Logging-information-based complex lithology identification method and system

Abstract

The invention discloses a logging-information-based complex lithology identification method and system. The method comprises the following steps that a plurality of logging characteristic values of template lithology are determined according to core data and logging information, and a minimum value and a maximum value of each logging characteristic value of the template lithology are further determined; normalization is carried out on the minimum value and the maximum value of each logging characteristic value of the template lithology to obtain the normalized minimum values and maximum valuesof the logging characteristic values of the template lithology, and the normalized template lithology logging characteristic value minimum value and maximum value characteristic graphs are drawn in the same plate, and a lithology identification plate is obtained; and a normalized unknown lithology logging characteristic value is projected onto the lithology identification plate, and lithology isidentified. According to the method, the logging information and the core data are used for determining the logging response characteristic value range of the lithology, then the identification plateis drawn, the lithology is identified, logging information is applied, the method is simple and fast and convenient, and the economic benefit of exploration and development is greatly improved.

Description

technical field [0001] The invention relates to the field of oil and gas earth exploration, and more specifically, to a method and system for identifying complex lithology based on well logging data. Background technique [0002] The most effective and direct method to identify lithology is core analysis, but the cost of coring is high, and at the same time, the stratum lithology has great differences in different regions and layers, so it is necessary to establish a lithology identification chart with regional characteristics for the study area. Therefore, Finding out an idea and method of using logging data to identify complex lithology will greatly improve the efficiency of its exploration and development. [0003] At present, there are many methods of lithology identification at home and abroad. Zhao Ni, Liu Aijiang, and Li Rui mentioned that the radar map analysis method is used to divide lithology, but this method does not standardize the logging data and fails to elim...

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Problems solved by technology

[0005] (1) The prior art does not standardize the logging data when dealing with lithology logging eigenvalues, and fails to eliminate the influence of different dimensions and dimensional units between the logging data;

[0006] (2) In the prior art, when drawing the lithology identification chart, only a single logging characteristic value of the lithology is drawn instead of the range of the logging characteristic value of the lithology, which has certain limitations in practical application

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