Oil & Gas Geology ›› 2022, Vol. 43 ›› Issue (3): 670-681.doi: 10.11743/ogg20220315

• Petroleum Geology • Previous Articles     Next Articles

Sequence stratigraphy and sedimentary filling characteristics of a half-graben rift lake basin during the initial rifting period: A case study of the 2nd member of Lower Cretaceous Huoshiling Formation, Linan Sag, Songliao Basin

Zhongcheng Li1,2,3(), Zhidong Bao1,2(), Zhaodheng Wei3, Guoyi Zhang3, Yanqqing Shi1,2, Mingyi Hu4, Qingjie Deng4   

  1. 1.College of Geosciences,China University of Petroleum (Beijing),Beijing 102249,China
    2.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum (Beijing),Beijing 102249,China
    3.Research Institute of Exploration and Development,Jilin Oilfield Company,PetroChina,Songyuan,Jilin 138000,China
    4.School of Geosciences,Yangtze University,Wuhan,Hubei 430100,China
  • Received:2021-06-21 Revised:2022-03-12 Online:2022-05-06 Published:2022-05-06
  • Contact: Zhidong Bao E-mail:lizc?jl@petrochina.com.cn;baozd@cup.edu.cn

Abstract:

Due to the Jurassic-Cretaceous regional tectonic extension, a series of half-graben rift lake basins were formed in the Songliao Basin. The latest exploration and development shows good source-reservoir-cap rock combinations and hydrocarbon potential in these basins. The second member of Huoshiling Formation in Linan trough of southern Songliao Basin is chosen as the research object to reveal the sequence stratigraphy, sedimentary system and basin filling evolution characteristics in these basins based on the integration of core, logging and 3D seismic data. The member can be divided into three medium-term base level cycles of fan delta and lake facies. The scales of fan deltas in steep slope zone are different from that in gentle slope zone during the early rifting stage of the half graben rift basins. With the expansion of the basin, the sedimentary facies belts in different structural belts take on obvious differentiation characteristics. The steep slope belt is often dominated by long and narrow coarse-grained isolated thick fan delta deposits, while the gentle slope belt is dominated by large superimposed fine-grained thin fan delta deposits. Based on these understanding, this study discusses the main controlling factors of sedimentary difference between steep slope zone and gentle slope zone of the member and brings forward the sedimentary model for the early stage of half-graben rift lake basins.

Key words: sedimentary filling, sequence stratigraphy, Huoshiling Formation, half-graben rift lake basin, Linan Sag, Songliao Basin

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