Fault sealing evaluation method for extracting static quality coefficient through well logging

Abstract

The invention discloses a fault sealing evaluation method for extracting a static quality coefficient through well logging, and particularly relates to the field of oil and gas resource geological exploration and development evaluation. The evaluation method comprises the following steps: 1, carrying out spectrum attribute, wavelet attribute and integral attribute analysis on conventional loggingdata passing through a fault zone, and carrying out sensitive attribute parameter optimization at the same time; 2, combining the selected fault zone structure logging attribute parameters with parameters capable of representing the fracture development degree, and constructing fault zone structure division parameters; 3, representing a fault plugging correlation coefficient and a fault zone structure division parameter by using logging information of the research block to obtain a static quality coefficient S extracted by logging; and 4, obtaining a standard for judging the fault sealing performance of the research block based on the S coefficient extracted by the logging attribute. According to the method, the influence of the fault internal structure on the fault sealing performance isconsidered, the influence of the fault sealing performance is solved to a certain extent, and the method has practical significance for well logging evaluation reservoir and oil field development of complex fault block oil and gas fields.

Description

technical field [0001] The invention relates to the field of geological exploration and development evaluation of oil and gas resources, in particular to a fault sealing evaluation method for extracting static quality coefficients from well logging. Background technique [0002] Fault structure is a basic structural type widely developed in the crust, which can appear in the form of rupture surface (or sliding surface) or in the form of fault zones with different widths. Most of the known oil and gas-bearing structures in my country's petroleum-bearing basins are associated with a large number of faults, and most of them appear in the form of fault zones (Fan Jichang et al., 2007). Fault structure is one of the main structural deformation patterns in petroleum basins, and it has dual functions in oil and gas migration and accumulation, which can be either transport or seal. Scholars at home and abroad have analyzed the role of faults in the process of oil and gas migration ...

AI Technical Summary

Problems solved by technology

However, in the previous fault sealing evaluation process, the fault sealing coefficient did not take into account the influence of the internal structure, which affected the accuracy of the fault sealing evaluation to a certain extent.

[0006] At present, the research methods of fault zone structure include seismic, well logging, geology, and rock core, while the survey accuracy of geological and seismic research is from 10m to several thousand meters, the accuracy of core survey is between 1mm-10cm, and the survey accuracy of well logging can be Reaching the centimeter level, it has well filled the range of survey accuracy, but at present, the application of logging data to the study of fault zone structure is still in the qualitative analysis stage

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