靖安油田大路沟区长6油层组储层成岩作用与成岩相

靖安油田大路沟区长6油层组储层主要为湖泊三角洲前缘水下分流河道沉积,岩性主要为长石细砂岩、中—细砂岩.根据大量的铸体薄片、X衍射、扫描电镜、镜质体反射率等分析资料,研究了大路沟区长6储层砂岩的成岩作用类型、成岩阶段及成岩演化序列,分析了各种成岩作用对储层物性的影响.在成岩作用研究的基础上,划分出了绿泥石-浊沸石胶结相、绿泥石-方解石胶结相、方解石胶结相、泥质胶结相及浊沸石-长石溶蚀相等5种成岩相类型,其中以浊沸石-长石溶蚀相砂体物性最好.依据所建立的主要成岩相类型与测井曲线的对应关系,研究了各小层砂体的浊沸石-长石溶蚀相分布范围.

Diagenesis and diagenetic facies of the Upper Triassic Chang-6 reservoir in Dalugou area,Jing'an Oilfield

The Upper Triassic Chang-6 reservoir in Dalugou area,Jing'an Oilfield is mainly composed of the subaqueous distributary channel sandbody of lacustrine delta front.The rocks of Chang-6 reservoir are typically fine arkose,medium--fine sandstone.The diagenesis types,diagenesis stage and diagenesis evolution sequence of the Chang-6 reservoir sandstones,and the effects of various diagenesis types on the properties of the reservoir are studied based on a lot of the analysis data of cores,cast thin-section,X-ray diffraction(XRD),Scanning Electron Microscopy(SEM)and vitrinite reflectivity.Based on these studied,the reservoir sandstones can be classified into 5 diagenetic facies,i.e.chlorite--laumontite cementation facies,chlorite--calcite cementation facies,calcite cementation facies,argillaceous cementation facies,and laumontite--feldspar resolution facies,of which the laumontite--feldspar resolution facies sand-body has the best physical properties.The distribution of the laumontite--feldspar resolution facies in different thin sandbodies are studied based on the responding relationships between the main diagenetic facies and logging curves.