Development Model of Microbial Reef-shoal in the Lower Cambrian Xiaoerbulak Formation Under Transgression-Regression Transition in the Northern Tarim Basin

doi:10.19657/j.geoscience.1000-8527.2022.093

Abstract

Abstract:

Based on the outcrop observation in Aksu area in the northwestern Tarim Basin, and the analysis of logging data and thin section identification of key exploration wells there, the high-precision sequence stratigraphic framework at north Tarim Basin is established.We analyzed the development model of microbial reef-shoal and carbonate platform evolution in the Xiaoerbulak period, and suggested that the Xiaoerbulak Formation can be subdivided into two third-order sequences (SQ1 and SQ2) and five fourth-order sequences (sq1, sq2, sq3, sq4 and sq5): sq1 and sq2 developed layered microbial mats, which were middle-inner ramp deposition, corresponding to the ramp carbonate platform stage; sq3 is a transition period from ramp carbonate platform to slightly rimmed shelf carbonate platform, and the relative sea-level likely rose first and then fell, and microorganisms began to build reefs in the paleo-geomorphic highlands, and the microbiolites were basically undeveloped in the slope area of low paleo-geomorphic terrain; sq4 and sq5 represent the stage of slightly rimmed shelf carbonate platform with continuous sea-level decline; sq4 developed algal grain shoal and microbial reef deposits, whilst sq5 developed sand shoal, gravel shoal and microbial reef deposits.The high-precision sequence stratigraphic correlation shows that the sea-level change controlled the vertical development of microbial reef shoal, and the paleo-geomorphology controlled the planar microbial reef shoal distribution.

Key words: high-precision sequence division, stratigraphic framework, microbial reef-shoal, sedimentary facies, development model

CLC Number:

P618.13

CHEN Gege, GAO Zhiqian, JIAO Cunli, HU Zongquan, YUAN Yuxuan, WEI Duan, ZHAI Xinqing, CHANG Zhe. Development Model of Microbial Reef-shoal in the Lower Cambrian Xiaoerbulak Formation Under Transgression-Regression Transition in the Northern Tarim Basin[J]. Geoscience, 2023, 37(05): 1169-1181.

Figures/Tables 9

Fig.1 Geological sketch map of the study area

Fig.2 Outcrop photos of sequence contact identification of the Xiaoerblak Formation in Jinlinkuang section, NW Tarim Basin

Fig.3 Seismic response characteristics of sequence boundary from well Tashen 5 to well Tashen 1

Fig.4 Comprehensives tratigraphic column of Xiaoerblak Formation in well Tashen 5

Fig.5 High-resolution stratigraphic division scheme of the Xiaoerbulak Formation in northern Tarim Basin

Fig.6 Photos showing the characteristics of the fourth-order sequence interface the Xiaoerblak Formation in Jinlinkuang section, NW Tarim Basin

Fig.7 Cross-section of the Xiaoerbulak Formation (from east to west) in north Tarim Basin

Fig.8 Microbial reef-shoal evolution diagram of Xiaoerbulak Formation in north Tarim Basin

Fig.9 Sedimentary facies development models of Xiaoerbulak Formation in north Tarim Basin

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