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Facies model of a mixed siliciclastic-carbonate ramp of the Ma’antang Formation (Carnian period), Sichuan Basin, China

  • Zhensheng ShiEmail author
  • Changmin Guo
Original Paper
  • 37 Downloads

Abstract

The Ma’antang Formation of Late Triassic is of great importance in petroleum exploration in Sichuan Basin, China, but its sedimentary facies and thickness distribution need further specific investigation. In this paper, the concerning types, distribution, facies model, and controls of sedimentary facies of the Ma’antang Formation are thoroughly discussed, based on an analysis of 130 wells and 12 outcrops in the whole basin. As a result, it is proposed that the Ma’antang Formation is of siliciclastic-carbonate ramp facies model, including seven types of sedimentary facies: open sea shelf, organic reef, bioclastic bank, oolitic shoal, interbank sea, tidal flat, and delta. The organic reef, bioclastic bank, and oolitic shoal are distributed along the Longmen Mountain belt in the southwest part of the basin; the tidal flat, consisting of gray and black mudstone interbedded with thin siltstone and coal bed, is mainly located in the middle of the basin; the delta is distributed chiefly in the northwest of the basin. Three controls are contributed to the formation of the siliciclastic-carbonate ramp, including the flattish palaeotopography, the abundant supply of terrigenous clast and lower rate fluctuation of base level during Carnian period. Four types of reservoirs (organic reef, bioclastic bank, and oolitic shoal reservoir and deltaic reservoir) are developed in the Ma’antang Formation and two types of source rocks (the Ma’antang Formation shale and Xiao’tangzi Formation shale) can supply abundant hydrocarbon to it. The reservoirs and source rocks form efficient assemblages of source rock and reservoir vertically.

Keywords

Facies model Mixed siliciclastic-carbonate ramp The Ma’antang Formation Sichuan Basin 

Notes

Acknowledgments

We sincerely thank Hualing Ma, an engineer in the Petrochina Northwest Sichuan Gas Mine of Southwest Oilfield, for his guidance and selfless help during the field geologic survey. We also acknowledge the efforts of Zhengwang Zhao, Changjiang Wu, and Hui Jin for their help in sampling and testing, and the efforts of Zengzao Feng and Xiujuan Zheng for their help in identifying fossil organisms. Jiayu Gu, Chuanxin Li, and Zeqing Guo are thanked for useful discussion and comments.

Funding information

This research is financially supported by the National Natural Science Foundation of China (No: 41572079) and the Petrochina Exploration and Exploitation Company and PetroChina Southwest Oil and Gas Field Company.

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Copyright information

© Saudi Society for Geosciences 2019

Authors and Affiliations

  1. 1.Unconventional Oil and Gas DepartmentResearch Institute of Petroleum Exploration and DevelopmentLangfangChina

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