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Method and system for quickly identifying lithology based on cross plot method

A technology of intersection map and lithology, which is applied in the field of oil and gas exploration, can solve the problems of low recognition degree, inability to achieve fine identification of lithology, and a large amount of time data processing of the direct intersection map method, so as to reduce data errors and achieve high discrimination Effect

Active Publication Date: 2020-07-28
CHENGDU UNIVERSITY OF TECHNOLOGY
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AI Technical Summary

Problems solved by technology

[0005] 1. The intersection graph method adopts conventional logging series curves, which has a low degree of recognition, and cannot meet the standard for finely identifying lithology
[0006] 2. The direct intersection graph method requires a lot of time for data processing

Method used

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  • Method and system for quickly identifying lithology based on cross plot method
  • Method and system for quickly identifying lithology based on cross plot method
  • Method and system for quickly identifying lithology based on cross plot method

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Embodiment 1

[0064] Samples from Member 3 of the Shahejie Formation in the Chunliang area of ​​the Boxing subsag, Bohai Bay Basin were selected, with a small amount of core and thin section data and a large amount of well logging data. Lack of intuitive data to judge lithology, it is necessary to identify lithology through well logging interpretation, and the present invention is used to finely identify lithology.

[0065] Take fine identification of lithology of samples from Member 3 of Shahejie Formation in Chunliang area, Boxing subsag, Bohai Bay Basin as an example.

[0066] (1) Select the wells with existing logging, mud logging and lithology data to study and analyze the lithology. It is believed that the lithology in the study area is dominated by mudstone, followed by sandstone and carbonate. According to the main lithology in the study area, two curves among GR, SP, DEN, AC, and RILD were selected in turn to perform cluster analysis in SPSS software, and it was found that the inte...

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Abstract

The invention provides a method and a system for quickly identifying lithology based on a cross plot method. The method comprises the steps of S01, selecting a logging interpretation series; S02, normalizing logging data; S03, finely identifying lithology by using a two-step lithology identification method; S04, determining the lithology boundary and the lithology type by performing statistical analysis on data of different lithology types and comparing the frequencies of different lithology types; and S05, judging and identifying lithology. According to the invention, lithology of a researcharea is analyzed, and a new thought, method and mode are used to quickly determine lithology. On the basis of reserving simple use, data graphical representation and rapid and intuitive lithology identification of the cross plot method, the problem that the cross plot method is difficult to use and cannot reach the standard of fine lithology identification when there is only a small number of rockcores, slices and logging data is solved, and lithology identification is carried out on a large number of logging data by utilizing the model.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration, and in particular relates to a method and system for quickly identifying lithology based on a cross-plot method. Background technique [0002] The identification of lithological characteristics is the basis for understanding strata and reservoir prediction, and the identification of lithology is the first step in reservoir prediction. It is of great significance for predicting high-yield and enriched areas of oil and gas, and is beneficial to oil and gas exploration and development. Core observation is the most direct and effective method to identify lithology, but it cannot be widely used due to high cost and complicated operation process, which promotes the method of interpreting lithology from well logging data. [0003] At present, a variety of methods have been proposed to interpret lithology from well logging data at home and abroad, such as conventional logging series, imag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 夏宇邓虎成滕娟陈文玲王园园解馨慧
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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