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1、鄂尔多斯盆地某矿区储层特征及潜在损害因素评价吕岑1郑志乐2李梦茹1杨易卓1(1长江大学,资源与环境学院,湖北武汉,430100;2中海油深圳实验中心,广东深圳,518067)摘要:采用X-射线衍射、压汞实验、岩心常规物性分析等实验方法,对鄂尔多斯盆地某矿区煤层气储层特征进行了研究,并在此基础上,采用敏感性评价实验对煤储层潜在损害因素进行了研究。结果表明,目标矿区内煤储层主要成分为炭,其次含有黏土矿物、黄铁矿、方解石和少量石英;其中黏土矿物主要以蒙脱石、高岭石和绿泥石为主;储层平均孔隙度为4.83%,储层渗透率主要分布在1.5mD~3.5mD之间,物性
2、较差。敏感性实验结果表明,目标矿区内煤储层存在较强的应力敏感性,速敏和水敏损害程度均为强,碱敏损害程度为中等偏弱,酸敏损害程度为中等偏强。根据以上储层特征及潜在损害因素评价结果,有针对性的提出适合目标矿区的储层保护措施建议,以期为鄂尔多斯盆地煤层气的高效开发提供保障。关键词:鄂尔多斯盆地,储层特征,潜在损害因素;敏感性,储层保护EvaluationofreservoircharacteristicsandpotentialdamagefactorsinaminingareaofOrdosBasinLVCen1ZHENGLe-zhi2LIMeng-ru
3、1YANGYi-zhuo1(1SchoolofResourcesandEnvironment,YangtzeUniversity,HubeiWuhan,430100,China;2CNOOCShenzhenExperimentalCenter,GuangdongShenzhen,518067,China)Abstract:ThecharacteristicsofcoalbedgasreservoirinaminingareainOrdosBasinwerestudiedbyX-raydiffraction,mercurypressuretestand
4、coreconventionalphysicalpropertyanalysis.Onthisbasis,thepotentialdamagefactorsofcoalreservoirwerestudiedbysensitivityevaluationexperiment.Theresultsshowthatthemaincomponentofthecoalreservoirinthetargetminingareaiscarbon,followedbyclayminerals,pyrite,calciteandasmallamountofquar
5、tz,andtheclaymineralsaremainlymontmorillonite,kaoliniteandchlorite;theaverageporosityofthereservoiris4.83%,andthereservoirpermeabilityismainlydistributedamong1.5mD~3.5mD,andthephysicalpropertyispoor.Theresultsofsensitivitytestshowthatthecoalreservoirinthetargetminingareahasstro
6、ngstresssensitivity,thespeedsensitivityandwatersensitivityareallstrong,thedegreeofalkalisensitivedamageismediumweak,andthedegreeofacidsensitivedamageismoderate.Accordingtotheevaluationresultsofreservoircharacteristicsandpotentialdamagefactors,thesuggestionofreservoirprotectionm
7、easuressuitableforthetargetminingareaisproposedinordertoprovideaguaranteefortheefficientdevelopmentofcoalbedgasinOrdosBasin.Keywords:OrdosBasin,reservoircharacteristics,potentialdamagefactors,sensitivity,reservoirprotection煤层气属于一种非常规天然气,其主要成分为甲烷,还含有少量的二氧化硫、一氧化碳和二氧化碳等气体,煤层气的勘探开发
8、成为接替煤炭和石油天然气等常规资源最有前景的途径之一。煤储层作为煤层气的气源岩和储集层,相比较于常规油气储层