Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (5): 63-72.doi: 10.12108/yxyqc.20220505

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Sedimentary characteristics of fan delta in restricted lacustrine basin of Permian Xiazijie Formation in Mahu Sag

YANG Fan1, BIAN Baoli2, LIU Huiying3, YAO Zongquan3, YOU Xincai2, LIU Hailei2, WEI Yanzhao1   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    2. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    3. School of Geological and Mining Engineering, Xinjiang University, Urumqi 830047, China
  • Received:2021-12-06 Revised:2022-03-23 Online:2022-09-01 Published:2022-09-06

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Abstract: Based on core observation,well logging and seismic interpretation,the sedimentary settings and sedimentary system of Permian Xiazijie Formation in Mahu Sag were systematically analyzed by using paleogeomorphology,lithofacies characteristics,single well facies and well-tie sedimentary facies contrast. The results show that:(1)Controlled by the accommodation space,the lithologies of Xiazijie Formation in Mahu Sag are mostly sandy conglomerate,and fan delta deposits are developed. The paleogeomorphology formed by tectonic movement controls the sedimentary space. The tectonic pattern shows "fault in the north,denudation in the west,and overlap in the southeast".(2)There are four major provenance systems in Xiazijie Formation in Mahu Sag. The northern region is a long axis far-source area with low sand-stratum ratio and thin reservoirs. The western,southern and eastern regions are mainly short-axis near-source areas with rapid deposition,large vertical thickness and narrow plane distribution of facies zone. However,a long-axis far-source is developed in the southern region.(3)The Xiazijie Formation in Mahu Sag is mainly composed of coarse and medium conglomerates with poor sorting,medium roundness and high content of matrix. The reservoirs are mainly distributed near the slope break zone and developed in braided channels and underwater distributary channels.(4)During the sedimentary period of Xiazijie Formation,the accommodation space is large at the mountain side of Mahu Sag where huge thick fan delta sand gravel body developed and extended limitedly. The narrow and long valley landform in Manan area provides a channel for sediment transportation to the middle of Mahu Sag. This long axis far-source sedimentary system can form large-scale effective reservoirs,the sand-stratum ratio is greater than 50%,and the sediment sorting and roundness are relatively good,which is a favorable reservoir development zone.

Key words: sandy conglomerate reservoir, paleogeomorphic features, provenance, accommodation space, fan delta in restricted lacustrine basin, Xiazijie Formation, Permian, Mahu Sag

CLC Number: 

  • TE121.3+1
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