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Volume 37 Issue 4
Aug.  2018
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Article Navigation >  CARSOLOGICA SINICA  > 2018  >  37(4): 592-601
WANG Wenkai, XU Guoming, DAN Yong, SONG Xiaobo, WANG Qiongxian, FENG Xia, ZHANG Lu. Unconformity characteristics of the top of Leikoupo Formation and their effect on reservoirs in the western Sichuan basin[J]. CARSOLOGICA SINICA, 2018, 37(4): 592-601. doi: 10.11932/karst20180413
Citation: WANG Wenkai, XU Guoming, DAN Yong, SONG Xiaobo, WANG Qiongxian, FENG Xia, ZHANG Lu. Unconformity characteristics of the top of Leikoupo Formation and their effect on reservoirs in the western Sichuan basin[J]. CARSOLOGICA SINICA, 2018, 37(4): 592-601. doi: 10.11932/karst20180413
shu

Unconformity characteristics of the top of Leikoupo Formation and their effect on reservoirs in the western Sichuan basin

doi: 10.11932/karst20180413
  • 1.

    Research Institute of Petroleum Exploration and Production, Southwest Petroleum Branch, SINOPEC/Post-doctoral Research Station, Southwest Petroleum Branch, SINOPEC

  • 2.

    Post-doctoral Research Station, Southwest Petroleum Branch, SINOPEC

  • 3.

    Institute of Karst Geology, CAGS, Guilin, Guangxi

  • 4.

    Oil&Gas Sales Corporation, Southwest Petroleum Branch, SINOPEC

  • Publish Date: 2018-08-25
    Abstract
  • Recently, a great breakthrough in gas exploration has been made at the top of Leikoupo Formation, where high-quality reservoirs were found by drilling in the western Sichuan basin. Based on outcrop, core, thin section, log, element analysis, carbon and oxygen isotopes, this work defined the unconformity characteristics and analyzed their influence on the reservoirs. The results show varied effects of the unconformity at different places. The Pengzhou area hosts fractured limestone reservoirs, where the conformity has no effect on them. In the Xinchang area, paleokarst may have improved the reservoir quality. Conformity has controlled reservoir distribution in the Huilong area, because in the subaerial environment gypsum dissolution and pores are preserved. Lithofacies and micro-palaeogromorphology are main factors of karstification affecting the development of paleokarst in western Sichuan basin . Large-scale paleokarst reservoirs developed widely in the Huilong area, which would be the favorable target for next exploration.

     

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