Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (2): 103-114.doi: 10.12108/yxyqc.20250210

• PETROLEUM EXPLORATION • Previous Articles    

Sedimentary characteristics of the middle member Pinghu Formation of Eocene in Kongqueting area, Xihu Sag, East China Sea Shelf Basin

CHEN Shenghua1, WANG Jianwei2, LIU Shu2, YAN Shumei2, HAN Jianhui1, FU Heng1, XIE Caizhu1, SUN Li2   

  1. 1. College of Energy, Chengdu University of Technology, Sichuan, Chengdu, 610059, China;
    2. Exploration and Development Research Institute of Sinopec Shanghai Ocean Oil & Gas Breach, Shanghai, 200120, China
  • Received:2024-07-10 Revised:2024-10-28 Published:2025-03-06

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Abstract: The middle member Pinghu Formation in the Eocene strata on the western slope of the Xihu Sag within the East China Sea Shelf Basin，specifically within the Kongqueting Block，is the primary oil and gas reservoir. However，systematic studies of the detailed sedimentary evolution and sand body distribution within the third-order sequence framework in this block remain lacking，limiting the effectiveness of oilfield development. By integrating lithology，well logs，and high-resolution 3D seismic data，the sedimentary system and sand body distribution of middle member Pinghu Formation in the Eocene strata on the western slope of the Xihu Sag within the East China Sea Shelf Basin were characterized using methods such as paleo-geomorphology restoration，seismic facies identification，and attribute integration through a stepwise regression model. The results show that： （1）In terms of sequence stratigraphy，a secondary sequence and five tertiary sequences can be identified within the Pinghu Formation. The ancient topography within this sequence framework was characterized by a northwestsoutheast gradient of stepped deepening，and sediments in the study area were derived from the northwestern continental margin uplift.（2）The middle member Pinghu Formation is located in the highstand systems tract（HST） of a third-order sequence，primarily developing a braided river delta-barrier coastal depositional system. This system can be further subdivided into four sub-facies—delta plain，delta front，prodelta，and tidal flat.（3）The macroscopic boundaries of sand body distribution，showing that sand bodies primarily develop within three microfacies：delta plain distributary channels，delta front subaqueous distributary channels，and mouth bars. The middle member Pinghu Formation primarily develops three sand layers，P8，P7，and P6，corresponding to three fourth-order cycles within the highstand systems tract（SQE2p3）of the middle Pinghu section. The development sequence begins with P8 at the maximum flooding surface，followed by P7 in the mid-highstand phase，and then P6 in the late highstand phase.

Key words: sequence stratigraphy, distributary channel, subaqueous distributary channels, mouth bars, seismic attributes, Pinghu Formation, Eocene, Kongqueting area, Xihu sag, East China Sea Shelf Basin

CLC Number: 

  • TE122.2
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