Analysis of Influencing Factors on Distribution of Hydrothermal Dolomite of Member 3 of Maokou Formation in Fuling Area

doi:10.3969/j.issn.1006-6535.2021.03.003

Abstract

Abstract: In view of the strong heterogeneity of hydrothermal dolomite distribution, the relationship between basement rift and sedimentary evolution of the Member 3 of Maokou Formation was studied, the relationship between rift mode and dolomite distribution was analyzed, and the sedimentary evolution model was established to predict the distribution of dolomite. According to the study, the Member 3 of Maokou Formation was divided into 5 layers, 1 to 3 layers were the main period of dolomite development, 4 and 5 layers were the platform homogenization period, and no dolomite was not developed;15-1, 15-2 and 16 basement rifts controlled the sedimentary landform of the early "platform-sag" facies, the high geomorphic layer near the rift was favorable for the development of bioclastic beaches, which provided the material basis for the development of dolomite; 15-1 and 15-2 basement rift were flower-shaped, and the surrounding bioclastic beaches were highly dolomitized, which was the most favorable area for the development of dolomite; the 16 basement rift was upright, with low dolomitization in surrounding area, which was relatively favorable for the development of dolomite. The study results can provide a guiding basis for further exploration of hydrothermal dolomite.

Key words: Fuling Area, Member 3 of Maokou Formation, basement rift, sedimentary evolution, hydrothermal dolomite distribution, influencing factors

CLC Number:

TE133

Pan Lei, Tang Dehai, Li Rangbin, Zou Yutao, Zhang Wenrui. Analysis of Influencing Factors on Distribution of Hydrothermal Dolomite of Member 3 of Maokou Formation in Fuling Area[J]. Special Oil & Gas Reservoirs, 2021, 28(3): 15-24.

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