桩海地区下古生界潜山储层发育规律与发育模式

THE MODEL AND LAW OF THE RESERVOIR DEVELOPMENT FOR THE CARBONATE BURIED-HILLS OF LOWER PALAEOZOIC RESERVOIR IN JIYANG SAG,ZHUANGXI- CHENGDAO DISTRICT

桩海地区位于济阳坳陷渤海湾南部极浅海地区。下古生界包括寒武系和下、中奥陶统,主要由海相碳酸盐岩构成。古潜山主要发育风化壳岩溶带储层和内幕储层。下古生界碳酸盐岩裂缝-溶蚀型储集层的发育特征以有无上古覆盖是岩溶发育的前提;古地貌、古水系控制岩溶发育强度。其发育规律为:岩溶作用是下古生界储集层发育的基础;岩性和断裂作用决定内幕储层的形成与发育。主要以岩溶作用产生的背景与条件、发展或消亡过程为主线,辅以断裂与裂缝对储层的改造作用,分2个层次建立了下古生界碳酸盐岩储层的发育模式。经钻采实践检验,储层发育规律与建立的储层发育模式均得到证实。

Zhuanghai district is located in the south of neritic area in Bohai gulf. The Lower Palaeozoic group mainly includes Cambrian,medial and lower Ordovician,which are marine carbonate in the district, The buried-hills mainly develope two kinds of reservoir,one is related to the crust of weathering and karst zone,the other is to lithology. The formation of carbonate reservior is controlled by the overlaid C-P strata and the intensity of karstification which was related to the palaeo geomorphy and palaeodrainage system. It was considered that karstification is the base of reservior formation,and lithology and faulting control the formation and development of internal reservior. Accordingly, the development model of Low Palaeozoic carbonate reservoir is established. This model was proved througy practical drilling.