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Pore characteristics of continental shale and its impact on storage of shale oil in northern Songliao Basin
LI Jijun1,2, SHI Yinglin3, HUANG Zhenkai4, WANG Weiming1, CAO Qun3, LU Shuangfang1
(1.Research Institute of Unconventional Oil & Gas and Renewable Energy in China University of Petroleum, Qingdao 266580, China;2.State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum, Beijing 102249, China;3.College of Earth Sciences, Northeast Petroleum University, Daqing 163318, China;4.Institute of Petroleum Exploration and Development, SINOPEC, Beijing 100083, China)
Abstract:
Gas adsorption, high-pressure mercury injection and scanning electron microscopy were performed to study microscopic pore characteristics of the Cretaceous continental shale in the northern Songliao Basin.Rock pyrolysis, mineral composition analysis were combined to determine the control factors and impact on oil-bearing property of pore development. The results show that pores between flaky clay minerals predominate shale pores. The development extent of fracture is not high, and shale pores consist mainly of micropores and mesopores. Development extent of shale pore is controlled by buring depth and secondary pore development, and the organic pore is not of great importance to shale oil reservoir. If oil source is abundant, oil-bearing property of shale is mainly controlled by porosity, and pores with diameters larger than 20 nm are the main storage space. As a result, the "sweet spots" with large pores should be paid more attention to in the exploration and exploitation. At the junction of the southern Longhupao terrace and Qijia-Gulong sag, thin sandy mudstone and siltstone inter beds are well developed in Qingshankou Formation, which is favorable to be artificially fractured. In addition, shale in the formation has high secondary porosity and excellent oil-bearing property. Considering above factors, this area is the preferable target for exploration and exploitation of shale oil in the northern Songliao Basin.
Key words:  Songliao Basin  shale oil  pore  specific surface area  oil-bearing property