overcomes the defect that only single information of seismic data is used in conventional AV...

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Abstract

The invention provides an AVO inversion hydrocarbon detection method based on petrographic constraints, and pertains to the field of fluid detection. The method comprises the following steps: (1) the elastic parameter distribution characteristic statistics is performed; (2) the Monte Carlo emulation stochastic simulation is performed; (3) pre-stack channel set pretreatment is performed on a pre-stack seismic channel set to obtain a pre-treated pre-stack channel set; (4) an incident angle channel set is formed; (5) and the optimal AVO inversion restrained by prior information is realized. The method of the invention has advantages of higher accuracy and larger application range than a conventional AVO equation, so the method of the invention is more suitable for the fluid property detection in large incident angle and strong reflecting interface conditions, and the fluid prediction accuracy can be improved.

Description

technical field [0001] The invention belongs to seismic data oil and gas detection, in particular to an AVO (amplitude versus offset) inversion oil and gas detection method based on lithofacies constraints, which can be applied to complex reservoirs, especially for fluids with strong reflection interfaces detection application. Background technique [0002] Since Ostrander (1984) proposed that the AVO method can help describe the fluid content of the reservoir, the foundation of oil and gas prediction technology based on AVO attributes has been laid. Geophysicists simplify the Zoeppritz equation from different angles to establish different forms of AVO equations to realize AVO attribute inversion and fluid detection. Smith and Gidlow (1987) combined the Aki-Richards equation to identify anomalies in seismic data indicated by hydrocarbon reservoirs using mudstone lines, forming an intercept and gradient crossplot method for fluid anomaly identification; Goodway et al. (1997)...

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Application Information

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IPC IPC(8): G01V1/28G01V1/36
Inventor 唐金良王世星周单朱克
Owner CHINA PETROLEUM & CHEM CORP
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