川东北飞仙关组鲕滩沉积与成岩对储集层的控制  

Control of oolitic beaches sedimentation and diagenesis on reservoirs in Feixianguan Formation,northeastern Sichuan Basin

作　　者：赫云兰[1,2] 付孝悦[3] 刘波[2] 周明辉[3] 张学丰[2] 高计县[2] 杨云坤[2] 石开波[2] 

机构地区：[1]北京大学地球与空间科学学院 [2]北京大学石油与天然气研究中心 [3]中石化南方勘探开发分公司

出　　处：《石油勘探与开发》2012年第4期434-443,共10页Petroleum Exploration and Development

基　　金：国家科技重大专项(2011ZX05005-003-010HZ);国家自然科学青年基金(41002029)

摘　　要：通过连井对比、沉积相和微相划分、岩心观察、薄片分析等手段,对比分析了川东北普光、元坝地区鲕滩的沉积与成岩特征,并探讨它们对储集层的控制作用。结果表明,普光地区鲕滩沉积厚度大,不同层段垂向叠置,横向迁移距离小;而元坝地区鲕滩沉积厚度小,分布面积广,横向迁移距离远。普光和元坝地区鲕滩都经历了多种成岩作用,其中前者早期溶蚀作用较强,且发生了大范围的白云石化作用,发育高孔、高渗的Ⅰ类储集层;后者压实、压溶作用较强,晚期还发生了埋藏胶结作用,发育低孔、低渗的Ⅲ类储集层。古地形差异和相对海平面变化是造成沉积、成岩差异的主要原因。沉积作用控制储集层的分布和厚度,成岩作用决定储集层孔隙的形成与演化,并最终决定储集层的优劣。Based on well correlation, division of sedimentary facies and microfacies, core observation, and analysis of rock thin sections, the authors comparatively analyzed the sedimentation and diagenesis of the oolitic beaches in the Puguang and Yuanba areas of northeastern Sichuan Basin, and expounded their control on reservoirs. In the Puguang area the oolitic beach is thick and lateral migration distance is short, intervals overlaid one another, while in the Yuanba area the oolitic beach is thin and lateral migration distance is long. The two areas both experienced various types of diagenesis. There happened intense early dissolution and wide-spread dolomitization in the oolitic beach of the Puguang area, where type-I reservoirs of high porosity and permeability are developed. In the Yuanba area, strong compaction and pressure dissolution, and late burial cementation led to the development oftype-III reservoirs of low porosity and permeability. The main factors that control the sedimentation and diagenesis are paleotopography and changes in sea level. Sedimentation controls the distribution and thickness of reservoir, and diagenesis determines the porosity formation and evolution and ultimately the reservoir quality.

关 键 词：川东北 飞仙关组 鲕滩 沉积作用 成岩作用 

分 类 号：P631.4[天文地球—地质矿产勘探]