松辽盆地徐家围子断陷沙河子组储层特征研究  

Study on reservoir characteristics of Shahezi Formation in Xujiaweizi Fault Depression,Songliao Basin

作　　者：罗熙康 Luo Xikang(Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]成都理工大学,四川成都610059

出　　处：《能源与环保》2022年第11期96-101,106,共7页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：大庆油田科技重大专项(Dq-1204003201-js-318)。

摘　　要：储层特征不明确是目前制约研究区沙河子组油气突破的关键难题,通过综合运用薄片观察、扫描电镜、物性测试等多种手段,系统开展了研究区沙河子组储层特征研究。结果表明,岩石类型以长石质岩屑砂岩、岩屑质长石砂岩为主,不同区块存在差异;主要发育粒间溶孔、粒内溶孔和铸膜孔等孔隙类型。其中,徐东、徐西以粒间溶孔、微裂缝为主,安达地区以粒内溶孔、铸膜孔为主;物性差,属于特低孔、特低渗储层。储层发育受埋深、沉积相类型、岩性、成岩作用控制。不同因素控制作用存在差异,埋深、沉积相控制作用更强,扇三角洲前缘席状砂、扇三角洲前缘水下分流河道、辫状河三角洲前缘河口坝砂物性最好;凝灰质含砾砂岩、凝灰质砂岩、凝灰质含砾砂岩岩性孔隙度最高。建立研究区储层评价标准,优选Ⅰ类储层,该研究成果为徐家围子断陷沙河子组下部勘探指明方向。Unclear reservoir characteristics are the key problem that restricts the breakthrough of oil and gas in Shahezi Formation in the study area at present.Through comprehensive use of thin section observation,scanning electron microscopy,physical property testing and other means,the reservoir characteristics of Shahezi Formation in the study area have been systematically studied.The results show that the rock types are mainly feldspathic lithic sandstone and lithic arkose,and there are differences in different blocks.It mainly develops intergranular dissolved pore,intragranular dissolved pore and cast film pore.Among them,Xudong and Xuxi are dominated by intergranular dissolved pores and microcracks,while Anda area is dominated by intragranular dissolved pores and cast film pores;poor physical property,belonging to ultra-low porosity and ultra-low permeability reservoir.The reservoir development is controlled by burial depth,sedimentary facies type,lithology and diagenesis.The control effect of different factors is different.The burial depth and sedimentary facies have stronger control effects.The physical properties of sheet sand in fan delta front,underwater distributary channel in fan delta front,and mouth bar in braided river delta front are the best.The lithology porosity of tuffaceous gravelly sandstone,tuffaceous sandstone and tuffaceous gravelly sandstone is the highest.Establish reservoir evaluation criteria in the study area,and optimize ClassⅠreservoir.This research result points out the direction for exploration in the lower part of Shahezi Formation in Xujiaweizi fault depression.

关 键 词：沙河子组 储层 沉积作用 成岩作用 

分 类 号：TE122.2[石油与天然气工程—油气勘探]