Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (4): 59-68.doi: 10.12108/yxyqc.20200406

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Sedimentary characteristics of fan delta during initial rifting stage in Sujiatun sub-depression,Songliao Basin

YANG Wenjie1,2, HU Mingyi1,2, SUYA Latu3, LIU Chang4, YUAN Yi1,2, LI Jinchi1,2   

  1. 1. School of Earth Sciences, Yangtze University, Wuhan 430100, China;
    2. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan 430100, China;
    3. Erlian Branch, PetroChina Huabei Oilfield Company, Renqiu 062550, Hebei, China;
    4. School of Earth Sciences, Lanzhou University, Lanzhou 730000, China
  • Received:2019-09-19 Revised:2019-11-25 Online:2020-08-01 Published:2020-06-16

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Abstract: As a kind of good oil and gas reservoir,sandy conglomerate bodies of fan delta have been paid more attention. In order to deepen the understanding of the sedimentary characteristics of the fan delta during the initial rifting stage in the fault basin,taking Huoshiling Formation in Sujiatun sub-depression of Songliao Basin as an example,the development rules,sedimentary characteristics and controlling factors of fan delta in the initial rifting stage were studied by using core,well logging,three-dimensional seismic data and paleogeomorphic restoring technology. The fan delta sedimentary model in the initial rifting stage of the faulted lacustrine basin was established. The results show that:(1)During the initial rifting stage of Sujiatun sub-depression,there was a grabentype faulted lake basin with EW double faults developed,the terrain height difference was large within the area, the tectonic movement was active,and the sediment source were mainly from the northwest,southwest and east of the sub-depression.(2)During the formation stage of Huoshiling Formation,fan delta sedimentary system was widely developed. The lithology was dominated by thick bedded variegated and gray sandy conglomerate with thin bedded gray mudstone. The logging curves were mostly box or bell shaped with high amplitude. The fan delta deposits are characterized by oblique progradation reflection,wedge-shaped or mound shaped disordered reflection structure on the seismic section.(3)The distribution of the sedimentary system was mainly controlled by basin faults and paleogeomorphology,forming the sedimentary pattern of "lacustrine facies across the central sag,fan delta facies in the east-west fault terrace" and the source reservoir assemblage of "hydrocarbon generation in the center and reservoirs on both sides".(4)The structural activity in the initial rifting stage is the main controlling factor for the development of fan delta system. The basin-controlling fault not only controls the distribution of sedimentary facies belt and reservoir sand bodies,but also continuously affects the sedimentary filling evolution trend of faulted lacustrine basins. The research results could provide a geological basis for oil and gas exploration in deep strata of fault depression of continental basin.

Key words: fan delta, initial rifting stage, sedimentary characteristics, Huoshiling Formation, Songliao Basin

CLC Number: 

  • TE121.3
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