Lithology Identification for Diamictite Based on Lithology Scan Logging: A Case Study on Fengcheng Formation, Mahu Sag

doi:10.7657/XJPG20220612

Abstract

Abstract:

Hydrocarbon-rich continental diamictite developed in the Permian Fengcheng formation of Mahu sag, Junggar basin is characterized by varieties of minerals and rapid variation of lithology. Conventional logging cannot be used to effectively identify the lithology of diamictite. By using lithology scan logging, the mass fractions of the main elements in the formation are obtained, and the mineral mass fraction is then calculated according to the relationship between mineral-sensitive elements and minerals. The diamictite index is constructed by using the ratio of felsic mineral content to carbonate mineral content, and the shale index is constructed by using the difference between neutron porosity and nuclear magnetic resonance total porosity. Then the lithology identification chart for the diamictite in the Fengcheng formation is formed by intersecting the diamictite index and the shale index. The results show that the calculation of mineral content is accurate with the average relative error of only 6.5%, and the lithology interpretation exhibits a coincidence rate of 90.9%, which meets the needs of logging evaluation. The proposed method provides a reference for logging lithology identification of diamictite shale reservoirs.

Key words: Mahu sag, Fengcheng formation, lithology scan logging, lithology identification, diamictite, cross plot chart, mineral

CLC Number:

P631

MAO Rui, SHEN Ziming, ZHANG Hao, CHEN Shanhe, FAN Haitao. Lithology Identification for Diamictite Based on Lithology Scan Logging: A Case Study on Fengcheng Formation, Mahu Sag[J]. Xinjiang Petroleum Geology, 2022, 43(6): 743-749.

Figures/Tables 8

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