Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (2): 49-59.doi: 10.12108/yxyqc.20250205

• PETROLEUM EXPLORATION • Previous Articles    

Paleogeomorphological characteristics and reservoir control of the sedimentary period of Silurian Longmaxi Formation in Luzhou-Yuxi area

LIU Yong1, LIU Yongyang2,3, ZHAO Shengxian2,3, YIN Meixuan2,3, LI Bo2,3, CHEN Lei4, WU Shuaicai4, XIE Shengyang2,3   

  1. 1. Gas Field Development Management Department, PetroChina Southwest Oil & Gasfield Company, Chengdu 610051, China;
    2. Shale Gas Research Institute of PetroChina Southwest Oil & Gasfield Company, Chengdu 610051, China;
    3. Sichuan Key Laboratory of Shale Gas Evaluation and Exploitation, Chengdu 610213, China;
    4. School of Southwest Petroleum University, Chengdu 610500, China
  • Received:2024-08-21 Revised:2024-09-16 Published:2025-03-06

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Abstract: The Silurian Longmaxi Formation shales in Luzhou-Yuxi area is one of the key blocks for unconventional oil and gas resource exploration in China. Based on whole rock X-ray diffraction analysis，rock mineral identification，seismic data interpretation and drilling data research，the sedimentary paleogeomorphology of the study area was reconstructed using the impression method，and its influence on the distribution of high-quality shale reservoirs was analyzed. The results show that：（1）During the deposition of Silurian Longmaxi Formation shale，the Luzhou-Yuxi area exhibited a paleogeomorphological pattern characterized by“one uplift，one depression，and two gentle slopes”.The sedimentary area can be subdivided into underwater uplift zones，underwater slope belts and underwater depression areas.（2）The mineral composition of shale is mainly composed of siliceous minerals，followed by clay minerals，carbonate minerals and pyrite. Ten types of shale lithofacies can be identified，mainly consisting of siliceous shale facies association（S）and mixed shale facies association（M）. With the siliceous shale facies association（S）being more prevalent and continuous in the underwater uplift zones，make it the high-quality lithofacies in the area.（3）Significant differences in the development of shale lithofacies and reservoir parameters（TOC，porosity and gas content）were observed across different geomorphic units. In the underwater uplift zones，the TOC value of the shale ranges from 3.03% to 5.06%，with an average of 4.25%；the porosity ranges from 4.81% to 6.30%，with an average of 5.46%；and gas content ranges from 1.70% to 7.62%，with an average of 5.05%. The shale reservoir quality in this zone is significantly superior to that of underwater slope belts and underwater depression areas. Horizontally，high-quality shales，characterized by high TOC，high porosity and high gas content，are distributed in a banded pattern across the underwater uplift zone and its periphery.

Key words: impression method, siliceous shale lithofacies, reservoir quality, underwater uplift zones, underwater slope belts, underwater depression areas, sedimentary paleogeomorphology, Longmaxi Formation, Silurian, Luzhou-Yuxi area

CLC Number: 

  • TE121
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