直罗探区延长组长2低渗储层特征及有利区预测

发布时间：2018-05-09 14:02

  本文选题：直罗油田 + 延长组　； 参考：《西安石油大学》2017年硕士论文

【摘要】：直罗油田直罗探区位于陕西省富县境内,研究区面积1168.7km~2,构造位置属于鄂尔多斯盆地陕北斜坡东南部。目前该区已开发的长2开发区块,勘探开发程度不均匀,且已进入高含水时期,生产矛盾日益突出,自然递减达20%以上。为了保证该区油田的稳产增产,找出已开发区块外的长2层有利区,迫在眉睫。本文运用沉积学、层序地层学、石油地质学、储层地质学、地球物理学,地球化学等理论对该区进行整体地质认识,在区域认识的基础上,从沉积相和砂体展布研究入手,着重分析主力目的层的构造、储层特征及油气成藏控制因素,生储盖的配置关系,从而弄清研究区油气富集地质条件,预测有利油藏分布区,为油田勘探开发提供目标。研究区长2地层构造平缓,在西倾单斜背景下发育的近东西向低缓鼻状隆起;长2沉积期,研究区主要发育三角洲前缘亚相;由岩心观察、铸体薄片、扫描电镜分析,储层的岩石类型主要为细粒岩屑长石砂岩和长石砂岩,分选较好,次棱角状磨圆,孔隙类型以残余粒间孔为主,储层物性较差,属于低、特低孔-超低渗储层;铸体薄片、扫描电镜、X衍射等微观实验结果表明,研究区长2储层成岩作用类型主要为机械压实作用、胶结作用、交代作用和溶蚀作用,且储层砂岩已进入中成岩阶段A期。三角洲前缘水下分流河道砂体是主要的储集砂岩,在沉积作用的基础上,各种成岩作用对储层砂岩的物性起着建设或破坏性的影响,使储层性能复杂化。结合各类测试资料及研究分析,得出烃源岩分布、沉积作用、储层物性、构造作用、是控制含油性的主要因素,综合该区含油性控制因素和试油资料,对主力层长2~1、长2~2进行了有利区筛选,预测Ⅱ类勘探目标有利区3个,Ⅲ类勘探目标有利区4个,为研究区后续勘探开发工作提供了可靠的地质依据。
[Abstract]:The Zhiluo exploration area of Zhiluo Oilfield is located in the rich county of Shaanxi Province with an area of 1168.7 km2 and the structural position belongs to the southeastern slope of northern Shaanxi in the Ordos Basin. At present, the exploration and development degree of Chang2 development block in this area is not even, and it has entered into high water cut period, the production contradiction is more and more prominent, the natural decline is more than 20%. In order to ensure stable production and increase production in this area, it is urgent to find the favorable area of 2 layers outside the developed block. Based on the theories of sedimentology, sequence stratigraphy, petroleum geology, reservoir geology, geophysics, geochemistry, and so on, this paper studies the distribution of sedimentary facies and sand bodies on the basis of regional understanding. The structure of the main target layer, reservoir characteristics, controlling factors of oil and gas accumulation, and the distribution of source, reservoir and cap are analyzed in order to make clear the geological conditions of oil and gas enrichment in the study area, to predict the favorable reservoir distribution area, and to provide the target for oil field exploration and development. The Chang-2 stratigraphic structure in the study area is flat, the near east-west low slow nose uplift developed in the background of the westward inclination monoclinal, the delta front subfacies mainly developed in the Chang 2 sedimentary period, the core observation, the casting thin section, the scanning electron microscope analysis, The rock types of reservoir are mainly fine lithic feldspathic sandstone and feldspar sandstone with good sorting, sub-angle-shaped grinding circle, pore type of residual intergranular pore, poor physical property of reservoir, ultra-low porosity and ultra-low permeability reservoir; The results of SEM and XRD show that the diagenesis types of Chang 2 reservoir are mainly mechanical compaction, cementation, metasomatism and dissolution, and the sandstone has entered stage A of middle diagenesis. The delta front underwater distributary channel sand body is the main reservoir sandstone. On the basis of sedimentary process, various diagenesis has a construction or destructive effect on the physical properties of reservoir sandstone, which complicates the reservoir performance. Combined with all kinds of test data and research and analysis, it is concluded that hydrocarbon source rock distribution, sedimentation, reservoir physical property and tectonism are the main factors controlling oil bearing, and synthesizing the oil-bearing control factors and oil testing data in this area. In this paper, the favorable zones of the main formation are screened, and three favorable areas for class 鈪，

本文编号：1866300