基于数字岩心的致密油纳米-亚微米尺度储层特征及微观渗流规律研究

项目名称： 基于数字岩心的致密油纳米-亚微米尺度储层特征及微观渗流规律研究

项目编号： No.51474222

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 矿业工程

项目作者： 宁正福

作者单位： 中国石油大学（北京）

项目金额： 83万元

中文摘要： 致密油纳米-亚微米尺度储层孔隙结构表征、微尺度渗流规律研究是致密油开发理论中的关键科学问题。本项目拟采用先进的实验手段和新颖的研究方法开展上述关键问题的研究：运用高分辨率扫描电镜等先进实验手段对致密油储层纳米-亚微米孔隙结构进行分析研究，建立孔隙类型分类评价方案，并对储层孔喉结构及物性参数进行精细表征；基于扫描电镜及纳米CT实验的岩心图像，通过图像处理技术重构致密油储层的数字岩心，得到致密油储层的孔隙网络模型，对纳米-亚微米尺度孔喉结构特征进行综合评价，建立致密油储层微尺度渗流模拟平台；利用格子Boltzmann方法模拟致密油在纳米-亚微米尺度孔隙网络模型中的流动，分析孔隙结构对渗流性质的影响规律，探讨压力梯度分布与速度分布关系，建立描述致密油微尺度渗流的数学模型。通过上述研究完善致密油储层纳米-亚微米尺度储层特征和微观渗流规律的相关研究。

中文关键词： 致密油；储层特征；数字岩心；渗流规律；格子Boltzmann

英文摘要： Tight oil, as an alternative for conventional oil and gas, has attracted much attention around the would. The nano to micro scale formation pore structure and flow mechanics of tight oil lies in the center of the development theory. In this research plan, we intend to apply advanced experiment equipments and revolutionary method to solve the problem from the following aspects. To begin with, advanced experiments like high resolution scanning electric microscope(SEM) was applied to research the pore structure of nano to micro scale, thus build the classification scheme of pore types and characterize pore structure and petrophysical parameters. Furthermore, based on images of nano and micro scale taken from SEM and nano-CT, we reconstruct 3D digital core and extract pore network model(PNM) with the help of numerical algorithm, calculate parameters to evaluate pore-throat structure and build platform for flow simulation. Finally, we apply lattice Boltzmann method to simulate flow in the PNM, analyze effect of pore-throat structure on permeability, study the relationship between pressure drop distribution and velocity distribution and build mathematic model that describe flow mechanics of nano to micro scale. It is hoped that the research can perfect theory of tight oil exploration and exploitation..

英文关键词： tight oil;pore structure;digital core;flow mechanism;lattice Boltzmann