渤海海域蓬莱9-1花岗岩潜山大型油气田储层发育特征与主控因素

doi:10.11743/ogg20150211

Abstract

Abstract: Penglai 9-1 oilfield has been the first large-scale field found in weathering crust reservoirs of the Mesozoic bu-ried granite hills in coast waters of China in recent years.In this brand new area of exploration,reservoir characterization and its forming mechanism are considered essential for efficient and successful exploration.Thin section,SEM,and clay mineral X-diffraction analyses were combined with logging data to provide insight into uncertainties of the area.The results show that the buried granite hills can be divided into soil zone,sand-conglomerate weathering zone,fracture zone and base rock zone,and reservoiring space in them changes in a regular pattern from pore to fracture-pore,pore-fracture and fracture,from the surface to the center as weathering and leaching gradually weaken.Horizontally,granite reservoirs are continuously and widely distributed and paralleled to the top of the buried hills.Thicker reservoirs are mainly developed near large-scale faults with intensive activities and paleogeomorphic slope areas.The paper proposes that the reservoirs were controlled mainly by epigenic karstification,organic acid dissolution,structural deformation and micro-palaeogeomorphology.The significance of the understanding may be felt in the future exploration and development of oil and gas in weathering curst reservoirs of buried granite hills intruded during Yanshan period.

Key words: weathering crust, buried granite hill, Yanshanian, Penglai 9-1 oilfield, Bohai Sea

CLC Number:

TE122.2

Wang Xin, Zhou Xinhuai, Xu Guosheng, Liu Pengbo, Gao Kunshun, Guan Dayong. Characteristics and controlling factors of reservoirs in Penglai 9-1 large-scale oilfield in buried granite hills, Bohai Sea[J]. Oil & Gas Geology, 2015, 36(2): 262-270.

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Characteristics and controlling factors of reservoirs in Penglai 9-1 large-scale oilfield in buried granite hills, Bohai Sea

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