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综合应用测井资料、岩石薄片、扫描电镜、X-衍射等资料,对五蛟地区长81储层进行研究。结果表明:五蛟地区长81储层主要发育砂岩类型为细粒岩屑长石砂岩,属于低孔-超低渗储层,发育粒间孔和溶蚀孔,孔喉结构类型属小孔隙,微细喉道型,沉积作用以及成岩作用影响研究区长81储层的物性,使得河道侧翼的物性明显差于水下分流河道和河口砂坝的物性,而溶蚀作用产生的次生孔隙使储层物性得到改善。根据储层物性和孔隙结构参数,将研究区储层分为4类,研究区长81储层主要以Ⅱ类和Ⅲ类为主。
Comprehensive application of logging data, thin slices of rock, scanning electron microscopy, X-ray diffraction and other data to study the Chang 81 reservoir in Wujiao area. The results show that the main sandstone type of Chang 81 reservoir in Wujiao area is fine-grained feldspathic sandstone, belonging to low-porosity and ultra-low permeability reservoirs, developing intergranular pores and dissolution pores. The pore-throat structure is of small pore size and fine Throat type, sedimentation and diagenesis affect the physical properties of Chang 81 reservoirs, making the physical properties of the flanks of the riverway significantly worse than that of the submarine distributary channel and estuary sand bar. However, the secondary porosity caused by dissolution makes the reservoir properties Improved. According to reservoir physical properties and pore structure parameters, the reservoirs in the study area are divided into four types. The main reservoirs of Chang 81 reservoir are mainly Class II and Class III reservoirs.