安塞地区长9致密砂岩储集层成岩作用研究  

Diagenesis in Tight Sandstone Reservoir of the Chang-9 Interval in Ansai Area in Ordos Basin

作　　者：白玉彬[1] 孙怀智 郝孝荣[3] 陈栋[3] 刘鹏 

机构地区：[1]安石油大学地球科学与工程学院,西安710065 [2]中国石油大庆油田有限责任公司地球物理物探一公司,黑龙江大庆163354 [3]延长油田股份有限公司,陕西延安716000 [4]中国石油集团测井有限公司技术中心,西安710018

出　　处：《新疆石油地质》2014年第1期23-28,共6页Xinjiang Petroleum Geology

基　　金：陕西省教育厅专项科研计划项目(12JK0491);陕西省自然科学基础研究计划资助项目(2013JM5007);中国石油科技创新基金项目(2011D-5006-0103)

摘　　要：根据砂岩薄片、铸体薄片、阴极发光、扫描电镜、黏土矿物X衍射等分析测试资料,对鄂尔多斯盆地安塞地区延长组长9致密砂岩储集层成岩作用进行了研究。结果表明,长9砂岩储集层主要经历了压实、胶结和溶蚀等多种成岩作用,其中压实和胶结作用为减少储集层孔隙的主要因素,溶蚀作用是增加储集层孔隙的主要因素,微裂缝一定程度上提高了储集层的渗透性,增强了流体渗流能力。长9砂岩储集层主要处于中成岩作用阶段A期,储集层孔隙演化与成岩作用关系密切,压实作用损失的孔隙度为15.64%,胶结作用损失孔隙度为11.32%,溶蚀作用和微裂缝增加孔隙度为4.04%,最终研究区计算孔隙度定格为7.48%,与实测平均孔隙度值7.20%比较一致。长9储集层有利成岩相带为长石溶蚀相和绿泥石膜-长石溶蚀相,发育于水下分流河道沉积微相中,最不利成岩相为碳酸盐胶结相和强压实相。According to the analysis and testing data from sandstone thin-section,cast thin-sections,cathodoluminescence,scanning electron microscope,X-ray diffraction,the diagenesis of Chang-9 tight sandstone reservoir in Ansai area in Ordos basin is studied.The results show that Chang-9 sandstone reservoir went mainly through compaction,cementation and dissolution,of which the compaction and cementation are the main factors for reducing reservoir porosity,the dissolution is the main factor for increasing reservoir porosity,while the microfractures serve as improving the reservoir permeability and increasing the fluid percolation ability in a certain extent.The Chang-9 sandstone reservoir＇ s diagenesis belongs to the ＂A＂ phase of medium diagenesis,with close relations between porosity evolution and diagenesis.The compaction made the porosity loss of 15.64％,the cementation made the porosity loss of 11.32％,the dissolution and micro-fractures increased porosity of 4.04％,hence the calculated porosity in the study area is determined as 7.48％,which is relatively consistent with the average value of the measured porosity of 7.20％.The favorable diagenetic facies of Chang-9 reservoir is the feldspar corrosion facies and the chlorite film-feldspar corrosion facies developed in the underwater distributary channel sedimentary microfacies,and the most unfavorable diagenetic facies are the carbonate cementation facies and the strong compaction facies.

关 键 词：鄂尔多斯盆地 安塞地区 延长组储集层 致密砂岩 成岩作用 成岩相 

分 类 号：TE122.21[石油与天然气工程—油气勘探]