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Geoscience ›› 2019, Vol. 33 ›› Issue (06): 1151-1162.DOI: 10.19657/j.geoscience.1000-8527.2019.06.02

• Petroleum Geology • Previous Articles     Next Articles

Tectonic Sedimentology Characteristics of Continental Rift Basin: Case Study from Fulongquan Fault Depression of Songliao Basin

WANG Hongyu1(), LI Ruilei2, ZHU Jianfeng2, XU Wen2   

  1. 1. School of Energy Resources,China University of Geosciences, Beijing 100083,China
    2. SINOPEC Northeast Oil and Gas Company, Changchun,Jilin 130062,China
  • Received:2018-12-05 Revised:2019-03-10 Online:2019-12-26 Published:2019-12-27

Abstract:

Tectonic sedimentology not only concerns with the controlling effects of tectonic background conditions on the basin’s formation and evolution, but also the feedback relationship between tectonism and sedimentation in the basins. Evolution of continental rift basin is often accompanied by frequent tectonic activities and complex sedimentation processes. Tectonic sedimentology can reveal the characteristics of complex tectonic-sedimentary evolution of continental rift basins. Based on seismic, logging and regional geotectonic data, this work studied the structural and sedimentary evolution of the Fulongquan fault depression in the Songliao Basin. We also analyzed the feedback relationship between tectonism and sedimentation. Consequently, the sedimentary evolution regularities in the half-graben lacustrine basin and its controlling factors were discussed. The study shows that during the evolution of Fulongquan fault depression, volcanism had likely significant effects on the basin shape in the initial rifting phase. Distribution features and growth rate of the boundary faults played a primary role in the evolution of the basin configuration. With the stable paleoclimate environment during the rifting period, tectonics is the primary controlling factor of the stratigraphic sequence and sedimentary characteristics of the lacustrine rift basin development. The fault development features determined the ancient basin landform, which further affected the types and distribution patterns of basin sedimentary system. The regional tectonic uplift and fault block tilting are the main factors of the unconformity development in the half-graben basin.

Key words: tectonic sedimentology, continental rift basin, syn-sedimentary fault, sedimentary system, Songliao Basin, Fulongquan fault depression

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