鄂尔多斯盆地杏北区长6储层特征及影响因素分析  

The influential factors and charactristics of Chang 6 formation reservior in Xingbei area,Ordos Basin

作　　者：朱玉双[1] 吴长辉[1,2] 王小军[2] 李莉[2] 邵飞[2] 刘渊[2] 

机构地区：[1]西北大学大陆动力学国家重点实验室/地质学系,陕西西安710069 [2]长庆油田公司第一采油厂,陕西延安716000

出　　处：《西北大学学报（自然科学版）》2010年第3期497-502,共6页Journal of Northwest University（Natural Science Edition）

基　　金：国家重点基础研究发展计划基金资助项目(2003CB214603)

摘　　要：目的对安塞油田杏北区长6储层特征及影响因素进行深入分析,为其科学有效开采提供依据。方法利用铸体薄片、扫描电镜、岩心和测井分析等各种资料进行综合分析。结果研究区储层岩性主要为细粒长石砂岩。储集空间以粒间孔为主,溶孔次之。孔隙结构以小孔微喉型和中—小孔微细喉型为主,进汞曲线平台不明显,呈陡斜式,储层孔隙结构微观非均质强。储层物性较差,微裂缝对改善储层渗透性贡献不明显,属低渗、特低渗油藏。结论储层特征受沉积作用和成岩作用综合影响,水下分流河道是形成有利储层的主要相带;研究区压实作用强烈,对储层物性影响较大;绿泥石胶结对储层孔隙的保存有建设性作用;浊沸石溶蚀强烈,其溶蚀孔隙是重要的储集空间,浊沸石溶蚀孔隙的发育程度已成为研究区寻找有利储层的重要指标。Aim To research the physical property and influence elements of Chang 6 Formation of Yanchang in Ansai Oil Field to suppling scientific and valid foundation of exploitation. Methods A synthesis analysis by using the cast slices,scanning electron microscope,porosity and permeability analysis,log interpretation,and mercury in-jection test. Results The research presents that the lithologic character of reservoir mainly includes fine arkose. The pore space of reservoir mainly includes the primary residual intergranular pores and emposieu. Fine pore-tiny throat and medium to fine pore-microscopic throat are the main pore configuration. Mercury intrusion method shows that micro heterogeneity of pore configuration is high. The role of the microfracture in improving the petrophysical property of reservoir and connectivity of pore throat of Chang 6 sandstone reservoir is very weak thus its belongs to low permeability and porosity oil reservoir. Conclusion The characteristics of reservoir are affected by deposition and diagenesis,and underwater distributary channel is the main favorable microfacie. The physical property was declined obviously for the intensive compaction in Xingbei area. Chlorite is the mainly clay mineral,which has constructive affect in keeping the pore space of reservoir. The composition of adelforsit is intense,whose composition pore is the important pore space for Chang 6 sandstone reservoir in Xingbei region. The development degree of emposieu is one of the important parameter in finding the beneficial reservoir.

关 键 词：鄂尔多斯盆地 杏北地区 长6储层 孔隙结构 沉积作用 成岩作用 

分 类 号：TE122.23[石油与天然气工程—油气勘探]