四川盆地寒武系洗象池组储层基本特征及主控因素研究

发布时间：2018-04-18 11:15

本文选题：储层特征 + 颗粒白云岩　；参考：《石油实验地质》2017年05期

【摘要】：四川盆地寒武系天然气资源量大,上寒武统洗象池组作为一个极具潜力的含气层系,目前勘探程度整体较低,其储层特征及主控因素尚不明确,有待深入研究。利用岩心、薄片及分析化验资料对洗象池组储层岩石类型、储集空间、物性及发育控制因素进行综合研究,认为洗象池组储集岩主要为颗粒白云岩,其次为细(粉)晶白云岩;储集空间包括孔隙、溶洞和裂缝,储层类型为裂缝—孔隙(洞)型;物性总体表现为"低孔低渗"的特征,局部含高孔渗层段,储层非均质性较强。从分布特征上来看,洗象池组储层纵向叠置,横向连续性较差,川中地区往东到GT2井开始出现厚层储层,再向川东五百梯地区储层有所减薄。盆地边缘的习水、奉节一带储层成带分布,厚度较川中地区薄。储层发育受沉积相控制作用明显,颗粒滩发育区内储层发育程度较高,此外,建设性成岩作用及构造破裂作用也对储层发育有积极影响。
[Abstract]:The Cambrian natural gas resource in Sichuan basin is large. As a potential gas bearing system, the Upper Cambrian Xixiangchi formation has a relatively low exploration degree at present, and its reservoir characteristics and main controlling factors are not clear, which need to be further studied.The rock types, reservoir space, physical properties and development control factors of Xianghuchi formation reservoir are studied synthetically by using core, thin slice and analytical data. It is considered that the reservoir rock of Xianghuchi formation is mainly granular dolomite, followed by fine (powder) crystalline dolomite.The reservoir space includes pores, caverns and fractures, the reservoir type is fracture-pore (cave) type, and the physical property is characterized by "low porosity and low permeability", local high porosity and permeability section, and strong reservoir heterogeneity.According to the distribution characteristics, the reservoir of Xixiangchi formation is overlapped vertically and the horizontal continuity is poor. The thick reservoir appears from east to GT2 well in central Sichuan area, and then the reservoir is thinned to 500-ladder area in east Sichuan area.At the edge of the basin, the reservoir in Fengjie area is zoned and the thickness is thinner than that in the central Sichuan area.The reservoir development is obviously controlled by sedimentary facies, and the reservoir development degree is higher in the grain beach development area. In addition, constructive diagenesis and structural rupture also have a positive effect on reservoir development.
【作者单位】：中国石油西南油气田公司勘探开发研究院;油气藏地质及开发工程国家重点实验室(成都理工大学);
【基金】：国家科技重大专项“大型油气田及煤层气开发”(2011ZX05004-005)资助
【分类号】：P618.13

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