摘要
运用沉积地质及层序地层对塔河油田南部奥陶系中统一间房组发育的一套碳酸盐岩进行分析,结果表明:从岩石组合特征上可分为上下两段,下段为(砂)砾屑灰岩+藻鲕灰岩+鲕粒灰岩,底栖生物丰富;上段为海绵礁灰岩+藻粘结灰岩,生物骨架灰岩及斑状砾屑灰岩。纵向上,构成了一个建滩沉积序列和一个造礁沉积序列,沉积环境为台地浅滩-台内礁。沉积微相为开阔碳酸盐台地,包括海绵礁、浅滩及滩间;储渗空间以溶蚀孔隙、溶蚀孔洞、溶蚀洞穴和裂缝等为主。塔河油田南部一间房组碳酸盐岩经历的海西早期岩溶也叠加了加里东中期第一幕岩溶的影响,(准)同沉积期加里东中期第一幕岩溶,对一间房组酸盐岩储集性改善具重要意义。
The carbonate rocks of the Yijianfang Formation of Ordovician in the Yanxia region of south Tahe oilfield are one of the principal producing formation of oil and gas. In the vertical direction, it developed two sedimentary sequence of bank-reef, and it is platform edge shallow-platform reef facies. Yijianfang Formation can be divided into two parts, the lower and upper part. Both the lower and upper parts of Yijianfang Formation are open platform during the depositional stage, which include some microfacies like sponge reef, shoal, interbank and so on. There exists a little difference between the two parts. The main space of accumulation and permeation is pores as well as fractures. The Yijianfang Formation experienced 2 periods of karst formation in the late Hercynian and middle Caledonian respectively. The karst event of middle Caledonian greatly improved the accumulation ability of carbonate of the Yijianfang Formation.
出处
《矿物岩石》
CAS
CSCD
北大核心
2008年第2期95-101,共7页
Mineralogy and Petrology
