辽河西部凹陷西斜坡沙四段储层特征及成岩作用对其影响  

Reservoir Characteristics and the Effect of Diagenesis on E_2s_4 Reservoir in the West Slope of West Depression,Liaohe Oilfield

作　　者：刘圣乾 姜在兴[1] 王夏斌[1] 陈骥[1] 高艺[1] 吴明昊[1] 孙晓玮[1] 栾天思 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中国地质大学(北京)海洋学院,北京100083

出　　处：《现代地质》2015年第3期692-701,共10页Geoscience

基　　金：国家科技重大专项(2011ZX05009-002)

摘　　要：通过对岩石薄片及铸体薄片的观察和分析,结合大量物性及压汞分析资料,对辽河西部凹陷西斜坡沙四段砂岩储层的岩石学特征、成岩作用及储层物性特点进行了研究。结果表明,研究区岩石类型以长石岩屑砂岩和岩屑砂岩为主,常见压实、胶结、交代、溶蚀、蚀变等成岩作用类型;常见孔隙类型有原生粒间孔、粒间溶孔、粒内溶孔等,其中粒间扩大孔隙最常见;孔隙结构主要为细-中孔细喉型,储层类型主要为中孔低-中渗型,储层物性较好。主要分析了成岩作用对储层发育的影响,压实和胶结作用对储层具有破坏性作用,溶蚀作用对改善储层物性具有建设性作用。溶蚀作用形成的粒间溶孔、粒内溶孔、粒间扩大孔及超大孔隙对储层的贡献最大,形成了中-粗孔、中-高渗型优质储层。900~1 900 m和2 300~2 900 m深度段为孔隙度和渗透率异常带,带内溶蚀作用发育,在其中寻找有利的储层应当成为下一步勘探的重点目标。Based on the observation and analysis of rock thin sections,cast thin sections,physical properties and intrusive mercury curves of cores derived from sandstone reservoirs（ E2s4） in the west slope of west depression of Liaohe oilfield,the lithology,diagenesis and physical properties of E2s4 were analyzed. The results show that the main lithological types are feldspathic lithic sandstone and lithic sandstone in the study area,and the common diagenesis types are compaction,cementation,metasomatism,dissolution and alteration; pore types mainly include primary intergranular pore,intergranular dissolved pore and intragranular dissolved pore,among which the expanded intergranular pore is the most common type; pore structure types are mainly finemedium pores with fine throat and the physical property of reservoirs is good with medium-low porosity and medium permeability. The influence of diagenesis on reservoir development shows that compaction and cementation have destructive effect while dissolution plays a constructive role in improving reservoir property. This study indicates that intergranular dissolved pore,intragranular dissolved pore,expanded intergranular pore and oversize macropore formed by dissolution make the greatest contribution to the reservoir,resulting in theformation of high quality reservoirs with medium-high porosity and medium-high permeability. Two abnormal high porosity-permeability intervals in which dissolution widely develops are identified in depths of 900-1,900 meters and 2,300- 2,900 meters,and these two intervals should be the focus of next exploration targets to find favorable reservoirs.

关 键 词：成岩作用 储层物性 孔隙结构 西部凹陷西斜坡 辽河油田 

分 类 号：TE122.2[石油与天然气工程—油气勘探]