CAJ | 학술논문

通过露头剖面、岩心观察和测量，分析了鄂尔多斯盆地南部中生界页岩中砂质纹层的发育特征，并利用扫描电子显微镜和XRD定量分析技术，分别观察分析了砂质纹层和纯页岩层的微观特征和岩石矿物学组分。在此基础上，为了分析砂质纹层对页岩储层物性影响，用脉冲衰减法对砂质纹层和纯页岩层的孔隙度和渗透率进行测试，结果表明，页岩中发育的砂质纹层增大了页岩孔隙度和水平渗透率：砂质纹层中含有石英、长石等碎屑颗粒，在成岩压实过程中形成的支撑结构有利于原生孔隙的保存，后期溶蚀作用也在一定程度上增加了页岩储层的孔隙度，这些碎屑颗粒也增加了整个页岩层系的脆性，有利于页岩后期的压裂；砂质纹层与页岩之间形成的层理面增大了页岩储层的水平渗透率。因此，页岩气的勘探部署和后期开发过程中要重视砂质纹层的研究。
통과로두부면、암심관찰화측량，분석료악이다사분지남부중생계혈암중사질문층적발육특정，병이용소묘전자현미경화XRD정량분석기술，분별관찰분석료사질문층화순혈암층적미관특정화암석광물학조분。재차기출상，위료분석사질문층대혈암저층물성영향，용맥충쇠감법대사질문층화순혈암층적공극도화삼투솔진행측시，결과표명，혈암중발육적사질문층증대료혈암공극도화수평삼투솔：사질문층중함유석영、장석등쇄설과립，재성암압실과정중형성적지탱결구유리우원생공극적보존，후기용식작용야재일정정도상증가료혈암저층적공극도，저사쇄설과립야증가료정개혈암층계적취성，유리우혈암후기적압렬；사질문층여혈암지간형성적층리면증대료혈암저층적수평삼투솔。인차，혈암기적감탐부서화후기개발과정중요중시사질문층적연구。
Through the observation and measurement of outcrops and cores,this paper analyzes the characteristics of sandy laminar of the upper triassic Yanchang Fm in southern Ordos basin,and using scanning electron microscope ( SEM)and X-Ray diffraction( XRD)to observe and analyze the rock mineral characteristics of sandy laminar and pure shale. In order to analyze the effect of sandy laminar on the shale reservoir property,this paper uses pulse de-cay method to test the porosity and permeability of the shale and sandy laminar. The results show that sandy laminar can increase the porosity and horizontal permeability of shale reservoir,clastic particles such as quartz and feldspar in sandy laminar can form a supporting structure which is favourite to preserve the primary pores,and paulopost dis-solution can increase the porosity of shale reservoir to some extent. These clastic particles can also increase the shale brittleness,which is benefit for shale fracturing. The bedding surface of the shale and sandy laminar increases the horizontal permeability of shale reservoir. So we should pay attention to the sandy laminar of the shale reservoir in the shale gas exploration and development process.