摘要
综合利用铸体薄片镜下观察、物性分析、扫描电镜及X-衍射等分析手段,对四川盆地北部地区须家河组的储层特征、沉积作用和成岩作用进行了研究。研究结果表明,研究区须家河组储层孔隙类型以粒间溶孔和粒内溶孔为主,平均孔隙度为3.25%,平均渗透率为0.05mD,为低孔-低渗型储层。三角洲前缘水下分流河道沉积微相是储层发育的最有利微相类型;压实作用是导致储层孔隙损失的首要因素;强烈的胶结作用导致孔隙进一步减少;溶蚀作用是对储层发育贡献最大的建设性成岩作用,溶蚀作用的强弱是储层发育的关键因素;裂缝是改善砂体储渗能力的重要因素。
The reservoir characteristics,sedimentation and diagenesis of Xujiahe Formation in northern Sichuan Basin are studied based on casting thin-section observation,petrophysical-property analysis,SEM and X-ray diffraction.Results show that in this reservoir:(1) the pore types mainly consist of intergranular dissolution pore and intragranular dissolution pore,with average porosity of 3.25% and average permeability of 0.05 mD,belonging to a low-porosity and low-permeability reservoir;(2) the most favorable microfacies developed is deltaic front underwater distributary channel;(3) compaction is the main factor affecting porosity reduction;(4) strong cementation can make pore further decrease;(5) dissolution is a kind of constructive diagenesis uppermost conducive to reservoir development and its strength is also the key impacting on reservoir development;and(6) fracture is also the dominant factor improving a reservoir-permeability capacity for sandbody.
出处
《天然气勘探与开发》
2012年第1期13-17,31,共6页
Natural Gas Exploration and Development
基金
国家重大专项"碎屑岩层系大中型油气田富集规律与勘探关键技术"项目(2008ZX05002-004)
