川中东北部龙岗地区中三叠统雷四3亚段储层特征及控制因素研究

对龙岗地区中三叠统雷口坡组雷四3 亚段储层的研究，有助于认识受雷口坡组顶部不整合面风化壳影响的储层特征，并可通过与邻区对比，分析该区域不整合面对四川盆地其他地区雷口坡组顶部储层的影响。根据岩心观察与描述、薄片鉴定和锶同位素测试，结合测井与储层物性等资料，论述了龙岗地区雷四3 亚段储层特征及控制因素。同时，简要讨论了四川盆地不同地区雷四3 亚段的储层特征及控制 因素。结果表明，龙岗地区雷四3 亚段储层的岩性主要为膏溶角砾状白云岩与颗粒白云岩，储层物性总体较差，储集空间主要为膏溶铸模孔、粒间（内）溶孔及晶间（溶）孔，储层控制因素主要为蒸发台地相膏岩和台地内局部微地貌高地颗粒岩的沉积作用、印支期抬升后的表生岩溶作用与充填作用。在紧邻龙岗的元坝地区，雷四段储层具有与龙岗地区相似的特征与控制因素；川西坳陷中部和川西坳陷南部则与龙岗地区不同，其顶部地层受印支期不整合面岩溶作用影响减弱，储层分别受控于台地边缘微生物礁滩相与海平面升降控制的颗粒滩相沉积作用。

Reservoir characteristics and controlling factors of Middle Triassic T2l43 in Longgang area

of gypsum rock in evaporative carbonate platform and sedimentation of gypsum, granular carbonate rocks controlled by paleo geomorphology in the carbonate platform, epigenic karstification and infilling after Indosinian tectonic uplift.The reservoir physical property is generally poor. Regionally, the reservoir characteristics in neighboring Yuanba area is similar to that in Longgang area, but it is different from that in the middle and southern West Sichuan Depression with the epigenic karstification decreases. As a result of eustatic movement, the reservoirs are controlled respectively by microbial reefs （beaches） and granular beaches in the middle and southern West Sichuan Depression