苏49区块上古生界盒8段岩石学特征及储层物性成因分析  

Petrologic characteristics of Upper Paleozoic He 8 Member and genetic analysis of reservoir physical properties in Su 49 block

作　　者：王思博 刘智恪 吕双 夏林 朱振文 WANG Sibo;LIU Zhike;LYU Shuang;XIA Lin;ZHU Zhenwen(Downhole Technology Service Company,BHDC,CNPC,Tianjin 300280,China;Oil&Gas Cooperation and Development Company,BHDC,CNPC,Tianjin 300457,China)

机构地区：[1]中国石油渤海钻探井下技术服务公司 [2]中国石油渤海钻探油气合作开发分公司

出　　处：《录井工程》2025年第1期155-160,共6页Mud Logging Engineering

摘　　要：为深入了解苏49区块上古生界盒8段储层的地质特性和储层特征,应用取心观察描述、铸体薄片、扫描电镜、阴极发光等试验研究资料,从岩石学特征、孔隙类型、孔喉特征及成岩作用等方面对盒8段储层开展了系统研究。结果显示:盒8段储层岩石类型以岩屑石英砂岩、石英砂岩为主,碎屑成分主要为石英类(石英、燧石),其次为岩屑组分,局部见少量长石颗粒;孔隙类型以次生孔隙为主,原生粒间孔隙次之,且以发育小孔喉为主,盒8下亚段物性较好,平均孔隙度和渗透率分别为8.15%、0.58mD,盒8上亚段物性次之,说明研究区盒8段储层属于致密特低渗砂岩储层;盒8段主要有压实、胶结和溶蚀3种成岩作用,其中溶蚀作用形成的高岭石晶间孔和溶蚀孔对储层物性具有明显改善作用;微裂缝对区块中、东部储层物性有较大的改善。研究成果有助于更好地理解该区域天然气储存规律,为储层改造和高效开发提供科学依据,从而助力区块产能建设和开发。In order to deeply understand the geological characteristics and reservoir characteristics of He 8 Member reservoirs from the Upper Paleozoic in Su 49 block,a systematic study of the reservoirs of it has been carried out from the perspectives of petrologic characteristics,pore types,porethroat characteristics,and diagenesis by using core observation descriptions,casting thin sections,scanning electron microscope,cathodeluminescence and other experimental analysis data.The results show that the main rock types in He 8 Member reservoirs are lithic quartz sandstone and quartz sandstone,and the reservoir clast composition is mainly quartz(including quartz and flint),followed by cuttings components,and there are some trace amounts of feldspar particles in some areas.The pore type in the study area is secondary pore,and the primary intergranular pore occupies a secondary position,and mainly characterized by the development of small pore throats.The lower submember of He 8 Member has good physical properties,with an average porosity of 8.15%and an average permeability of 0.58 mD.The physical properties of the upper submember of He 8 Member are second,indicating that the reservoirs of He 8 Member in the study area belong to tight ultralow permeability sandstone reservoirs.The main diagenesis in He 8 Member includes compaction,cementation,and dissolution,of which the dissolutionformed kaolinite intercrystal pores and dissolution pores have a significant improvement effect on the reservoir physical properties.Microfractures have greatly improved the physical properties of reservoirs in the central and eastern parts of the block.The results of this study will help us better understand the natural gas storage rule in the area,provide scientific basis for reservoir stimulation and efficient development,and thus support the productivity construction and efficient development of the block.

关 键 词：岩石学特征 储层物性 苏49区块 盒8段 低孔特低渗 成岩作用 

分 类 号：TE132.1[石油与天然气工程—油气勘探]