Oil & Gas Geology ›› 2022, Vol. 43 ›› Issue (5): 1039-1048.doi: 10.11743/ogg20220503

• Petroleum Geology • Previous Articles     Next Articles

Review on provenance, transport-sedimentation dynamics and multi-source hydrocarbon sweet spots of continental fine-grained sedimentary rocks

Zaixing Jiang1(), Yunzeng Wang2, Li Wang1, Xiangxin Kong1, Yepeng Yang1, Jianguo Zhang1, Xinyu Xue1   

  1. 1.School of Energy Resources,China University of Geosciences (Beijing),Beijing 100083,China
    2.Daqing Tamsag,LLC,PetroChina,Daqing,Heilongjiang 163453,China
  • Received:2022-03-19 Revised:2022-07-22 Online:2022-10-01 Published:2022-09-02

Abstract:

With the rapid development of unconventional oil/gas industry, more and more attention has been paid to fine-grained sedimentary rocks. The study expounds the rock types, provenances, transport-sedimentation dynamics and hydrocarbon sweet spots of fine-grained sedimentary rocks of continental lacustrine facies in a systematic manner, based on the researches of fine-grained sedimentary rocks in recent years both at home and abroad. The accumulation of fine-grained sedimentary rocks in the continental lacustrine basin is mainly a result of multi-source supply of terrestrial, intrabasinal authigenic, volcanic and mixed-source sediments. The deposition mechanisms of fine-grained sediments include suspended sedimentation, gravity flow, volcanic, hydrothermal and intrabasinal biochemical activities, and the sediments may have undergone autochthonous re-deposition or re-deposition after short-distance transport before becoming consolidated rock. The provenance of fine-grained sediments plays a major role in determining the sedimentary characteristics, physical qualities, and hydrocarbon enrichment mechanism of the fine-grained sedimentary rocks. The study of provenance and transport-deposition dynamics of fine-grained sedimentary rocks is of great guiding value to shale oil/gas exploration and development.

Key words: provenance, transport-deposition model, type of sweet spots, fine-grained sedimentary rock, shale oil/gas

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