综合测井在S盆地铀矿勘探开发中的应用

发布时间：2018-03-30 18:22

本文选题：大孔道　切入点：扇三角洲前缘　出处：《东北石油大学》2017年硕士论文

【摘要】：长期注水开发作用下,高含水油田油层受到注水不同程度的冲刷作用,导致储层孔渗性发生一定程度变化。部分井层受水洗破坏严重,形成大孔道,从而造成注入水的无效循环,使储层非均质程度加剧,严重影响储层内部剩余油的挖潜。研究大孔道识别方法及大孔道分布规律对高含水期油田的剩余油挖潜具有重要意义。本文主要以曙266区块杜家台油层组为例,在沉积学、开发地质学、油层物理学等理论指导下,首先研究了研究区目的层的主要地质特征,曙266区块属于构造-岩性油气藏,目的层杜家台油层组主要属于扇三角洲前缘沉积,岩石类型以岩屑质长石砂岩和长石质岩屑砂岩为主。胶结物含量较低,以泥质胶结为主,岩石相对疏松。研究了本区块大孔道的识别特征。在动态资料上,吸水百分数远大于临层的井层、随时间增加单层注水百分数持续增加的井层、含水率在某一时间突然增高的井层等均指示大孔道的存在;在测井曲线上则表现为自然电位幅度值、声波时差值升高、井径扩大,电阻率曲线出现幅度值和幅度差下降等。建立了测井资料解释渗透率、孔隙度、平均孔喉半径等参数的模型,利用聚类分析和判别分析确定了大孔道的五级分类划分方法,从Ⅰ到V级,大孔道性质变差。最后在分析大孔道形成条件的基础上,研究了大孔道的分布规律,Ⅰ类大孔道首先最易于出现在厚层水下分流河道中下部,或非河道砂中部核心位置;Ⅱ、Ⅲ类大孔道分布较为广泛,包括河道中部、宽阔的席状砂内部,Ⅳ、Ⅴ类大孔道多分布在河道砂、席状砂边缘、分流间湾及狭窄的席状砂内部。
[Abstract]:Effects of long-term water flooding, high water cut oil reservoir by erosion of water in different degrees, resulting in the reservoir porosity and permeability changed to a certain extent. Some wells by water layer destruction, the formation of large pores, resulting in ineffective circulation of injected water, the reservoir heterogeneity degree increasing, seriously affect the reservoir residual oil tapping. The remaining oil research and identification methods of high capacity channel pore distribution law of high water cut stage of oilfield development is of great significance. In this paper the Shu 266 area Dujiatai reservoir group as an example, in the development of geology, sedimentology, reservoir physics theory guidance, firstly study the geological characteristics of target layer in the study area the Shu 266 area belongs to the structural lithologic reservoirs, reservoir Dujiatai reservoir mainly belong to the fan delta front sedimentary rock types are mainly lithic feldspar sandstone and feldspathic lithic sandstone. The content of cement is low, argillaceous cementation, rock relatively loose identifying bighole. Research on this area. In the dynamic data, water absorption percentage is far greater than the well layer adjacent layer, with the increase of time of single layer water injection wells percentage increasing, water content increased suddenly in a moment between wells all indicate the existence of bighole; showed the natural potential amplitude in logging curve, acoustic time increases, hole enlargement, resistivity curve amplitude and amplitude decrease. Established the logging data interpretation model of porosity, permeability, average pore throat radius, using cluster analysis and discriminant analysis the five level classification method of big channel, from 1 to V, the nature of channel variation. Based on the analysis of large pore formation conditions, studied the distribution law of large pore, large pore type first and most easily In the distributary channel in the lower part of the thick layer of water, sand or non central core position; II, class III bighole is widely distributed, including central channel, sand sheet, wide channels IV, V are located in river sand, sand sheet edge, interdistributary bay and narrow the sheet sand inside.

【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P631.81;P619.14

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