科研之友
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摘要
The pore structure and occurrence state of hydrocarbons in shale reservoirs are significant factors affecting shale oil production. However, how pore structure affects the occurrence of shale oil remains unclear. This paper aims at analyzing the major distribution space of shale oil with various physical states in shale pores using experimental approaches. Therefore, the original samples and solvent-extracted samples of lacustrine shale from the Permian Fengcheng Formation in Junggar Basin were investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Rock-Eval pyrolysis, and N-2 adsorption/desorption methods. The findings demonstrate that the Fengcheng shale has high oil content, with free oil accounting for 57.17% of the total oil yield. The pore size distribution characteristics of original and solvent-extracted shale samples indicate that shale oil is mainly stored in mesopore pores with diameters between 5 and 40 nm. The threshold limit of pore diameter for the movable oil in shale reservoirs is between 3.5 and 19 nm. Also, by comparing shale oil mobility in various basins, it is found that petroleum mobility occurs when the total oil yield in the shale reaches 6 mg HC/g Rock. Meanwhile, the threshold value of petroleum mobility in different basins is related to the pore shape. Parallel plate pores within shales are more favorable for petroleum mobility. This research presents the mobility of the shale oil threshold, which is critical for shale oil exploration and exploitation.
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