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致密砂岩储层的研究中,可动流体赋存特征因能表征储层孔隙中流体的流动规律而备受重视。以鄂尔多斯盆地苏里格气田西区下石盒子组盒8段、山西组山1段核磁共振测试样品为研究对象,结合铸体薄片、扫描电镜、阴极发光、恒速压汞、黏土矿物X-射线衍射、高压压汞及气水相渗实验分析了研究区储层可动流体赋存特征,开展了可动流体赋存特征的影响因素研究。结果表明:研究区储层依据孔隙组合类型可分为粒间孔—溶孔型储层、溶孔—晶间孔型储层及孔隙+裂缝型储层,可动流体赋存能力及大孔喉发育情况依次变差;喉道越大且孔喉均质程度越好可动流体饱和度越高;储层亲水性能力提高造成水膜厚度增大导致喉道缩小甚至阻塞,可动流体饱和度降低。测井解释含气性与孔隙组合类型对应良好,为致密砂岩储层含气性评价提供了直接依据。
In the study of tight sandstone reservoirs, the characteristics of the movable fluid reservoirs have drawn much attention because they can characterize the fluid flow in the reservoir pores. In this study, the nuclear magnetic resonance test samples of Xiashihezi Formation Box 8, West Shanxi Formation in the western Sulige gas field of Ordos Basin were taken as research objects. Combining with casting thin film, SEM, cathodoluminescence, constant pressure mercury intrusion, clay mineral X-ray Diffraction, high pressure mercury intrusion and gas-water infiltration experiments were used to analyze the occurrence characteristics of the movable fluid in the reservoir and to study the influencing factors of the occurrence characteristics of the movable fluid. The results show that the reservoirs in the study area can be divided into intergranular pore-pore type reservoirs, dissolved pore-intergranular pore type reservoirs, and pore-type fractured reservoirs according to the types of pore assemblages in the study area. The reservoirs for movable fluids and large pores Laryngeal development in turn become worse; the larger the throat and the pore throat homogeneity is better, the higher the saturation of the movable fluid; reservoir hydrophilic ability to increase the thickness of the water film causes the throat to narrow or even block, the movable fluid Saturation decreases. Logging gas genera- tion corresponds well to the type of pore assemblage, providing a direct basis for the evaluation of gas-bearing properties of tight sandstone reservoirs.