Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (3): 93-103.doi: 10.12108/yxyqc.20200309

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Sequence architecture and structural response of the third member of Shahejie Formation in Liuzan area，Nanpu Sag

REN Mengyi1, JIANG Qingchun1, LIU Zhen2, LU Chaojin2   

  1. 1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
    2. College of Geosciences, China University of Petroleum(Beijing), Beijing 102299, China
  • Received:2019-09-25 Revised:2019-11-27 Online:2020-05-21 Published:2020-04-30

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Abstract: With the source to sink system of Nanpu Sag-Matouying uplift,sediments sink to the Liuzan area in Nanpu Sag developed multi-period sequence,whereas the architecture and sedimentary filling characteristic exist a significant difference. On the basis of seismic,drilling,logging and core data,according to Integrated Prediction Error Filter Analysis(INPEFA) and attribute extraction,evolution of sequence architecture was stated. The controls of tectonics on sequence architecture of terrestrial rift basin were emphatically discussed. The results show that:(1) Five 3rd-order sequences were identified in the third member of Shahejie Formation(Es3). And five types of sequence unit were established,namely "ascending", "ascending-dominated", "near-symmetrical", "descending-dominated" and "descending" in 4th-order sequences.(2) Progressing or retrograding fan delta and coastal subsea apron were developed. From sag margin to center(or from TST to RST),the sequence architecture was evolved from "(ascending) ascending-dominated" pattern to "near-symmetrical" pattern and to "(descending) descending-dominated" pattern.(3) Sequence architecture is controlled by episodic tectonic subsidence. The subsidence rate in Es3-Es2 was accelerated in the early period and reduced in the late period. The corresponding sediments supply was limited,followed by a sudden increase during the late period. The hanging wall tilting rotations during the Es1-Ed periods led to the warped stratum. The both type and distribution of sediments were affected by the differential activities of boundary faults. The distribution of large-scale sand-body changed clockwise in a "north- northeast-east" direction. The superpositions of sedimentary units were influenced by the combination of secondary faults and fault slope-break zones.The results provide strong geological theory support for the prediction of sandstone reservoir distribution in Liuzan area,but also deepen the research on the formation mechanism of continental fault basin sandstone reservoir.

Key words: sequence architecture, sedimentary infill, differential fault activity, Shahejie Formation, Nanpu Sag

CLC Number: 

  • TE121.3
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