城壕油田西259井区长3特低渗透储层特征及综合评价  

Formation Characteristics and Evaluation of Extra Low-Permeability in X259 Area of Chenghao Oilfield

作　　者：杨慧[1] 丁丽可[1] 莫建武[1,2] 梅丽 

机构地区：[1]中国石化中原油田分公司第五采油厂,河南濮阳457001 [2]大陆动力学国家重点实验室(西北大学),陕西西安710069 [3]河南中原绿能高科有限责任公司,河南濮阳457001

出　　处：《石油钻探技术》2010年第4期112-117,共6页Petroleum Drilling Techniques

基　　金：国家科技支撑计划"低(超低)渗透油田高效增产改造和提高采收率技术与产业化示范"(编号:2007BAB17B02)资助

摘　　要：利用测井资料、铸体薄片、扫描电镜、X-衍射、粒度分析和压汞等化验分析资料,综合分析了城壕油田西259区块长3特低渗透储层的岩石学特征、微观孔隙结构特征及它们的影响因素,评价了该储层的储集性能。长3油藏的储层物性总体较差,粒间孔、溶蚀孔、晶间孔等孔隙发育,孔隙结构属小孔隙、微细喉道类型。长3油藏的特低渗透特征受沉积作用和成岩作用的共同影响,沉积微相控制着储层特征,水下分流河道和河口坝明显好于水下分流间湾,而且成分成熟度低和粒度偏细也是造成特低渗的主要因素之一;同时成岩压实、胶结作用使储层的孔隙度、渗透性进一步减小、变差,而溶蚀作用和成岩缝的产生又在很大程度上改善了储层的特低渗透特征。将长3油藏储集岩分为3类进行了综合评价,认为水下分流河道与河口坝砂体是主要储层分布相带。In order to understand the formation characteristics and their impacts in order to evaluate the formation comprehensively,the rock characteristics and micro pore structure and its impacts were analyzed using logging data and information from thin section,electron microscope scanning,X-diffraction,grain size distribution analysis and mercury penetration etc.The formation was evaluated.The results show that formation properties are poor with developed intergranular pores,vug and intercrystal pore;the pore structure belongs to fine type with microscopic throat.Low permeability is caused by sedimentation and diagenesis with sedimentary microfacies determining the formation characteristics.The immature development and fine grain are also the reasons to cause the low permeability.In addition,compaction and cementation caused deduction of porosity and make permeability even worse,while erosion and diagenetic fractures improved permeability.The reservoir is classified into 3 classes for evaluation.Subsea river channel and river mouth sand are the main distributed facies belt.

关 键 词：储集层特征 地层评价 成岩作用 储集层 城壕油田 

分 类 号：TE348[石油与天然气工程—油气田开发工程]