Properties and shale oil potential of saline lacustrine shales in the Qianjiang Depression,Jianghan Basin,China |
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| Institution: | 1. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, China;2. Basin Structure Group, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK;3. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;4. Research Institute of Exploration and Development, Jianghan Oilfield Branch Company, SINOPEC, Wuhan 430223, China;1. Geological Survey of Canada, Calgary, AB, Canada;2. Department of Geosciences, University of Calgary, Calgary, AB, Canada;3. Encana Corporation, Calgary, AB, Canada;1. Geological Survey of Canada, 3303-33 Street NW, Calgary,Alberta T2L 2A7,Canada;2. China State Key Laboratory of Shale Oil and Shale Gas Resources and Effective Development, Sinopec Petroleum Exploration and Production Research Institute,31 Xueyuan Road, Haidian District, Beijing 100083,China;3. China University of Petroleum (Beijing), 18 Fuxue Road,Changping District, Beijng 102249,China;4. Sinopec Jianghan Oilfield Company,18 Daxueyuan Road, Gaoxin District, Wuhan, Hubei 430223, China |
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| Abstract: | The geochemical and petrographic characteristics of saline lacustrine shales from the Qianjiang Formation, Jianghan Basin were investigated by organic geochemical analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM) and low pressure nitrogen adsorption analysis. The results indicate that: the saline lacustrine shales of Eq3 member with high oil content are characterized by type I and type II oil-prone kerogen, variable TOC contents (1.0–10.0 wt%) and an early-maturity stage (Ro ranges between 0.41 and 0.76%). The mineral compositions of Eq3 saline shale show strong heterogeneity: brittle intervals with high contents of quartz and carbonate are frequently alternated with ductile intervals with high glauberite and clay contents. This combination might be beneficial for oil accumulation, but may cause significant challenges for the hydraulic stimulation strategy and long-term production of shale oil. The interparticle pores and intraparticle pores dominate the pore system of Eq3 shale, and organic matter hosted pores are absent. Widely distributed fractures, especially tectonic fractures, might play a key role in hydrocarbon migration and accumulation. The pore network is contributed to by both large size inorganic pores and abundant micro-factures, leading to a relatively high porosity (2.8–30.6%) and permeability (0.045–6.27 md) within the saline shale reservoir, which could enhance the flow ability and storage capacity of oil. The oil content (S1 × 100/TOC, mg HC/g TOC and S1, mg HC/g rock) and brittleness data demonstrate that the Eq33x section has both great potential for being a producible oil resource and hydraulic fracturing. Considering the hydrocarbon generation efficiency and properties of oil, the mature shale of Eq3 in the subsidence center of the Qianjiang Depression would be the most favorable zone for shale oil exploitation. |
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| Keywords: | Saline lake Shale oil Fracability Eocene Jianghan Basin |
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