三塘湖盆地碎屑岩成岩系统及孔隙演化

THE CLASTIC DIAGENETIC SYSTEMS AND THE EVOLUTION OF PORES IN SANTANGHU BASIN

针对三塘湖盆地碎屑岩储集层中,溶蚀作用并不一定引起孔隙度的增大以及胶结作用并不一定引起孔隙度的减小的异常情况,本文根据碎屑岩储层中各种成岩作用、自生矿物组合及粘土矿物的纵向变化的特点,展开成岩作用与孔隙演化的分析研究。通过自定义成岩系统这一概念,建立了碎屑岩成岩系统的分类,提出了孔隙演化受成岩系统控制的观点,并以三塘湖盆地牛圈湖背斜为例,运用该理论对有利孔隙带进行了预测,为在该盆地内寻找有利油气勘探目标提供了有效的理论依据。

In view of the abnormal situation, that is corrosion didnt surely cause the increase of porosity and cementation the decrease of porosity in the clastic reservoir Santanghu basin, the relation between diageneses and evolution of pores was investigated on the basis of the vertical characteristics of the various diageneses, authigenic mineral combination and clay mineral. The classification of clastic diagenetic systems was established, and the viewpoint that evolution of pores was controlled by diagenetic systems was put forward through self - defining the concept of diagenetic system. Taking the Niujuanhu anticline in Santanghu basin as an example, the favorable porous zone was predicted by use of this theory, which provided effective theoretical base for the seeking of exploration targets in this basin.