Sedimentary Characteristics of the Maokou Formation of the Permian in Northern Sichuan Basin and Its Petroleum Significance

doi:10.11885/j.issn.1674-5086.2020.12.24.04

Abstract

Abstract: Based on the fine seismic data interpretation result, combining the field sections and indoor thin-section observation, we study the depositional facies distribution characteristics, by analyzing the main rock types, paleontology, geochemical and seismic characteristics. On the basis of biological (chip) limestone, siliceous rocks and reef limestone development rule of the lithofacies and seismic stratigraphic structures and stratigraphic thickness variation characteristics, we find out that Maokou Formation has developed sedimentary facies of the open sea platform, marginal-platform shoals and slope-basin, summarize four kinds of sedimentary facies association, open sea platform with patch reefs, open sea platform with shaoal patch, the marginal-platform shoals and calcareous-siliceous basins. Land clarify the vertical evolution of sedimentary facies and plane distribution rule. The results show that the high-energy marginal-platform shoals present banding development in the Jiange——Yuanba——Longgang Area. The biological (chip) limestone develops the intercrystalline denudation pore, intergranular dissolved pore and biogenic body cavity pore, which is a high quality reservoir development zone with good physical properties. Maokou Formation (Member 4) in the western Sichuan trough and Guangyuan——Wangcang trough area sedimentary siliceous rock and mudstone is the high quality source rocks, the excellent sedimentary environment providing a favorable conditions for hydrocarbon accumulation oil source and reservoir.

Key words: rock types, sedimentary characteristics, the marginal-platform shoals, Maokou Formation, northern Sichuan Basin

CLC Number:

TE122

ZENG Deming, XIE Xiaobin, HUANG Dong, YU Liangzhi, ZHANG Yu. Sedimentary Characteristics of the Maokou Formation of the Permian in Northern Sichuan Basin and Its Petroleum Significance[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(1): 1-12.

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