西南石油大学学报(自然科学版)

• 石油与天然气工程 •    

利用数字岩芯评价疏松砂岩气藏渗流特征

王小鲁1,2 *,刘洪3,庞进3,周瑾4,华青5   

  1. 1.“油气藏地质及开发工程”国家重点实验室· 西南石油大学,四川成都610500;
    2. 中国石油青海油田分公司天然气开发公司,青海格尔木816000;3. 重庆科技学院石油与天然气工程学院,重庆沙坪坝401331;
    4. 中国石油西南油气田分公司川西北气矿,四川江油621700;5. 中国石油西南油气田分公司重庆气矿,重庆江北400021
  • 出版日期:2015-04-01
  • 通讯作者: 王小鲁,E-mail:wxlqh@petrochina.com.cn

Evaluating the Seepage Characteristics of Unconsolidated Sandstone Gas
Reservoir by Digital Core

Wang Xiaolu1,2*, Liu Hong3, Pang Jin3, Zhou Jin4, Hua Qing5   

  1. 1. State Key Laboratory of Oil and gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China;
    2. Qinghai Oilfield Natural Gas Development Company,PetroChina,Golmud,Qinghai 816000,China;
    3. School of Petroleum and Natural Gas Engineering,Chongqing University of Science and Technology,Shapingba,Chongqing 401331,China;
    4. Northwest Sichuan Gas Field of Southwest Oil & Gas Field Branch,PetroChina,Jiangyou,Sichuan 621700,China;
    5. Chongqing Gas Field of Southwest Oil & Gas Field Branch,PetroChina,Jiangbei,Chongqing 400021,China
  • Online:2015-04-01

摘要:

针对疏松砂岩气藏岩石物理性质的测试存在取芯难、岩芯易水化和出砂,传统的岩芯驱替实验无法准确评价
其渗流特征的问题,利用数字岩芯技术对其开展了渗流特征的研究。研究中以涩北疏松砂岩气藏某井岩芯为研究对
象,首先利用CT 扫描仪扫描岩芯样品,获取岩芯的三维图像,抽取数字信息,将多孔介质的孔隙结构直接映射至网
络,并利用分形几何原理建立数字岩芯,再从中抽提出三维孔隙网络模型;然后将模型计算结果与真实岩芯实验值进
行对比和校正,获取客观有效的数字岩芯模型;最后利用该数字岩芯模型计算了不同有效应力、不同地层水伤害时间
以及不同泥质含量状态下的渗流物理参数和相对渗透率,为疏松砂岩气藏的开发提供了重要的岩石物理基础数据。

Abstract:

To solve the problems of hard coring,easy hydration for core and sand production during the test of physical
properties of rock in unconsolidated sandstone gas reservoir,We carried out the study of the seepage characteristics by digital
core technology while the traditional core displacement experiment cannot evaluate its seepage characteristics precisely. Based
on the core of a well in Sebei unconsolidated sandstone gas reservoir,firstly,we scan the core samples to get their 3D images
with CT scanner,and extract digital information,put the pore structure to directly map onto the network model,establish the
digital core and extract the 3D pore network model from it according to the fractal principle. And then,we put the model
calculation results and real core experimental results in comparison and correction,and get the effective model of digital core.
Finally,use this model of digital core to calculate the physical seepage parameters and relative permeability in various states
of effective stress,formation water damaging time and shale content so that it could provide important basic data physical of
rock for the unconsolidated sandstone gas reservoir development.