南方陆相盆地油气储集性能分析

RESERVIOR PROPERTY OF THE CONTINENTAL BASINS IN SOUTHERN CHINA

可分为碎屑岩和火山岩两大储集岩类。前者在各中、新生代陆相盆地普遍发育,其中以第三系砂岩的储集性能最好,一般具中等以上。火山岩储集层主要分布于华南板块火山弧内及弧后中、新生代盆地和与之相邻的少数盆地,以第三系蚀变杏仁状橄榄玄武岩的储集性能最优。影响储集层物性的因素较多,其中沉积相是起控制作用的先天条件,而成岩阶段的压实作用和胶结作用则是孔隙度、渗透率变化的主要原因。

There are two types of reservior rocks, clastic and volcanic, in these basins. The former is wide spread in each of the basins, with the Tertiary sandstone possessing the best reservior property, gen- erally being above the medium grade. The latter is mainly spread in the volcanic arc at the margin of South China Plate, the arc rear Mesozoic-Cenozoic continental basins, and some of their adjacent ones. Among which, the Tertiary altered amygdaloidal dorgalite takes the most advantageous reservior property. Many geologic factors could affect the property of reservior beds. The deposit facies is an inborn one of domina- tion. the compaction and cementation in diagenesis are the key ones for the changes of the porosity and permeability.