【作者】 李斌；

【导师】 张春生；

【作者基本信息】 长江大学 ， 矿产普查与勘探， 2013， 硕士

【摘要】 镇原油田镇250区以延10油藏为代表的侏罗系油藏属于物性较好的河流相储层,但横向变化快,储存的非均质性较强。该区自2009年正式投入开发,主力油层为延102小层,由于开发时间较短,对侏罗系油藏缺少大范围精确的研究,并且目前开发过程中已逐渐暴露出一些问题,因此急需对镇250区延10油藏进行系统的研究与认识,开展精细开发技术政策研究,为后续油田开发调整,提高油藏最终采收率具有相当重要的作用。本文以鄂尔多斯盆地镇原油田镇250区侏罗系延安组延10油藏为研究对象,综合应用油田地质、钻井、测井、试井、开发生产等多种渠道获得的镇250区地质资料、测井资料、岩心分析资料、生产动态资料、地层测试资料以及相邻区块的精细描述成果,以开发地质学、地质统计学、现代油藏工程理论、油气藏数值模拟技术为指导,在综合研究与精心设计的前提下完成各项研究工作。在一次精细油藏描述的基础上,进行地层划分和对比。参考区域沉积背景,通过建立标准微相柱状图、测井相模式和单井相等开展沉积微相研究。结合测井二次精细解释成果,分析储层的宏观分布规律,研究储层非均质性与沉积微相展布对油水分布状况控制情况。最后建立一个描述构造、储层、流体空间分布的静态三维地质模型,定量表征镇250区延10油藏三维空间的分布特征,为目标油藏数值模拟和油藏工程研究奠定坚实的基础。主要取得了以下研究成果：1.通过地层的精细划分对比,按照“旋回对比,分级控制”的原则,在标志层控制下通过岩性、电性、沉积旋回,结合等高程和厚度对全区进行反复对比研究,建立了8条骨架对比剖面,完成了对全区的统一闭合,将主要目的层段延10划分为延101、延102、延103三个小层。从全区砂体剖面对比图中可以看出地层厚度在全区相对稳定,变化比较小,层位比较稳定,标志层电性特征明显,延102、延103平均厚度稍大,延101平均厚度稍小,主要与区内沉积环境有关。利用井点数据并结合地质趋势通过井间克里金插值建立了本区的构造模型；2根据岩心,测井曲线等特征,参考区域沉积背景及前人研究可以判断工区延10期物源方向主要来自北东向,研究区属于河流相沉积,可细分为河道沉积、河道侧缘和泛滥平原三种沉积微相,其主河道微相为主要储集砂体。对8口井进行了单井相分析,4条剖面的相剖面分析,并通过与砂体的平面展布特征对比确定了区内沉积微相的展布情况；3.延10储层为细-中粒长石岩屑砂岩,储层物性整体上具有低孔、中渗的特点。研究了储层的非均质性特征,层内非均质性包括垂向粒度分布韵律性、层内夹层、层内渗透率非均质程度,认为延102的层内非均质性较弱,延101、延103为中等层内非均质；层间非均质性主要包括储层纵向分布程度、层间渗透率非均质性、层间隔层分布特征等,认为延101具有强的非均质性,延102、延103为中等-强非均质性；平面非均质性主要分析了砂体的连续性、砂体的连通性以及储层物性的平面变化,分别研究了延101、延102、延103三个沉积时期孔隙度和渗透率的平面变化特征。4.镇250区的储层地质模型是在综合运用地质、测井等资料的基础上,通过petrel软件用基于象元的序贯指示模拟方法对沉积微相、岩相进行模拟,利用相控技术对物性参数采用序贯高斯模拟的方法进行模拟,建立了要求范围内的定量三维地质模型,并对沉积微相和物性参数模型进行评价和优选。最后通过模拟参数与原始输入数据进行对比、岩相模型与孔隙度模型的切片对比、模型与手工绘制平面展布对比、储量拟合等方法进行建模结果分析。更多还原

