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Geoscience ›› 2018, Vol. 32 ›› Issue (01): 162-172.DOI: 10.19657/j.geoscience.1000-8527.2018.01.16

• Oil & Gas Exploration and Development • Previous Articles     Next Articles

Sedimentary Facies and Sandbody Depiction of the Huagang Formation of H Structural Group and Its Adjacent Areas in Xihu Depression

HE Miao(), HOU Guowei, QIN Lanzhi, LU Yan, XIE Jingjing   

  1. Shanghai Branch, CNOOC Ltd., Shanghai 200335, China
  • Received:2017-01-09 Revised:2017-05-07 Online:2018-02-10 Published:2018-02-05

Abstract:

H structural group and its adjacent areas of Xihu Depression were formed under the background of huge extrusion and reversion, which located near the rich depression and proved to have potential oil and gas. In order to find the beneficial areas and the rich sand strata, this paper combines the characteristics of seismic reflection, FMI logging data, lithology data and paleontology data to do research on sedimentary background, considering that the Huagang Formation deposits under moderate hydrodynamic force and is affected by multidirection fluid. The pollen and other paleontological association suggest that Huagang Formation is under fresh water environment. According to logging and coring data, it is proved that the Huagang Formation develops anastomosing river deposits, and anastomosing channels, cross bar and vertical bar are well-developed among those microfacies. Furthermore, combining the well-to-well correlation and seismic profiles together, the vertical overlap and planar distribution characteristics of sandbodies are analyzed, indicating that the single-jointed, multilateral-jointed and incomplete folded sandboies are mainly deposited, and the planar sandbodies are mainly stripe, cross-linking stripe and net shaped. It is proved that the deep-deposited sandbodies have a great potential.

Key words: Xihu Depression, Huagang Formation, sedimentation, microfacies, sandbody

CLC Number: