Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (2): 9-16.doi: 10.12108/yxyqc.20210202

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Sedimentary characteristics and reservoir accumulation model of salt lake of Paleogene Qianjiang Formation in Jianghan Basin

HUANG Hua1, YUAN Juanmei2, PENG Wei2, ZHANG Liang2, WEN Hui2   

  1. 1. Chongqing Fuling Shale Gas Exploration and Development Company, Sinopec, Chongqing 408000, China;
    2. Research Institute of Exploration and Development, Sinopec Jianghan Oilfield Company, Wuhan 430223, China
  • Received:2020-05-18 Revised:2020-08-06 Online:2021-04-01 Published:2021-03-31

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Abstract: Jianghan Basin is a typical continental salt lake basin. The main oil and gas producing layer is the salt interlayer of Paleogene Qianjiang Formation. In order to study the sedimentary characteristics and reservoir forming model of salt lake,the paleogeomorphology,paleostructure and paleoclimate of Qianjiang Formation Late Eocene were reconstructed,and SEM analysis and sand body distribution characteristics were carried out. The results show that:(1) The formation of the salt lake basin is based on the "high mountain and deep basin" paleogeomorphology and deep concave paleostructure controlled by faults. The climate is mainly subtropical drought,supplemented by alternation of dry and wet,forming multi rhythm deposits.(2) The lithology of Qianjiang Formation in Qianjiang sag includes clastic rock,carbonate rock,evaporite and their mixed types,in which salt minerals come from weathered minerals and deep hydrothermal materials carried by the water system in the source area. Both conventional sandstone and unconventional migmatite in the study area have oil and gas production. The conventional sandstone reservoir has the characteristics of "source controlled enrichment,strata bound migration and sand control scale",while the unconventional migmatite reservoir has the characteristics of "sedimentary controlled block and source rock controlled horizon". The research results can provide reference for oil and gas exploration in salt lake Basin.

Key words: salt lake deposit, paleogeomorphology, paleoenvironment, paleoclimate, Qianjiang Formation, Paleogene, Jianghan Basin

CLC Number: 

  • TE122.1
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