论文部分内容阅读
柴达木盆地新生代时期气候较干燥,主要沉积棕色、浅灰色陆相碎屑岩。通过岩心观察,对路乐河组岩性、结构构造特征、暴露标志进行了分析,并结合测井曲线分析认为,本区路乐河组主要为一套发育于干旱—半干旱环境的末端扇沉积体系,可进一步划分为主流带、分流带和远端盆地带3个亚相,其中分流带亚相又可划分为分流河道沉积、泛滥平原沉积、越岸沉积和漫流沉积等4个微相。文中分析了各亚相平面展布特征,建立了沉积相模式。通过分析各亚相砂体的特征及其与储层发育的关系,认为分流带亚相是最有利的储层发育相带。
The climate in the Qaidam Basin was drier during the Cenozoic, mainly consisting of brown and light-gray continental clastic rocks. Through the observation of the core, the lithology, structural tectonic characteristics and exposure signs of the Lulehe Formation are analyzed. According to the analysis of well logging curves, the Lulehe Formation in this area is mainly composed of a set of end fan developed in arid and semi-arid environment Sedimentary systems can be further divided into three subfacies in the mainstream zone, the distributary zone and the remote basin. The distributary belt subfacies can be divided into four microfacies: distributary channel sedimentation, flood plain sedimentation, overbank sedimentation and flood sedimentation . In this paper, the distribution characteristics of each subfacies are analyzed and the sedimentary facies model is established. By analyzing the characteristics of sub-facies sand bodies and their relationship with reservoir development, it is considered that the distributary belt subfacies is the most favorable reservoir development facies belt.