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一种评价致密砂岩储层孔隙结构的新方法及其应用(英文)
引用本文:李潮流,周灿灿,李霞,胡法龙,张莉,王伟俊. 一种评价致密砂岩储层孔隙结构的新方法及其应用(英文)[J]. 应用地球物理, 2010, 7(3): 283-291. DOI: 10.1007/s11770-010-0254-0
作者姓名:李潮流  周灿灿  李霞  胡法龙  张莉  王伟俊
作者单位: 
基金项目:supported by Major National Oil & Gas Specific Project(Grant No.2008ZX05020-001)
摘    要:致密砂岩储层的孔隙结构对其渗透性和电性影响显著,是此类复杂储层岩石物理研究的关键。针对仅从连通喉道半径评价渗透率的多解性以及储层孔隙结构与电性关系研究欠缺等不足,综合影响物性的主要因素,提出了一种同时考虑孔隙度、最大连通喉道半径及分选性三种因素的新型孔隙结构参数δ的计算公式。利用岩心及实测数据对比分析表明,δ值能够较连通喉道半径等传统方法更精确地刻画致密砂岩储层渗透性,同时它与储层电性具有密切关系,可用于估算地层因素F和胶结指数m。据此提出将孔隙结构对电阻率的影响进行归一化校正以及基于核磁共振测井预测储层完全含水电阻率R0的评价方法,从而突出储层流体性质变化引起的电性变化,并提供了一种新的致密砂岩储层流体识别思路,研究结果得到了实验资料和实际测井试油资料的验证。

关 键 词:低孔低渗  致密砂岩  孔隙结构  核磁共振  岩石物理

A novel model for assessing the pore structure of tight sands and its application
Chao-Liu Li,Can-Can Zhou,Xia Li,Fa-Long Hu,Li Zhang,Wei-Jun Wang. A novel model for assessing the pore structure of tight sands and its application[J]. Applied Geophysics, 2010, 7(3): 283-291. DOI: 10.1007/s11770-010-0254-0
Authors:Chao-Liu Li  Can-Can Zhou  Xia Li  Fa-Long Hu  Li Zhang  Wei-Jun Wang
Affiliation:(1) Institute (CSIR), National Geophysical Research, Uppal Road, Hyderabad, Andhra Pradesh, India, 500007;(2) CSIRO Petroleum Resources ARRC, 26 Dick Perry Ave, Kensington, Perth, Western Australia, 6151, Australia
Abstract:Pore-structure poses great influence on the permeability and electrical property of tight sand reservoirs and is critical to the petrophysical research of such reservoirs. The uncertainty of permeability for tight sands is very common and the relationship between porestructure and electrical property is often unclear. We propose a new parameter δ, integrating porosity, maximum radius of connected pore-throats, and sorting degree, for investigating the permeability and electrical properties of tight sands. Core data and wireline log analyses show that this new δ can be used to accurately predict the tight sands permeability and has a close relation with electrical parameters, allowing the estimation of formation factor F and cementation exponent m. The normalization of the resistivity difference caused by the porestructure is used to highlight the influence of fluid type on Rt, enhancing the coincidence rate in the Pickett crossplot significantly.
Keywords:low permeability  tight sand  pore-structure  NMR  rock physics  
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