石油与天然气地质 ›› 1995, Vol. 16 ›› Issue (1): 45-54.doi: 10.11743/ogg19950106

• 论文 • 上一篇    下一篇

陕甘宁盆地东缘上马家沟组五段一亚段小层划分及与盆内地层的对比

徐论勋, 王宝清   

  1. 江汉石油学院, 湖北荆沙, 434102
  • 收稿日期:1994-07-15 修回日期:1994-11-07 出版日期:1995-03-25 发布日期:2012-01-16

STRATIGRAPHIC CLASSIFICATION AND CORRELATION OF 1ST SUBMEMBER OF 5TH MEMBER,UPPER MAJIAGOU FORMATION IN EAST MARGIN OF SHAANGANNING BASIN

Xu Lunxun, Wang Baoqing   

  1. Jianghan Petroleum institute, Jingstha, Hubei
  • Received:1994-07-15 Revised:1994-11-07 Online:1995-03-25 Published:2012-01-16

PDF (PC)

624

被引次数

4

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：马五11层富高岭石,不合绿泥石,少含伊利石；马五21层伊利石、高岭石较丰,基本不含绿泥石；马五31层基本不含粘土矿物；马五41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。

关键词: 陕甘宁盆地, 奥陶系, 上马家沟组, 小层划分, 地层对比, 标志层

Abstract:

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(M511,M521,M531 and M541),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.M511 is rich in kaolinite,poor in illite and has no chlorite;M521 has plenty of illite and kaolinite but no chlorite;M531 contains almost no clay minerals;in M541,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.