齐家地区高Ⅲ高Ⅳ油层组沉积微相及控藏作用

发布时间：2018-03-25 02:24

本文选题：沉积微相　切入点：砂体　出处：《东北石油大学》2015年硕士论文

【摘要】：应用高分辨率层序地层学理论,综合岩矿学、生物地层学、地球化学和地球物理资料,对齐家地区高台子油层进行高分辨率层序地层学研究,在齐家地区高台子油层高三、高四油层组识别出两种界面类型,一是三角洲分流平原与滨浅湖相基准面下降与上升的转换面,二是三角洲前缘反旋回的顶部,最大湖泛面与层序界面重合。并以此为基础在高三、高四油层组划分了2个四级层序、5个五级层序,细划为高三上、高三下、高四上、高四中、高四下五个地层单元。确定了齐家地区大型席状三角洲体系沉积特征,三角洲前缘相带分布广,砂体广泛发育,三角洲内外前缘控制了分流河道、河口坝以及席状砂砂体的分布范围,其中分流河道、河口坝砂体厚度大、连续性差;席状砂,砂体稳定,连续性好。三角洲前缘相带及滨浅湖砂坝是齐家地区高台子油层高三、高四油层组有利成藏相带。首次开展区带级、多工区井震结合大比例尺沉积微相编图,对沉积微相的刻画更加精细,沉积微相的边界更加精确,实现“纵向细化、横向放大”的目标,使沉积相图更具有实际意义。进一步发展了三维地震沉积解释技术及三维区大比例尺沉积微相制图技术,通过砂体精细解剖,明确了不同相带砂体类型及规模,通过油水关系与沉积相带分析,确定齐家地区高台子油层组有利区分布位置,有效指导了勘探部署。
[Abstract]:Using the theory of high-resolution sequence stratigraphy and synthesizing petrology, biostratigraphy, geochemistry and geophysical data, the high-resolution sequence stratigraphy of Gaotaizi oil reservoir in Qijia area was studied. Two types of interfaces have been identified in the Gao4 formation, one is the conversion surface of the delta distributary plain and the shallow-lacustrine facies datum, the other is the top of the deltaic front counter-cycle. On the basis of the overlap between the pan surface of the largest lake and the sequence interface, the formation of Gao 3 and Gao 4 oil beds has been divided into two fourth order sequences, five five order sequences, which are subdivided into upper high grade three, high three lower, high four upper and high four middle. The sedimentary characteristics of the large sheet delta system in Qijia area are determined. The delta front facies belt is widely distributed, the sand body is widely developed, and the delta inner and outer front controls the distributary channel. The distributional range of estuarine bar and sheet sand body, in which distributary channel, estuarine bar sand body thickness is big, continuity is poor; sheet sand, sand body is stable, continuity is good.; Delta front facies belt and shore shallow lake sand bar are high grade three of Gaotaizi oil reservoir in Qijia area, It is the first time to develop zone level, multi-work area well and earthquake combined with large scale sedimentary microfacies mapping. The sedimentary microfacies are characterized more finely, the boundary of sedimentary microfacies is more accurate, and the "longitudinal refinement" is realized. The aim of transverse enlargement is to make sedimentary facies diagram more practical. The 3D seismic sedimentary interpretation technology and the 3D area large scale sedimentary microfacies mapping technology are further developed, and the fine dissection of sand body is carried out. The types and scales of sand bodies in different facies zones are defined. Through the analysis of oil-water relationship and sedimentary facies belts, the distribution of favorable areas of Gaotaizi formation in Qijia area is determined, and the exploration deployment is effectively guided.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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