Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (1): 136-144.doi: 10.12108/yxyqc.20240113

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Paleogeomorphology and favorable reservior distribution of the first member of Permian Lucaogou Formation in Jimsar Sag

DENG Yuan1, CHEN Xuan2, QIN Jianhua1, LI Yingyan1, HE Jixiang1, TAO Xin2, YIN Taiju2, GAO Yang3   

  1. 1. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    2. School of Geosciences, Yangtze University, Wuhan 430100, China;
    3. Shenzhen Branch, CNOOC China Limited, Shenzhen 518000, Guangdong, China
  • Received:2022-10-08 Revised:2022-12-09 Online:2024-01-01 Published:2024-01-02

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Abstract: Based on core, logging and seismic data, the paleogeomorphology of the first member of Permian Lucaogou Formation in Jimsar Sag was restored, and the distribution of favorable reservoirs was predicted. The results show that:(1) The reservoirs of the first member of Lucaogou Formation in Jimsar Sag are rich in the sedimentary structures of massive bedding, climbing ripple bedding and plant clasts, and inversely-graded lower part and normallygraded upper part with internal scour surface, which can be interpreted as the origin of lacustrine hyperpycnite. The main microfacies are channel, levee, lobe and margin, among which channel and lobe are favorable reservoirs.(2) During the depositional period of the first member of Lucaogou Formation, the paleogeomorphology of Jimsar Sag showed a pattern of "low in the south and high in the north, and low in the middle and high in the east and west". Three kinds of micro-paleogeomorphology units developed in low position:paleo-groove, paleo-low uplift and paleo-platform. In the paleo-groove, the reserviors present a stacking pattern of aggradation and thick layer filling. The reserviors in palaeo-platform are progradational and lateral stacking pattern with thin layer sheet distribution. The paleo-low uplifts separate the hyperpycnite lobes. The paleo-slope area is lack of hyperpycnite. (3) There are three hyperpycnal channles in southern Jimsar Sag. The channels prograde northward, and the main channles are dispersed into multiple branches, forming multiple overlapping lobes at the end of channles.

Key words: paleogeomorphology, shale oil, hyperpycnites, lobe, channel, Lucaogou Formation, Permian, Jimsar Sag

CLC Number: 

  • TE121.3
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