Abstract: Based on the integrated analysis of X-ray diffraction,high-pressure mercury and scanning electronic microscope,this paper discusses space types and controlling factors of the shale oil reservoir in the Xingouzui Formation in the Yajiao-Xingou Low Uplift and the Chentuokou Sag of the Jianghan Basin.The results show that inorganic pores (including intercrystalline pores,intergranular pores and dissolved pores) are the main reservoir space of the shale oil reservoir.There also exist a small amount of organic pores and micro fractures.Porosity and permeability of the argillaceous dolomite and the dolomite are the best in the study area.Secondary pores are well developed in shale oil reservoirs both in the Yajiao-Xingou Low Uplift and the Chentuokou Sag,improving the poroperm characteristics.The influences of the mineral components on the reservoir poroperm characteristics are different between the Yajiao-Xingou Low Uplift and the Chentuokou Sag.The porosity of shale oil reservoir in the former has no relationship with mineral components, while that in the latter area is negatively correlated with the content of clay minerals and detrital minerals but positively correlated with the content of the dolomite.Meanwhile, the permeability is negatively correlated with the content of detrital and clay minerals,but positively correlated with the content of the dolomite in both areas.

Key words: reservoir space, diagenesis, argillaceous dolomite, shale oil, Xingouzui Formation, Jianghan Basin