基于驱替实验及数字岩心的微观剩余油研究

发布时间：2018-05-09 13:18

本文选题：微观剩余油 + 微观仿真模型　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：基于微观驱替实验和数字岩心的剩余油研究以微观仿真模型的制作和高温高压驱替实验为基础,通过X射线CT扫描构建三维数字岩心,对孔喉网络结构提取和分析,并结合微观驱替机理和微观剩余油形成机理,进行剩余油分布预测。微观仿真模型以地层孔隙结构为基础,由激光刻蚀光学玻璃制作而成,能模拟高温高压条件下微观驱替过程,便于观察和记录,用于探究微观剩余油形成机理和分布特征。同时,优选样品进行X射线CT扫描,经过叠加重建、体积元提取、滤波降噪处理、阈值分割、图像平滑处理、提取孔喉网络骨架等步骤,模拟孔喉网络结构。实验模拟和数字模拟结合,精细刻画微观剩余油特征,相互佐证检验,提高模拟精度与可信度。研究区塔中402油藏截止目前已无井生产,停产前含水100%,油藏特征总结为高含水、高采出程度、高温、高压、高矿化度、低非均质程度的“五高一低”特征。由于常年水驱注采开发,导致地下储层的孔喉网络结构、岩石骨架颗粒、粘土矿物的类型和赋存方式、以及渗流特征等诸因素不断变化,从而使高含水期微观剩余油的形成机理与分布模式非常复杂。因此,为进行研究区微观剩余油研究,本论文重点开展了高温高压微观仿真模型驱替实验以及X射线CT扫描构建三维数字岩心两项工作。三维数字岩心分析提取而成的孔喉网络结构能够直观清晰地表征不同尺寸的孔隙形态和分布,驱替实验能够精细描述微观剩余油类型及其分布特征。针对研究区问题,使用两种模拟技术进行协同分析,揭示剩余油形成机理,分析剩余油潜力,预测剩余油分布,并提出合理的三次采油技术选择方案,为塔里木油田进一步生产开发提供理论基础和指导。
[Abstract]:Based on micro displacement experiment and digital core residual oil research, based on micro simulation model and high temperature and high pressure displacement experiment, 3D digital core is constructed by X ray CT scanning, and the network structure of pore throat is extracted and analyzed. Combined with micro displacement mechanism and micro residual oil formation mechanism, residual oil distribution is predicted. The microscopic simulation model is based on the formation pore structure and is made of laser etched optical glass. It can simulate the microscopic displacement process under high temperature and high pressure and is easy to observe and record. It can be used to study the formation mechanism and distribution characteristics of micro residual oil. At the same time, the optimized sample is scanned by X ray CT, after superposition reconstruction, volume element extraction, filtering and noise reduction, threshold segmentation, image smoothing, extraction of pore throat network skeleton and so on, the network structure of pore throat is simulated. The experimental simulation and digital simulation are combined to depict the microscopic remaining oil characteristics and verify each other to improve the accuracy and reliability of the simulation. Tazhong 402 reservoir in the study area has no well production up to now and has 100 water cut before shutdown. The reservoir characteristics are summarized as high water cut, high recovery degree, high temperature, high pressure, high salinity, low heterogeneity and "five high and one low" characteristics. As a result of perennial water flooding and production development, the pore throat network structure, rock skeleton particles, clay minerals types and occurrence patterns, and seepage characteristics of underground reservoirs are constantly changing. Therefore, the formation mechanism and distribution model of micro residual oil in high water cut period are very complicated. Therefore, in order to study the micro residual oil in the study area, this paper focuses on two tasks: high temperature and high pressure microscopic simulation model displacement experiment and X-ray CT scanning to construct 3D digital core. The pore throat network structure obtained by 3D digital core analysis can clearly characterize the pore morphology and distribution of different sizes, and the displacement experiment can describe the microcosmic remaining oil types and their distribution characteristics in detail. In view of the problems in the study area, two simulation techniques are used to carry out cooperative analysis, to reveal the formation mechanism of residual oil, to analyze the potential of remaining oil, to predict the distribution of remaining oil, and to put forward a reasonable technical selection scheme for tertiary oil recovery. It provides theoretical basis and guidance for further production and development of Tarim Oilfield.
【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】：TE327

【引证文献】