鄂尔多斯盆地安塞南部延安组下段沉积微相研究

发布时间：2019-02-12 23:59

【摘要】：鄂尔多斯盆地作为我国第二大沉积盆地,含有丰富的油气资源。本文综合安塞南部地区地质概况、岩心资料、测井资料等基础资料,对延安组下段延10、延9、延8三个油层组进行地层划分与对比,在此基础上进行了沉积微相分析与类型识别、沉积微相平面展布与砂体平面展布等研究,并在沉积微相研究的基础上,结合物性资料及试油资料等,预测了有利勘探区。通过标志层法、沉积旋回法、地层等厚法,对延10、延9、延8三个油层组进行了地层划分与对比,详细描述了各油层组的厚度、岩电特性,并通过多井剖面对比,分析了目的层在纵、横向上的发育变化特征。利用钻井岩心观察、测井资料,通过岩石学特征、岩性组合、沉积构造、古生物化石、测井相等相标志特征,作者认为延10油层组属于辫状河亚相沉积,发育河道砂坝微相,只在研究区南部局部地区发育泛滥平原微相;延9、延8油层组属于三角洲前缘亚相沉积,发育水下分流河道、水下分流间湾、前缘席状砂和河口坝微相。延10油层组受甘陕古河的影响,发育东西向展布的砂体,延9、延8油层组砂体相对较薄,均发育3条北东南西展布的水下分流河道砂体。研究区延10、延9、延8三个油层组的均发育鼻状构造,且位置和规模具有一定的继承性,主要分布在G17井-X6010井以及G22井-Q52井一带。研究区延安组下段主要为构造-岩性油气藏,沉积微相、鼻状构造为油气聚集的主控因素。分析认为研究区存在两种油气成藏模式,即斜坡区-河流相成藏模式和三角洲前缘成藏模式。结合各油层组砂体展布特征、孔渗特征、油层分布特征以及顶构造特征,对研究区延10、延9、延8三个油层组进行了有利区块预测,共选出了8个最有利的勘探区,为以后的勘探开发提供了依据。
[Abstract]:As the second largest sedimentary basin in China, Ordos Basin is rich in oil and gas resources. Based on the geological survey, core data, logging data and other basic data in the southern Ansai area, this paper makes stratigraphic division and correlation of Yan 10, Yan 9 and Yan 8 reservoirs in the lower member of Yan'an formation. On this basis, sedimentary microfacies analysis and type identification, sedimentary microfacies plane distribution and sand body plane distribution are studied. On the basis of sedimentary microfacies research, combined with physical property data and oil test data, favorable exploration areas are predicted. By means of marker layer method, sedimentary cycle method and formation equal thickness method, the stratigraphic division and correlation of Yan 10, Yan 9 and Yan 8 reservoirs are carried out, and the thickness and electrical characteristics of each reservoir group are described in detail, and the correlation of multi-well profile is carried out. The development and variation characteristics of the target layer in longitudinal and horizontal are analyzed. By using drilling core observation, logging data, petrological characteristics, lithologic assemblages, sedimentary structures, paleontological fossils, logging equivalent facies markers, the authors consider that the Yan10 oil formation belongs to braided river subfacies and develops channel bar microfacies. The flood plain microfacies were developed only in the southern part of the study area. Yan 9 and Yan 8 oil formations belong to delta front subfacies and develop subaqueous distributary channel, underwater distributary bay, front matte sand and estuarine bar microfacies. Affected by Ganshanguhe, the Yan 10 oil formation developed east-west distribution sand bodies, while the Yan 9 and Yan 8 formations were relatively thin, all developed three underwater distributary channel sandbodies distributed in the north, southeast and west. In the study area Yan 10, Yan 9 and Yan 8 have developed rhinoid structures, and their location and scale are inherited to a certain extent, mainly distributed in G17 well X6010 well and G22 well Q52 well area. The lower member of Yan'an formation is mainly tectonic-lithologic reservoir with sedimentary microfacies and nose structure as the main controlling factor of oil and gas accumulation. It is concluded that there are two types of oil and gas accumulation models in the study area, that is, slope area-fluvial formation model and delta front model. Combined with the distribution characteristics of sand bodies, pore and permeability characteristics, reservoir distribution characteristics and top structure characteristics, the favorable blocks of Yan 10, Yan 9 and Yan 8 reservoirs in the study area were predicted, and the 8 most favorable exploration areas were selected. It provides the basis for the exploration and development in the future.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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