The Cambrian Sequence and Lithofacies Paleogeography in Bachu Uplift in Tarim Basin

Abstract

Abstract: Based on the sequence interface identification and sedimentary facies analysis, the Cambrian in Buchu uplift in Tarim basin can be divided into 2 second-order sequences (SS1 and SS2) and 14 third-order sequences. Each second-order sequence consists of transgressive system tract (TST) and highstand system tract (HTS). It is indicated that during the development of SS1-TST, a set of deepwater basin-facies deposit develops in this area with crust subsidence, relative sea-level quick raising; during the development of SS1-HST, the regional sedimentary framework transforms from basin to restricted platform and finally enters into open and evaporating environment influenced by lowing sea level, restricted water cycle and dry-hot climate, dominated by gypsodolomite and gypsite. Thus a set of important regional dense cap rocks is formed; as the development of SS2, a large scale of sea-level ascending-descending cycle occurs, as a result a framework of open platform-restricted platform-open platform is shaped.

Key words: Buchu uplift, Cambrian, sequence-lithofacies paleogeography, cap rock

CLC Number:

TE1113
P531

ZHU He, LIU Jia-duo, MENG Wan-bin, YANG Yong-jian. The Cambrian Sequence and Lithofacies Paleogeography in Bachu Uplift in Tarim Basin[J]. Xinjiang Petroleum Geology, 2010, 31(4): 344-348.

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The Cambrian Sequence and Lithofacies Paleogeography in Bachu Uplift in Tarim Basin

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