【作者】 张涛；

【导师】 任丽华；

【作者基本信息】 中国石油大学(华东) ， 地质资源与地质工程， 2017， 硕士

【摘要】 东风港油田沙三上亚段浊积岩岩性油藏是胜利油区车西洼陷的主要油藏类型之一,尽管在车40-44、车142-6、车40-31-斜35、车407-1等区块已开展产能建设或已投入开发,取得了较好的勘探开发效果,但是由于浊积扇体相变快、砂体分布复杂、开发区块外井网密度大等问题导致东风港油田区域研究程度较低,等时地层格架有待建立、区域沉积规律缺乏系统性认识、沉积模式尚不确定,制约了该油田沙河街组下一步油气勘探目标的确定。因此本论文以车西洼陷东风港油田沙三上亚段浊积扇沉积体系为研究对象,在前期车40-44块研究基础上,充分利用钻井、测井、地震、分析化验等相关资料,开展了等时地层划分划分与对比、浊积砂体沉积特征、类型及展布规律研究,取得了以下研究成果:(1)以层序地层学、沉积学为指导,借助地球物理资料,建立了沙三上亚段地层划分对比方案,将沙三上亚段地层划分为4个砂组26个小层,解决了沙三上亚段顶界面认识不清的问题,实现了层序地层约束下的全区地层统层,建立了东风港油田沙三上亚段段等时地层格架;(2)明确提出沙三上亚段发育补给水道供给为主的陆相断陷湖盆缓坡断阶型浊积扇沉积体系,浊积扇沉积分为有水道型和无水道型两种,有水道型主要发育扇根主水道、主水道间、扇中辫状水道、辫状水道间、朵叶体等微相类型;(3)将地球物理技术与地质分析相结合,阐明了浊积扇体展布规律,建立了沉积相模式,认为沙三上亚段主要发育四期浊积扇体,扇体规模自下向上逐渐增大,沿物源方向具有较明显的进积特征,垂直物源方向侧向频繁迁移,侧向连续性相对较差;(4)明确了砂体成因类型,阐明了砂体展布规律,提出湖平面变化、构造运动、沉积物供给等因素是控制沙三上亚段砂体展布的主控因素,并指出4个有利砂体发育区作为下一步滚动勘探重点。研究成果对指导和深化该地区勘探具有重要意义。更多还原

【Abstract】 Turbidite reservoir of the upper submember of the third member of Shahejie Formation is one of the main reservoir type in the Dongfenggang Oilfield.Despite positive results in oil exploration and development in blocks,such as Che40-44,Che142-6,Che40-31-x35,and Che407-1,the problems of frequent turbidite fan migrating,complex sand body distribution,and high density well spreading outside the target blocks leads to,incomprehensive understanding and more work should be done,isochronous stratigraphic framework establishing,systematic regional sedimentary laws building,the sedimentary model forming,to better determination of the exploration targets in this oil fields.As a result,this paper take the turbidite fan of Sha-3 upper sub-member,a major blocks of Dongfenggang Oilfield,as the research subject.Based on previous study of Che40-44 block,with the help of drilling data,well logs,seismic data and laboratory test analysis etc.,this research develops the isochronous stratigraphic division and correlation,determines turbidite sand body sedimentary characteristics,types and its distribution.The results are as following:(1)Guided by stratigraphy and sedimentology knowledge,with the aid of geophysical data,this study established the stratigraphic classification and correlation in the upper sub-member of Sha-3.It is divided into 4 sand bed sets and 26 layers.We determined the top boundary,achieved the region layer unification under the sequence stratigraphy restrain,and established the isochronous stratigraphic framework;(2)This research proposed that turbidite fan sedimentary system is mainly supplied by feeder channels which are developed on the gentle slope of fault trough lake basin in Sha-3 upper sub-member of this area.Turbidite fan can be divided into channel-presence and channel-absence.,Channel-presence turbidite can be divided into main channel,inter main channel,braided-channel in middle fan,inter braided channel in middle fan and sand lobate;(3)Combining geophysical technique and geological analysis,this research clarified the turbidite fans distribution,and established sedimentary facies model.There are four phases turbidite fans developed in upper sub-member of Sha-3,whose scale gradually increase from bottom to top.Sediment prograde along the provenance direction and frequent migrate laterally in vertical source direction,resulting in,relatively poor continuity in lateral direction;(4)This study clarified the genetic types of sand body and its distribution.Lake level changes,tectonic movement and sediment supply are the main controlling factors of sand body distribution.We proposed four favorable area for the next round of rolling exploration and development.The results are of great significance for guiding and deepening the understanding of the exploration in the target area.更多还原