Characteristics and distribution pattern of the covered buried-hill reservoirs in Shijiutuo-Liaoxi uplift,Bohai Sea
GE Daoyao1,2, GONG Chenglin1,2, ZHANG Xintao3, YANG Fan1,2, YU Yixin1,2, CHEN Yuhang4
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 2 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China; 3 Exploration Department of CNOOC China Limited,Beijing 100010,China; 4 Research Institute of Petroleum Exploration and Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China
Abstract：The Archaean covered buried hills with great potential are developed in the Bohai sea area. The characteristics and distribution pattern of such buried-hill reservoirs are the focus and difficulty in the current research of buried-hill oil and gas exploration. Using seismic data,well-log data,thin sections,sidewall cores,conventional physical property,scanning electron microscopy and X diffraction,the current research explored the characteristics,controlling factors and documented distribution patterns of Archaean covered buried-hill reservoirs in Shijiutuo-Liaoxi uplift of the Bohai Bay Basin,resulting in five main lines of observations and results. First,observations from the current study suggest that the documented Archaean buried hills is composed mainly of mixed granites and developed various types of dissolution pores and fractures,among which structural fractures are the most important reservoir space. The reservoir has an average porosity of 2.2% and average permeability of 0.445×10-3 μm2. The Archaean covered buried-hill reservoirs are composed from base to top of weathered clay zone,weathered conglomerate zone,weathered fracture zone,fracture-developed zone,tight zone and bedrock zone. Second,rocks rich in felsic minerals provided the material basis for the formation of fractured reservoirs. Higher felsic content is conducive to fracture formation and weathering,leaching and dissolution. Third,multi-stage tectonics are key to the formation of large-scale fractured,buried-hill reservoirs. The strong uplift of Indosinian and Yanshanian is the necessary condition for the formation of high-quality weathered crust reservoirs. More specifically,the development of fractures was affected by the different structural positions and the distance between the buried-hill reservoirs and main faults(i.e. the Indosinian and Yanshanian faults). Fourth,weathering and leaching of atmospheric fresh water facilitated the reworking of fractured and is the main factor controlling the vertical zonation of reservoirs. Fifth,the distribution pattern of Archaean covered buried-hill reservoirs was established. The overlapped fracture zones in weathered fracture zones and fracture-developed zones represent two main zones for the development of high-quality buried-hill reservoirs. The thickness of weathering crust of two-story buried hill is larger. The thickness of inner fracture zone is larger and the fracture-developed zone and fracture zone of buried hill are more densely developed in the superposition area of multi-stage tectonic activity.
GE Daoyao,GONG Chenglin,ZHANG Xintao et al. Characteristics and distribution pattern of the covered buried-hill reservoirs in Shijiutuo-Liaoxi uplift,Bohai Sea[J]. JOPC, 2023, 25(1): 198-214.
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