【作者】 葛海影；

【导师】 赵虹；

【作者基本信息】 长安大学 ， 古生物学与地层学， 2011， 硕士

【摘要】 鄂尔多斯盆地安塞地区位于陕北斜坡中东部偏南处,中生界油气资源比较丰富,但深层含油层系勘探和研究程度较低。本文在对野外露头、大量钻井岩心观察与描述的基础上,综合运用地层学、沉积学、石油地质学等理论和方法,利用薄片鉴定、扫描电镜、粒度分析、物性分析等测试资料及测井、试油等生产资料,进行精细地层划分与对比,沉积相类型识别,沉积相带与砂体展布规律分析,储层物性等方面研究,从而对安塞地区延长组长10油层组沉积微相有了更加深入的认识,最终优选出勘探有利区。利用区域标志层控制,结合沉积旋回特征及地层等厚原则,将研究区长10油层组划分为三个油层段(长101、长102、长103),并将主要目的层段—长101油层段细分为3个油层亚段、5个小层,分别为长1011、长1012-1、长1012-2、长1012-3和长1013,并通过多个纵横方向连井剖面进行地层对比研究,建立了安塞地区长10精细地层格架。通过岩石相、测井相等沉积相划分标志研究,分析认为安塞地区长10油层组属于三角洲平原亚相沉积,发育分流河道、河漫滩、天然堤及决口扇微相,其中分流河道微相砂体是长10储集层的骨架砂体,在长101地层垂向上发育层位较多,但主要分布在长1012小层中,砂体侧向连续性一般,垂向连通性较差；平面上分流河道砂体的发育受沉积相平面展布的控制,呈近北东—南西向条带状—网状展布。研究区长10储集岩属低—特低孔、特低—超低渗条件下的超低渗透层。影响其储层物性的主要因素为沉积相和成岩作用,局部地区受裂缝的影响较大。安塞地区延长组长10主要为岩性油藏和构造—岩性油气藏。综合分析认为,沉积相和构造背景是控制油气聚集成藏的最重要影响因素。综合沉积相带、砂体展布、构造特征及动态勘探成果等多方面因素分析,优选出多个有利勘探区块,为研究区下一步勘探开发提供地质依据。更多还原

【Abstract】 Ansai area is in the south eastern of Shanbei Slope, which is rich in Mesozoic petroleum, but the exploration of deep oil-bearing series is still in a low level. Based on research and observation of outcrops and cores in Ansai area, many test analysis data were acquired, such as thin section determination, SEM, size analysis, physical property analysis, and well logging, testing information. With theories of stratigraphy, sedimentology, petroleum geology, stratum were delicately classified and correlated, sedimentary facies type were identified, sedimentary facies belt and sand distribution regularity were recovered, and physical property were studied. On above basis, Sedimentary microfacies of the Chang 10 oil-bearing of Yanchang Formation in Ansai area is deeply understood. Finally the favorable area were found out.According to the traditional division method, Chang 10 oil-bearing strata of this area was divided into three parts (Chang 101、Chang 102、Chang 103), and Chang 101 was subdivided into Chang 1011、Chang 1012-1、Chang 1012-2、Chang 1012-3、Chang 1013. Sever connecting-well section were built which to contrast the stratum. The papar established the Chang 10 subtle stratigraphic framework in the first time in Ansai area.Through the study of petrologic characteristics and electrofacies methods, this paper belives that the Chang 10 is identified to delta plain facies,including distributary channel、alluvial flat、natural levee and crevasse splay. The deltaic plain distributery channel sand body which has short of sideway continuity and vertical connectivity is good reservoir and mainly in Chang 1012-2. The sand bodies distribute from northeast to southwest dominated by sedimentary facies.The reservoir character of Chang 10 is with low-extremely low pore and low-ultra low permeability, which is apparently controlled by sedimentary facies and diagenesis, influenced by fractures in the pockets.Chang 10 belong to Lithologic and lithologic-structural oil pool in Ansai area. By multidisciplinary analysis, we think that the main controlling factors of oil-gas accumulation are sedimentation and tectonization. Based on the analysis of sedimentary facies, distributing regularity of sand body, the character of structure and prospecting program, the favorable area can be found out in Chang 10 oil-bearing beds which provide the credibility geology gist for further exploration and exploration in this area.更多还原