古龙南凹陷葡萄花油层储集空间及主控因素

针对松辽盆地古龙南地区葡萄花油层优质储层主控因素不清的问题，研究了古龙南地区葡萄花油层含油储层的岩石学特征、孔隙类型、面孔率特征及葡萄花优质储层孔隙发育的主要影响因素。研究结果表明，古龙南地区葡萄花含油储层发育原生粒间孔、粒间溶蚀扩大孔、粒内溶孔、晶间孔、微裂缝等多种孔隙，溶蚀孔隙占总孔隙的57.4%。不同沉积微相的孔隙类型及面孔率存在差异，席状砂的孔隙最发育，以碳酸盐胶溶孔和长石溶孔为主；水下分流河道砂体次之，河口坝砂体的原生孔隙和溶蚀孔面孔率分别为7.42%和5.33%；天然堤和决口扇砂体的孔隙相对最不发育。沉积作用、胶结作用和有机酸的溶蚀作用是控制古龙地区葡萄花油层优质储层发育的主要因素，刚性物质含量高、结构成熟度高有利于原生孔隙的发育和保存，长石、碳酸盐等易溶物质含量高有利于溶蚀孔发育，溶蚀作用是储层物性改善的最重要因素。

Storage Volume and Control Factors of the Putaohua Reservoir in the South Gulong Sag

Because the primary control factors of the high-quality Putaohua Oil Reservoir in the South Gulong Area of the Songliao Basin are uncertain, this research focused on the primary factors influencing the lithology, pore types, surface porosity characteristics, and pore development in this high-quality oil-bearing reservoir. The results show that various types of pores developed in the Putaohua Oil Reservoir including primary intergranular pores, intergranular corrosion-expanding pores, intergranular dissolution pores, intercrystalline pores, and microfractures; the corrosion pores account for 57.40% of all pore types. Differences in pore types and surface porosities exist in various types of sedimentary microfacies:sheet sand has the most developed pores, primarily carbonate cement dissolution pores and feldspar dissolution pores; estuary bar sandbodies are second, with the surface porosity of primary intergranular pores and dissolution pores of river mouth bar sandbodies accounting for 7.42% and 5.33%, respectively; natural embankments and crevasse splay sandbodies have the least developed pores. Sedimentation cementation and organic act dissolution are the primary factors controlling the development of the high-quality Putaohua Reservoir. The high content of rigid material and high structural maturity are beneficial for the development and preservation of primary intergranular pores. A high content of feldspar, carbonate, and other soluble materials is beneficial for the development of dissolution pores. Dissolution is the most important factor for the improvement of physical reservoir properties.