Types and Distribution of Grain Shoals in Yijianfang Formation of Fuman Area, Tarim Basin

doi:10.7657/XJPG20240407

Abstract

Abstract:

To clarify the types and distribution of grain shoals in the Middle Ordovician Yijianfang formation in the Fuman area of the Tarim basin, the sedimentary facies and distribution were studied using the core, rock thin section, carbon isotope, logging, and seismic data. The sedimentary facies of the Yijianfang formation in the study area can be categorized into slope-basin, platform margin, and open platform, with the latter two being the principal zones for grain shoal development. The grain shoals which include psammitic shoal, oolitic shoal, bioclastic shoal, and transitional types, generally account for over 80% of the formation thickness, or even over 90% in some well blocks. The distribution of these shallow grain shoals are primarily under the control of sedimentation processes represented by lateral migration in the setting of rapid marine transgression and gradual marine regression. The psammitic shoals and bioclastic-psammitic shoals extensively distributed in the open platform indicates excellent reservoir quality, and they will be significant targets for future petroleum exploration.

Key words: Tarim basin, Fuman area, Ordovician, Yijianfang formation, carbonate, grain shoal type, grain shoal distribution

CLC Number:

TE122.1

ZHU Yongfeng, ZHANG Yanqiu, YANG Xinying, YANG Guang, PENG Debing, HAN Yu, WANG Zhenyu. Types and Distribution of Grain Shoals in Yijianfang Formation of Fuman Area, Tarim Basin[J]. Xinjiang Petroleum Geology, 2024, 45(4): 432-441.

Figures/Tables 9

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