A method for indicating the degree of pyrite development in carbonate reservoirs

By using resistivity and acoustic time-of-flight intersection methods, sensitive parameters are selected, trend lines are established, and pyrite-enriched layers are identified. This solves the problems of complex and costly identification in existing technologies, and achieves rapid and accurate indication of pyrite development, thereby improving the accuracy of exploration and fluid identification.

CN122085404APending Publication Date: 2026-05-26PETROCHINA CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PETROCHINA CO LTD
Filing Date
2024-11-26
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies are insufficient for quickly and accurately identifying the degree of pyrite development in carbonate reservoirs, and existing methods are complex and costly, failing to meet the needs of exploration and fluid identification.

Method used

By combining resistivity and acoustic time-of-flight intersection methods, sensitive parameters are selected, trend lines are established, pyrite enrichment zones are identified, and the degree of pyrite development is evaluated by the degree of intersection difference, thus achieving a rapid and accurate indication of the degree of pyrite development.

Benefits of technology

It can quickly and accurately identify the degree of pyrite development in carbonate reservoirs, improve the efficiency of exploration and research and the accuracy of fluid identification, and is applicable to various well sections, especially those without elemental logging data.

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Abstract

This invention discloses a method for indicating the degree of pyrite development in carbonate reservoirs, belonging to the field of geological exploration technology. Its key features include the following steps: a) selecting sensitive parameters to distinguish pyrite development based on the well logging response characteristics of pyrite-developed strata; b) establishing trend lines for the variation of sensitive parameters in formations with no or low pyrite content using these sensitive parameters; c) constructing trend lines for the variation of sensitive parameters with pyrite content based on strata data from key wells with different pyrite contents; d) identifying pyrite-enriched strata in the wells to be identified based on the intersection indications of the sensitive parameters; e) evaluating the degree of pyrite development in the pyrite-enriched strata by assessing the degree of difference in the intersection of sensitive parameters. This invention achieves the identification of pyrite-enriched strata through resistivity and sonic transit time intersection, enabling rapid and accurate identification of the degree of pyrite development in carbonate reservoirs.
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