Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (5): 45-58.doi: 10.12108/yxyqc.20210505

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Sequence stratigraphy division and evolutionary features of Permian Lucaogou Formation in Jimsar Sag

ZHANG Wenwen, HAN Changcheng, TIAN Jijun, ZHANG Zhiheng, ZHANG Nan, LI Zhengqiang   

  1. Geology and Mining Engineering academy, Xinjiang University, Urumqi 830046, China
  • Received:2020-08-10 Revised:2021-01-18 Online:2021-10-01 Published:2021-09-30

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Abstract: To clarify the sequence stratigraphic characteristics and evolution of the Permian Lucaogou Formation in Jimsar Sag, many drillings core analysis, well logging analysis and seismic data interpretation were carried out. The distribution characteristics of the sedimentary microfacies of the Lucaogou Formation were comprehensively studied. The results show that:(1) The Lucaogou Formation of the Jimsar Sag, from bottom to top, can be divided into two third-order sequences(SQ1 and SQ2), and SQ1 can be divided into lowstand(LST), transgressive (TST) and highstand system tracts(HST), SQ2 can be divided into TST, HST. "sweet spots" is formed in HST. (2) The Lucaogou Formation is a set of delta-salined lake sedimentary system, which can be identified 8 sedimentary microfacies(sand dam, pre-delta mud, beach sand, shallow lake mud, mixed flat, dolomitic flat, semideep lake mud and turbidite deposit).(3) During the depositional period of the Lucaogou Formation in Jimsar Sag, mixed deposition of terrigenous clastics and carbonate rocks continued to exist. The terrigenous clastic delta sedimentary system was more developed in the early stage, and the saline lake sedimentary system was more developed in the late stage.(4) Climate, intensity of material supply and periodic rise and fall of the lake level control the stratigraphic development and sedimentary evolution of Lucaogou Formation in Jimsar Sag. The research results have guiding significance for the petroleum exploration of Permian Lucaogou Formation in Jimsar Sag.

Key words: sequence stratigraphy, sedimentary evolution, sedimentary microfacies, saline lake, Lucaogou Formation, Permian, Jimsar Sag

CLC Number: 

  • TE121.3
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