Risk assessment of high maturity lacustrine shale oil reservoir based on pore-fracture connectivity and decane accessibility, Ordos Basin (China)

地质学 油页岩 岩石物理学 毛细管压力 致密油 地层评价 基质(化学分析) 岩石学 石油工程 岩土工程 多孔性 古生物学 材料科学 复合材料 多孔介质
作者
Jianjiang Wen,Mengdi Sun,Bingsong Yu,Mehdi Ostadhassan,Tomasz Blach,Yeping Ji,Phung Vu,Liliana de Campo,Chun‐Ming Wu,Jingfu Mu,Zijie Ren,Xin Tian,Zhejun Pan
出处
期刊:Marine and Petroleum Geology [Elsevier]
卷期号:168: 107043-107043 被引量:1
标识
DOI:10.1016/j.marpetgeo.2024.107043
摘要

Risk assessment in the exploitation of lacustrine shale oil reservoir requires a more comprehensive approach. This task was accomplished through a wide range of complementary tests, including (ultra) small-angle neutron scattering (USANS/SANS), mercury intrusion capillary pressure (MICP), and scanning electron microscopy imaging after Wood's Metal (WM) impregnation. As a result, two key petrophysical parameters—pore-fracture connectivity and fluid accessibility—were determined. These parameters would help us to predict shale oil reservoir quality and significantly reduce the risks associated with exploitation. Results indicated that the Hg/WM only slightly fills the matrix pores due to elastic deformation under high pressure, particularly in clays and organic matter. The presence of pores in various sizes, determined by USANS/SANS and MICP made us to classify them into non-permeable, potentially permeable and permeable pores, among which permeable pores accounted for the highest proportion of the pores (58.98-79.03%). However, due to the restrictions of the throats, fractures (> 10 μm) cannot effectively connect an important percentage of matrix pores, resulting in limited fluid flow. Moreover, the radius of gyration (Rg) obtained by contrast matching-SANS technique showed that oil molecules in the pore spaces of 2-110 nm are mainly in the adsorbed state. Collectively, such observations suggest that evaluating shale oil reservoirs, characterized by the above attributes, presents significant obstacles to efficient stimulation in production, making investment endeavors considerably challenging and risky.
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