Paleo-Geomorphology and Its Controls on Sedimentation of the Permian Wutonggou

doi:10.7657/XJPG20200602

Abstract

Abstract:

For a long time, researchers have divergent views on the sedimentary system of the Permian Wutonggou formation in the Taibei sag, Tuha basin, and the key issue lies in the failure to accurately determine the paleo-geomorphology. In this paper, based on the moldic method and high-resolution sequence stratigraphy, the conversion interfaces of the base level cycle are determined, and the residual stratum thickness and paleo-water depth correction under the interfaces is used to recover the paleo-geomorphology of the Permian Wutonggou formation in the Taibei sag. The study results show that the dark gray mudstones developed at the first member of the Wutonggou formation can serve as the maximum lake flooding surface and the upper marker layer for recovering paleo-geomorphology; the Permian paleo-geomorphology was characterized by “low convex interbedded with groove” during the deposit period of the first member of the Wutonggou formation, which can be further divided into two major grooves and several secondary grooves, while paleo-geomorphology became more gentle after the sediment filling of the second and third members of the Wutonggou formation. Inherited paleo-uplifts and the syn-depositional faults controlled the development of fan deposits. The grooves in the paleo-uplifts are the main factors controlling the direction of paleocurrent and sand body distribution. Huoshen and Qishen syn-depositional faults in the south of the Taibei sag intensify the slope break level between uplift and sag, and the tectonic ridges limit the forward distance of the fan bodies. The “low convex interbedded with groove” control the distribution of the fan bodies. Sand bodies mainly advanced along the paleo-grooves and filled the grooves. During the deposition of the Wutonggou formation, the paleo-geomorphology transformed from the early steep-slope and deep-water fault depression to the late gentle-slope and shallow-water depression.

Key words: Taibei sag, Wutonggou formation, paleo-geomorphology, sedimentation, residual stratum thickness, conversion interface, paleobathymetric correction

CLC Number:

TE111.3

CHEN Xuan, WU Chao, WANG Bo, YANG Shaochun, WANG Ya, WANG Yongchao. Paleo-Geomorphology and Its Controls on Sedimentation of the Permian Wutonggou[J]. Xinjiang Petroleum Geology, 2020, 41(6): 642-650.

Figures/Tables 8

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