鄂尔多斯盆地姬嫄地区长6段超低渗储层敏感性评价  

Sensitivity evaluation on ultra-low permeability reservoir of Chang 6 Members in Jiyuan area,Ordos Basin

作　　者：李旭 安小平[3] 谭习群[3] 闫冠宇[1] 何望雪 LI Xu;AN Xiaoping;TAN Xiqun;YAN Guanyu;HE Wangxue(School of Earth Sciences and Engineering,Xi'an Shiyou University,Xi'an 710065,Shaanxi,China;Key Laboratory of Hydrocarbon Accumulation Geology in Shaanxi Province,Xi'an Petroleum University,Xi'an 710065,Shaanxi,China;Exploration and Development Research Institute of Changqing Oilfield Company,Xi'an 710018,Shaanxi,China)

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]西安石油大学陕西省油气成藏地质学重点实验室,陕西西安710065 [3]长庆油田分公司勘探开发研究院,陕西西安710018

出　　处：《矿产勘查》2020年第11期2448-2454,共7页Mineral Exploration

基　　金：国家自然科学基金项目(编号:41702132);陕西省自然科学基础研究计划项目(编号:2019JM-055)联合资助。

摘　　要：以鄂尔多斯盆地姬嫄地区长6段油层组超低渗储层作为研究对象,在储层岩石学、孔隙结构、储层物性特征等基础上,结合储层"五敏"实验详实数据,解释该地区超低渗储层敏感性及敏感机制。姬嫄地区长6段超低渗储层所展现的敏感性为弱速敏、中等偏弱水敏、中等偏弱盐敏、无酸敏到弱酸敏、弱碱敏、强压敏;且速敏中的临界流速、盐敏中的临界矿化度、酸敏中的临界p H值分别为1.0mL/min、10000mg/L、8.5。储层敏感程度主要受矿物成分和孔隙结构的影响,储层速敏的形成源于其孔隙填隙物-高岭石的存在;绿/蒙混层及伊/蒙混层矿物是引起水敏及盐敏的主要因素;铁白云石及含铁绿泥石等酸敏矿物的存在使部分岩样显弱酸敏;非常杂乱的孔喉结构、受到压力特别容易变形的片状喉道以及岩样中所含的云母、黏土等一些塑性矿物导致储层具强压敏性。储层敏感性评价的意义在于防止储层伤害、保护好储层,可以有效地发挥储层的产能,已达到科学的开采油田的目的。Based on petrology,pore structure and physical characteristics of reservoirs,the paper explains the sensitivity and mechanism of ultra-low permeability reservoirs in Chang 6 Members in Jiyuan area,Ordos basin.The results show that the sensitivity of ultra-low permeability reservoirs in Chang 6 Members in Jiyuan area is weak velocity sensitivity,medium to weak water sensitivity,medium to weak salt sensitivity,no acid sensitivity,weak acid sensitivity,weak alkali sensitivity and strong pressure sensitivity.In addition,the critical velocity in velocity sensitivity,critical salinity in salt sensitivity,and critical p H value in acid sensitivity were respectively 1.0 ml/min,10000 mg/L,and 8.5.Reservoir sensitivity is mainly affected by mineral composition and pore structure.Formation of reservoir velocity sensitivity is caused by the presence of pore interstitial material-kaolinite.chlorite/montmorillonite interstratified mineral and illite/montmorillonite interstratified minerals are the main factors causing water and salt sensitivity.The presence of acidsensitive minerals such as ferric dolomite and ferric chlorite makes some samples weak acid-sensitive.The very disorderly pore throat structure,flaky throat that is easily deformed under pressure,and some plastic minerals such as mica and clay in rock samples lead to the strong pressure sensitivity of reservoirs.The significance of reservoir sensitivity evaluation lies in preventing reservoir damage and protecting reservoir,which can give full play to reservoir productivity effectively and reach the goal of scientific exploitation of oil field.

关 键 词：油层组 超低渗储层 敏感性 长6段 姬嫄地区 鄂尔多斯盆地 

分 类 号：TE371[石油与天然气工程—油气田开发工程]