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A method for identifying hidden faults in complex fault-block basins

A complex fault block and concealment technology, applied in the field of petroleum exploration and development, can solve the problems of poor identification ability of concealed faults

Active Publication Date: 2021-09-17
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for identifying hidden faults in complex fault-block basins, so as to solve the problem of poor ability to identify hidden faults in complex fault-block basins

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  • A method for identifying hidden faults in complex fault-block basins
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  • A method for identifying hidden faults in complex fault-block basins

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Embodiment Construction

[0026] The embodiments of the present invention will be further described below in conjunction with specific examples.

[0027] A specific embodiment of the method for identifying hidden faults in complex fault-block basins of the present invention, the flow chart is as follows figure 1 As shown, the following steps are taken:

[0028] 1) Drilling petrophysical analysis of the Wangji area in the Biyang sag shows that the velocity of the sandstone and mudstone in this area gradually increases with the buried depth. It is 2500-4500m / s. In the depth range of 1200-1800m, the velocities of sandstone and mudstone can be clearly distinguished, but below the depth of 1800m, the velocities of sandstone and mudstone begin to mix and are difficult to distinguish (such as figure 2 shown).

[0029] Based on the stratum structure characteristics of the Wangji area, 6 groups of geological models with different stratum structures and different fault distances were designed according to th...

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Abstract

The invention relates to a method for identifying hidden faults in complex fault-block basins. The identification method includes the following steps: 1) establishing a stratum model based on rock physical parameters, performing forward modeling on the stratum model, and determining geological factors that affect the identification of hidden faults ; According to the formation and fault occurrence in the target area, determine the principal stress direction, adjust the survey line direction of the seismic data to be perpendicular to the principal stress direction, and obtain the seismic data body; 2) perform fault enhancement processing on the seismic data volume; 3) extract fault enhancement Variance attribute of seismic data volume; 4) Occurrence constraint filtering is performed on variance attribute, and then merged with fault-enhanced seismic data volume, and hidden faults are identified according to the fusion result. The method for identifying hidden faults in complex fault-block basins provided by the present invention solves the problem of identifying small-scale hidden faults mixed with formation factors through steps such as fault enhancement processing, extraction of variance attributes, and occurrence constraint variance attributes.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration and development, and in particular relates to a method for identifying hidden faults in complex fault-block basins. Background technique [0002] With the continuous deepening of oil and gas exploration and development in continental basins in my country, the understanding of large structures and large faults has gradually become clear, and the degree of influence of micro-amplitude structures and subtle faults on oil and gas exploration and development is increasing. These hidden faults are often difficult to identify on the seismic section due to their small scale or the quality of seismic data, which seriously restricts the process of oil and gas exploration and development. [0003] In recent years, with regard to the frontier subject of research on concealed fault identification technology in complex fault-block basins, researchers have made a lot of in-depth discussions and ben...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
CPCG01V1/306
Inventor 宋灿灿熊健付江娜刘峥君张聪郭佳玉杨卫琪
Owner CHINA PETROLEUM & CHEM CORP
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