摘 要摘 要柴达木盆地阿尔金山前东段，属于中国最大的基岩气藏。东坪地区 2018 年底提交基岩风化壳气藏储量 519.41×108m3。基岩勘探潜力大，是油气勘探的一个重要领域。柴达木盆地阿尔金山前东段主要发育岩浆岩类和变质岩类两类，岩浆岩主要为花岗岩、辉长岩和辉绿岩，变质岩主要为片麻岩、片岩、板岩和少量碎裂岩；储集空间主要有基质微孔、裂缝和溶蚀孔洞三类，其中微孔和溶洞是稳产的重要因素裂缝既是良好的运移通道又是最重要的储集空间,基岩储层控制因素主要有岩石类型、构造运动、成岩作用三大类，其中岩石类型是根本因素，原岩控制着原生孔隙和次生孔隙的发育，构造运动是最为主要的影响因素，控制裂缝的生成，优质储层都分布在断裂发育、距离不整合面较近的基岩构造高部位上；成岩作用包括碎裂作用溶蚀作用、充填作用、风化作用，其中碎裂作用、溶蚀作用、风化作用对储层有建设性作用，充填作用既有建设性也有破坏性的作用，以风化作用为主因形成的基岩风化壳油气藏，是东坪基岩油气藏的主要类型。因此，开展对于阿尔金山前东段基岩岩石学特征研究，为之后柴达木盆地基岩储层勘探提供理论指导和技术支持，这对盆地基岩油气勘探有着重要的意义。关键词：柴达木盆地；花岗岩；基岩储层；岩石学特征- I -ABSTRACTStudy on Petrological Characteristics of Granite Basement in The Eastern Part of The Altun MountainsABSTRACTThe former eastern section of the Altun Mountains in the Qaidam Basin is the largest bedrock gas reservoir in China. At the end of 2018, the Dongping area submitted the reserves of bedrock weathering crust gas reservoirs at 519.41×108 m3. The exploration potential of bedrock is large and is an important area for oil and gas exploration. The eastern part of the Altun Mountains in the Qaidam Basin mainly develops magmatic rocks and metamorphic rocks. The magmatic rocks are mainly granite, gabbro and diabase. The metamorphic rocks are mainly gneiss, schist, slate and a small amount of Cracked rock; reservoir space mainly includes matrix micropores, cracks and dissolved pores. Micropores and karst caves are ...
