石油与天然气地质 ›› 1988, Vol. 9 ›› Issue (1): 11-21.doi: 10.11743/ogg19880102

• 论文 • 上一篇    下一篇

沾化凹陷东北部下第三系近岸浊积扇砂体储集空间的成因、分布及其意义

杜韫华, 蔡进功   

  1. 胜利油田地质科学研究院
  • 收稿日期:1987-02-02 出版日期:1988-03-25 发布日期:2012-01-16

THE DISTRIBUTION AND ORIGIN OF RESERVOIR SPACES ON THE EOGENE OFFSHORE TURBIDITE FAN IN THE ZHANHUA DEPRESSION

Du Yunhua, Cai Jingong   

  1. Geological Research Institute of Shengli Oilfield
  • Received:1987-02-02 Online:1988-03-25 Published:2012-01-16

摘要:

研究区近岸浊积扇储集空间为次生成因,不随深度的加大而变差,在深层仍保持良好的储集空间。这种特殊性决定于:(1)早、中期碳酸盐胶结物及尔后的交代矿物为次生孔隙的形成提供潜在空间;(2)近封闭的沉积体系提供了极丰富的水溶液;(3)斜长石、钾长石溶解孔隙的消长交替。近岸浊积扇的辫状沟道相为油气勘探的主要对象。

Abstract:

The sandbodies of offshore turbidite fan in the Zhanhua Depression with a buried depth of 3200-3640m are located in a sealed environment around by argillic source rocks. The reservoir spaces are of secondary origin, and porosity is relatively high and stable within the extent of studied depth. The reasons that porosity does not vary with the buried depth are that:1. The existance of carbonate cements and the replacing minerals in the early and middle stages of diagenesis provided large amounts of spaces for the formation of the secondarypores;2. A nearly closed sedimentary system prepared abundant acidic water solution;3. The minerals themselves produced the condition of physical-chemical solution. At about the buried depth of 3211m, plagioclase dissolution reduced due to albitization while the dissolving pores of potash feldspar increased remarkably. This relationship between growth and extinction constituted the main cause of the relative stability of the porosity. The microfacies of braided channels in the offshore turbidite fans are the major targets for hydrocarbon exploration owing to sandstones with great thickness, lower content of mud and higher isotropy.