东辛永3断块低级序断层特征及分布模式研究

发布时间：2018-11-03 15:05

【摘要】：东辛油田永3断块区位于东营凹陷的东北部、民丰洼陷东南部,受一条北界南倾近东西向的永3三级断层控制,为倾向向南的断鼻构造,主要含油层位为沙河街组二段。目前永3断块已进入特高含水的开发后期,低级序断层广泛发育且分布位置识别不清,导致现有注采井网不匹配、注水开发矛盾严重,采收率效率低。本论文综合利用测井、地质、地震以及生产开发资料,开展了研究区地层划分与对比、主断裂特征分析、低级序断层的井震结合识别、低级序断层分布特征和分布模式,以及低级序断层对注水开发影响等研究,主要取得了以下成果和认识:(1)建立了永3断块区沙河街组二段地层格架,认为研究区沙二段砂体分布及连通特征受断层影响最大。南北向的剖面呈地堑状,发育一系列阶梯状的断层。东西向的剖面呈地垒状,两侧的断裂呈阶梯状分布。(2)三维地震剖面中主断裂相互呈“y”形斜交,整体为以宽缓地堑为主。平面上永3断块呈南倾的断鼻构造,内部发育两个北倾的次级断鼻构造控块断层系。(3)蚂蚁追踪识别低级序断层效果受参数设置影响,垂向扫描步长、初始边界等5个参数对低级序断层平面延伸长度效果影响较大,而非法步长和合法步长影响较小。测井识别的单井断点与蚂蚁追踪识别出的低级序断层的断裂痕迹相重合,具有良好的匹配性,井震结合精细刻画了研究区低级序断层的展布。(4)研究区低级序断层大部分属于高角度断层,以五级、六级断层为主;主要分布在高级序断层的下降盘,且在各类背斜上总体形成放射状的低级序断层组合样式,在缓坡带断块区形成以“y”型、地堑型和阶梯型为主的低级序断层组合,在深洼区周边断裂带发育区主要形成地堑型和“y”型低级序断层组合。(5)五级断层控制剩余油分布,六级断层影响注采井网部署,建立了高级序断层与低级序断层联合控制型、低级序断层内部的组合样式控制型两种模式。
[Abstract]:The Yong3 fault block in Dongxin oilfield is located in the northeast of Dongying sag and in the southeast of Minfeng sag. It is controlled by a third stage fault of Yong3, which is trending south towards east to west. The main oil-bearing layer is the second member of Shahejie formation. At present, Yong3 fault block has entered the late stage of super high water cut, the low order fault is widely developed and the distribution location is not clear, which leads to the mismatch of the existing injection-production pattern, the serious contradiction of water injection development, and the low recovery efficiency. Based on the data of logging, geology, seismology and production and development, this paper has carried out stratigraphic division and correlation of study area, analysis of main fault characteristics, combined identification of well and earthquake of low-grade sequence fault, distribution characteristics and distribution pattern of low-grade sequence fault. As well as the influence of low-grade sequence faults on waterflooding development, the following achievements and understandings have been obtained: (1) the formation framework of the second member of Shahejie formation in Yong3 fault block has been established. It is considered that the distribution and connectivity characteristics of sand bodies in the second member of sand in the study area are most affected by faults. The south-north profile is graben-like and a series of ladder-like faults are developed. The east-west profile shows a barrier shape, and the faults on both sides are stair-like. (2) in the 3D seismic profile, the main faults are "y" oblique and the whole is a wide and gentle graben. The fault nose structure of Yong3 fault block is trending to the south on the plane, and two northerly fault-nose structure fault systems are developed inside. (3) the effect of ant tracking identification of low order fault is affected by the setting of parameters and the vertical scanning step. Five parameters, such as the initial boundary, have a great effect on the extension length of the low-order fault plane, but the illegal step size and the legal step length have little effect. The single well fracture point identified by logging coincides with the fault trace of low order fault identified by ant tracking, and it has good matching property. Well earthquakes combined with fine description of the distribution of low-grade sequence faults in the study area. (4) most of the low-grade sequence faults in the study area belong to high-angle faults, mainly of magnitude five and six. It mainly distributes in the descending face of the high order fault, and generally forms the radial low order fault combination style on all kinds of anticlines, and forms the "y" type, graben type and ladder type low order fault combination in the fault block area of the gentle slope belt. The low order fault assemblages of graben type and y type are mainly formed in the developed area of the fault zone around the deep depression area. (5) the fifth grade fault controls the remaining oil distribution, and the sixth grade fault affects the layout of injection-production well pattern. Two types of combined control mode of high sequence fault and low sequence fault and combined style control type of low order fault are established.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

【相似文献】