Rapid lithology identification method for calculating relative percentage content of quartz

Abstract

The invention discloses a rapid lithology identification method for calculating relative percentage content of quartz. The rapid lithology identification method comprises the following steps of 1) acquiring the chipping component information of quartz, feldspar and rock debris; 2) determining the sandstone type of the reservoir in the research area; 3) establishing a division standard for determining the sandstone types based on the relative percentage content of quartz; 4) selecting the compensation density, the photoelectric absorption cross section index and the deep resistivity as the sensitive logging curves reflecting the reservoir lithology; 5) establishing a nonlinear mapping relation model between the logging curve of the compensation density, the photoelectric absorption cross section index and the deep resistivity and the quartz relative percentage content; and 6) determining the relative percentage content of quartz in the prediction well, and performing the lithology identification according to the division standard of determining the sandstone type based on the relative percentage content of quartz, so that the rapid identification of the quartz property can be accurately realized based on the relative percentage content of quartz.

Description

technical field [0001] The invention belongs to the technical field of reservoir evaluation, and relates to a rapid lithology identification method for calculating the relative percentage of quartz. Background technique [0002] Reservoir lithology identification is one of the important tasks of reservoir logging evaluation, and it is the basis for solving reservoir parameters and judging fluid properties. At present, there are many methods to identify lithology with logging data, such as crossplot method, fisher discriminant method, Bayesian cluster analysis method, etc., but these methods are only used to analyze lithology from the perspective of grain size in clastic rock reservoirs. Identification, and lithology identification is not carried out from the perspective of rock component content. It is generally believed that the lithology of clastic rock reservoirs is relatively simple. However, combined with the thin-section identification and analysis data and logging re...

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Problems solved by technology

It is generally believed that the lithology of clastic rock reservoirs is relatively simple. However, combined with the thin-section identification and analysis data and logging response characteristics of the target reservoir in the study area, the target reservoir is mainly composed of quartz sandstone and lithic quartz sandstone, with a small amount of rock. Debris sandstone, different sandstone types cause background differences in logging responses, making logging interpretation and evaluation difficult

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