陕北斜坡南部长2油气分布主控因素研究

发布时间：2018-06-04 12:34

  本文选题：陕北斜坡 + 长2　； 参考：《西安石油大学》2015年硕士论文

【摘要】：鄂尔多斯盆地油气资源丰富,属于我国第二大含油气盆地,研究区位于鄂尔多斯盆地陕北斜坡南部,长2油层组为其主力产油层。为了进一步地研究该区油藏分布的主控因素,本文以沉积学与石油地质理论为指导,在收集大量地质、钻井、测井、试油等资料的基础上,结合区域地质背景,对研究区长2油层组地层划分与对比、构造特征、沉积微相及砂体展布、储层特征等内容综合研究,并利用残余厚度法恢复了研究区长1油层组顶部古地貌,分析其与油藏分布关系,最终总结出研究区油气分布的主控因素。研究表明,长2油层组可划分为长21、长22和长23三个油层亚组;长2油层组顶部构造总体表现为西倾单斜,发育近东西向的多排鼻状构造隆起;长2属于三角洲平原及三角洲前缘亚相沉积,相互叠置的分流河道及水下分流河道砂体是主要的储集体,岩性以细粒的长石砂岩和岩屑长石砂岩为主;结合研究区储层物性、储集空间的宏观特征、微观孔隙结构特征、毛管压力曲线特征以及储层厚度、岩性等,将长2储层划分为Ⅱ类储层;与邻区相比,长2油藏具有含水率较高的特点。综合分析认为,古地貌对长2油藏起到破坏性作用,但其相对高部位、砂顶构造中的鼻状隆起、河道厚砂体是油藏富集的主要控制因素,长1的区域性盖层以及长2油层组内部每个沉积旋回的顶部发育的泥岩、粉砂质泥岩是其良好的封盖条件。
[Abstract]:The Ordos Basin is rich in oil and gas resources and belongs to the second largest oil and gas bearing basin in China. The study area is located in the south of the northern slope of the Ordos Basin with Chang 2 reservoir as its main oil producing layer. In order to further study the main controlling factors of reservoir distribution in this area, based on the theory of sedimentology and petroleum geology, and on the basis of collecting a large amount of data of geology, drilling, logging and oil testing, this paper combines with the regional geological background. The stratigraphic division and correlation, structural characteristics, sedimentary microfacies and sandbody distribution, reservoir characteristics of Chang 2 oil formation in the study area are comprehensively studied, and the paleogeomorphology of the top of Chang 1 oil formation in study area is restored by residual thickness method. Finally, the main controlling factors of oil and gas distribution in the study area are summarized. The study shows that Chang2 oil formation can be divided into three subgroups of Chang21, Chang22 and Chang23, and the top structure of Chang2 oil formation is generally inclined to the west, with multiple rows of rhinoid uplift near east-west direction, the top structure of Chang 2 oil formation can be divided into three subgroups: Chang 21, Chang 22 and Chang 23. Chang 2 belongs to delta plain and delta front subfacies, the distributary channel and underwater distributary channel sand body are the main reservoir bodies, the lithology is mainly fine feldspar sandstone and lithic feldspathic sandstone. Chang 2 reservoir is divided into class 鈪，

本文编号：1977372