Method for inverting logging pore structure of sand and mudstone

A technology of pore structure and sand-mudstone, which is applied in seismology and seismic signal processing for well logging records, can solve the problems of large limitations, difficulty in application, and inconsistency of the method, and achieve the goal of improving the application range and high accuracy of results Effect

Active Publication Date: 2020-01-21
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, the existing pore structure inversion methods consider relatively simple pore structure, and the method has relatively large limitations. Different lithologies and regions adopt different model methods to invert pore structure.
Due to the complex microstructure and mineral components of sandstone and mudstone, the existing pore structure inversion methods are difficult to apply, and it is necessary to construct a suitable pore structure inversion method to provide technical support for the prediction and development of sandstone and mudstone reservoirs

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  • Method for inverting logging pore structure of sand and mudstone
  • Method for inverting logging pore structure of sand and mudstone
  • Method for inverting logging pore structure of sand and mudstone

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[0088] In this implementation, the inversion of the pore structure is carried out in combination with the actual logging data of sand and mudstone. figure 2 , image 3 It can be seen that the estimated P-wave velocity is in good agreement with the original log P-wave velocity, with an overall error of 0.5, indicating high prediction accuracy. Such as Figure 4~6 It can be seen from the distribution of the inversion results that the content of micro-cracks is less and the content of hard pores is the most, which is in line with the characteristics of sandstone and mudstone, and the inversion results are reasonable. Such as Figure 7 , Figure 8 As shown, the obtained shear wave velocity can be used in conventional well logging data analysis, combined with the pore structure inversion results to make up for the difficult problem of well logging shear wave testing, and provide help for well logging petrophysical analysis.

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Abstract

The invention discloses a method for inverting a logging pore structure of sand and mudstone, and the method is characterized by comprising the following steps of determining a rock physical model ofthe sand and mudstone; classifying the pores according to the characteristics of the pore structure of the sand and mudstone, and determining the pore structure of the sand and mudstone in combinationwith the logging data. The method provided by the invention can fully combine the actual geological characteristics of the sand and mudstone to fully consider mutual influence among respective poresby using the Mori-Tanaka equivalent medium model suitable for the lithology of the sand and mudstone, can invert the pore structure of the sand and mudstone simply and effectively with high precisionof results, and can carry out shear wave forecast, which meets the requirements of conventional logging data analysis, improves the application range, and provides help for physical analysis of logging rock.

Description

technical field [0001] The invention relates to a logging pore structure inversion method of sand and mudstone, which belongs to the field of rock physics research. Background technique [0002] Seismic rock physics methods play an important technical support role in the exploration and development of unconventional oil and gas reservoirs, and can effectively describe reservoir physical properties, complex pore structures and fluid-bearing properties. Physical properties, pore structure, and fluid are three important factors in the process of reservoir prediction and description. The influence of porosity and pore structure on rock elastic properties is one of the important aspects in rock exploration. Since the rock physics analysis method is an effective way to establish the relationship between porosity, pore structure and elastic properties, the pore inversion based on the rock physics method is reliable and has been paid more and more attention. [0003] The research m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/50
CPCG01V1/50
Inventor 王欢刘卫华沈珲李博南司文朋马中高
Owner CHINA PETROLEUM & CHEM CORP
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