子长油田余家坪王家湾区储层评价

发布时间：2018-04-05 16:18

本文选题：鄂尔多斯盆地　切入点：长2油层组　出处：《西安石油大学》2015年硕士论文

【摘要】：子长油田余家坪王家湾区位于陕西省子长县内,构造位置处于鄂尔多斯盆地东部的陕北斜坡,长2油层组是本区主力产油层。依据“旋回对比、分级控制”的原则,利用自然伽马测井曲线的细微显示,结合等时的概念,将长2油层组划分为长21-1、长21-2、长21-3油层小层和长22油层亚组。并在地层对比的基础上,建立了全区统一的地层构造格架。王家湾区长21油层总体构造格架为一平缓的西倾单斜,局部地区有鼻状突起及小高点存在。根据该区域沉积背景、砂体平面展布形态、岩性及电性特征、测井曲线等分析确定,子长王家湾区长2油层组属于三角洲平原水上主河道沉积。通过沉积微相平面展布图及沉积相剖面图等进一步分析了长21油层亚组长21-1、长21-2、长21-3各小层及长22油层亚组的沉积微相类型及展布特征。岩心观察、室内岩石薄片镜下鉴定、分析测定等表明子长油田王家湾区长2油层组储层砂岩主要是长石砂岩,含少量的岩屑长石砂岩,孔隙类型以粒间孔隙为主,其次为溶蚀孔隙。长2油层组储层物性较差,为一套低孔-低渗到特低孔-特低渗储层。通过储层的岩性、物性、渗流特征等方面的分析,对储层进行了评价,王家湾区长2油层段储层以II、III类储层为主,其次为IV类和I类储层。应用取心标定测井,建立了储层属性参数的测井解释数学模型,并依此对该区域内的井进行了测井资料二次数字处理,实现了非取心井储层参数的定量求取,为建立储层地质模型提供了井点处的储层参数确定值。根据取心井的分析化验资料,结合生产实用性,通过渗透率划分流动单元,将本区长2储层流动单元划分为A、B、C、D四种类型,C类流动单元为质量差的储层,但是为本区主力流动单元。
[Abstract]:The Yujiaping Wangjiawan area of Zichang Oilfield is located in Zichang County, Shaanxi Province. The structural position is located on the northern Shaanxi slope in the eastern part of Ordos Basin. Chang 2 reservoir formation is the main oil producing layer in this area.According to the principle of "cycle contrast, grading control", using the subtle display of natural gamma logging curve and the concept of isochronous, the Chang 2 oil formation is divided into Chang21-1, Chang21-2, Chang21-3 and Chang22 oil layers.On the basis of stratigraphic correlation, a unified stratigraphic framework is established.The overall tectonic framework of Chang21 reservoir in Wangjiawan area is a gentle westward slope with nasal protrusions and small high points in some areas.According to the sedimentary background of the area, the distribution of sand body, lithology and electrical characteristics, logging curves, etc., it is determined that the Chang 2 oil formation in the Wangjiawan area of Zichang belongs to the main channel deposition on the delta plain.The sedimentary microfacies types and distribution characteristics of the sub-formation 21-1, Chang 21-2, Chang 21-3 and Chang22 oil layer subgroup of Chang21 oil reservoir are further analyzed by using the sedimentary microfacies plane distribution map and sedimentary facies profile.The results of core observation, microscopic identification and analysis and determination indicate that the reservoir sandstone of Chang 2 reservoir in Wangjiawan area of Zichang Oilfield is mainly feldspathic sandstone, which contains a small amount of lithic feldspathic sandstone, and the pore type is mainly intergranular pore.The second is the dissolution pore.The reservoir physical property of Chang 2 reservoir is poor, which is a set of reservoirs with low porosity and low permeability to very low porosity and very low permeability.Through the analysis of lithology, physical properties and percolation characteristics, the reservoir is evaluated. The reservoir of Chang2 reservoir in Wangjiawan district is mainly IIPIII reservoir, followed by IV and I reservoirs.By using coring calibration logging, the logging interpretation mathematical model of reservoir attribute parameters is established, and the logging data in this area are processed twice and the reservoir parameters of non-coring wells are obtained quantitatively.The reservoir parameters at well point are provided for the establishment of reservoir geological model.According to the analysis and test data of coring wells and production practicability, the flow units of Chang 2 reservoir in this area are divided into four types of flow units, namely, Agna Bu C type C flow units, which are of poor quality through permeability division.But it is the main flow unit in this area.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

【相似文献】