江汉盆地新沟嘴组页岩油储层物性发育主控因素

综合运用X-衍射、压汞及扫描电镜等资料，对江汉盆地丫角-新沟低凸起和陈沱口凹陷新沟嘴组页岩油储层储集空间类型及物性控制因素进行了探讨。研究结果表明：区内页岩油储层储集空间类型以无机孔隙（包括晶间孔、粒间孔、溶蚀孔）为主，也存在少量有机孔隙及微裂缝；区内泥质白云岩和白云岩孔渗条件最好；丫角-新沟低凸起和陈沱口凹陷页岩油储层均存在次生孔隙发育带，很好地改善了储层物性；矿物组分对丫角-新沟低凸起和陈沱口凹陷页岩油储层物性的影响存在差别，前者孔隙度与矿物组分无相关性，后者孔隙度与粘土矿物及碎屑矿物含量呈负相关性，而与白云石含量呈正相关性；区内渗透率均与碎屑矿物、粘土含量呈负相关性，与白云石含量呈正相关性。

Major controlling factors of poroperm characteristics of shale oil reservoirs in the Xingouzui Formation,Jianghan Basin

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.