At the late diagenesis phase , the dissolution of frame grains , especially the dissolution of felspar and laumontite , is the key to form secondary porosity 朵状砂体的大小直接控制油藏的范围及规模，靖安地区的主要油藏多沿不同的朵状体成排分布。
2.
After analyzing of the whole situation , granularity is smaller . the lithology of chang 6 oil - bearing is a set of felspar sandstone . little of them are rock - scraps felspar sandstone 通过研究发现延长组6段储层砂岩为一套中?细粒长石砂岩及少量粉砂岩，油层组砂岩远离物源区，成分单一，表明其物源稳定。
