摘要
下奥陶统上马家沟组五段一工段是陕甘宁盆地的主力气层，进一步的细分及与盆内井下地层的对比．关系到储层非均质性地质模型的正确建立。以山西兴县关家崖露头剖面的研究为基础，选择Ｋ１石膏假晶层、Ｋ２凝灰岩层为主要标志层，ａ、ｂ、ｃ三个大套碳酸盐岩中的泥质岩为辅助标志层，将马五段一工段分为四个小层。四个小层的分界线在化学元素曲线上与尖峰值相对应，并分别构成不同的粘土矿物组合：马五层富高岭石，不合绿泥石，少含伊利石；马五层伊利石、高岭石较丰，基本不含绿泥石；马五层基本不含粘土矿物；马五层高岭石、伊利石和绿泥石三者兼备。这种四分的标志和特征，在盆内井下亦有其踪迹和明显的反映，可以作为小层划分、对比的依据和标志。
The 1st submember of the 5th member of Upper Majiagou Formation in the Lower Or dovician is the main reservoir of Shaanganning Basin,and its subdivision and corrlation with subsurface counterpart within the basin benefit the establishment of nonhomogeneous geo logical model.Based on the study of the outcrop in Guanjiaya, Xingxian of Shanxi Province.gypsum.pseudocrystal layer(K1) and tuff layer(K2) were selected as the main marker horizons,and the argillaceous rock ina,b,c suites of carbonate rocks as subsidiary marker horizions,then the first submember(M51) could be subdivided into four beds(M5,M5,M5 and M5),the result suggest that the bounderies of the beds correspond with the peaks of the curves of their chemical elements,and the beds constitute different clay mineral assemblages.M5 is rich in kaolinite,poor in illite and has no chlorite;M5 has plenty of illite and kaolinite but no chlorite;M5 contains almost no clay minerals;in M5,kaonite,illite and chlorite could all be found.The different marks and characteristics of the four beds could be seen clearly in well drilling within the basin.therefore they may be considered as foundation and markers for bed subdivision and correlation.
出处
《石油与天然气地质》
CSCD
北大核心
1995年第1期45-54,共10页
Oil & Gas Geology