【Abstract】 The Jurassic reservoir in Zhen250district of Zhenyuan Oilfiedl, represented by Yan10oil formation, belongs to fluvial facies reservoir with good physical properties but rapid lateral variation and strong reservoir heterogeneity. Zhen250district has been put into exploitation since2009, of which the major reservoir layer is Yan102sublayer, however, due to its short history of exploitation, the study of Jurassic reservoir is not enough. Moreover, some problems have emerged during the process of exploitation. Therefore, it is urgent to carry out a systematic study and recognition of the Yan10oil formation in Zhen250District and of the policies in fine exploitation technologies, and this is very important for later exploitation regulation of the oilfield and the development of ultimate recovery ratio.The present study takes the Yan10oil formation of the Jurassic reservoir in Zhen250District of Zhenyuan Oilfield, Ordos Basin as its subject, obtained geological information,well log information,core analysis infoamation,production performance information,formation test information and result of fine description by comprehensively applying oil field geology,well drilling,well log,reservoir test,exploit production and a variety of channels.Using development geology,geostatistics,modem reservoir engineering theory,oil and gas accumulation numerical simulation as a guide, accomplished all the research work by the prerequisite of comprehensive research and well-designed.On the basis of a fine reservoir description, stratigraphic classifications and comparisons will be made. With reference the regional sedimentary background, sedimentary microfacies research will be studied through establishing standard microfacies bar chart, electrofacies, single well facies, etc. Based on the interpretation of the results of the second fine logging, the macro distribution of the reservoir will be analyzed, and the influence of the reservoir heterogeneity and the distribution of sedimentary microfacies on the distribution of oil will be studied.Finally a static three-dimensional geological model describing the structure, reservoir and the spatial distribution of fluid will be builted, and it will quantitatively present the characteristics of the distribution of the Yan10reservoir at a three-dimensional level in Zhen250District, and also, it will lay a very good foundation for designation oil formation numerical simulation and later studies of reservoir engineering. The major findings achieved in the present study are as follows.1. Based on the fine stratigraphic classification and comparison, and according to the principle of "cyclic correlation and step control",, By repeating comparative study of the region through the lithologic character,electric property,cycle of sedimentation and united identical elevation and thickness under the control of marker bed, establish eight skeleton correlation profile and so accomplish united closure of the whole district. The major layer of Yan10is divided into three sublayers, i.e. Yan101, Yan102, Yan103. From chart of the cross-sectional comparison of the sand body in this region, we can see that the stratigraphic thickness in the region is relatively stable and it varies at a small level, and the stratigraphic position is also stable, and the electrical properties shown in the marker bed are distinct. The average thickness of Yan102and Yan103is a little thick, and that of the Yan101is a little thin, and this is related to the sedimentary environment in this region. On the basis of the well point data and the geological trend, the present study has built a tectonic model through cross-hole kriging interpolation.2. Based on the characteristics of core and log curve, and by referring to the regional sedimentary background and previous studies, we can determine that in this area the sediments during Yan10are mainly from the northeast, and the study area belongs to fluvial facies sedimentation, which can be subdivided into three kinds of sedimentary microfacies, i.e. channel deposit,channel lateral margin and flood plain, with the microfacies of channel as the main reservoir sand body. Sing well facies analysis was conducted to eight wells, and profile analysis was conducted to four sections, and by comparing results of those analyses with the characteristics of plane distribution of sand body, we can determine the distribution of sedimentary microfacies in this area.3. Reservoir of Yan10is chondro-mesograin feldspar lithic sandstone with low porosity and medium permeability for the whole.The heterogeneity of the reservoir was studied from three aspects:in-layer heterogeneity, interlayer heterogeneity and plane heterogeneity.In-layer heterogeneity concerns the distribution rhythmicity of vertical grain size,intraformational bed and degree of permeability heterogeneity,we can conclude that Yan102has weak in-layer heterogeneity,but Yan101and Yan103have medium in-layer heterogeneity;Interlayer heterogeneity mainly include the longitudinal distribution of the reservoir, the heterogeneity of interlamination permeability, and characteristics of the distribution of barrier bed between layers, etc,concluding that Yan101has strong heterogeneity,Yan102and Yan103have medium-strong heterogeneity. Plane heterogeneity is mainly concerned with the continuity and the connectivity of sand body, and the variation of the physical properties on the plane of the reservoir, to be specific, the present research has studied the characteristics of the variation in the reservoir’s porosity and permeability on the plane during three sedimentary periods i.e. Yan101, Yan102, Yan103.4. The geological model of the reservoir in Zhen250district was built on the basis of the materials in geology and logging and by using the pixel-based Sequential Indicator Simulation in the software of Petrel to simulate sedimentary microfacies and lithofacies, and also by using Sequential Gauss Simulation in the technology of facies-control to simulate the physical parameters. And the model established in the present study is a quantitative3-dimensional geological model. Also, an evaluation of different models was made in order to select an optimal model of sedimentary microfacies and also an optimal model of physical parameters. Finally through the comparison between simulation parameters and the original input data, the comparison between the lithofacies model and the section of porosity model, the comparison between the geological model of the reservoir and the manual plotting of the plane distribution, and reserve fitting, etc. the results gained from the geological model of the reservoir built in the present study were analysed.更多还原