基于核磁共振标定的高压压汞孔喉分布定量评价方法

发布时间：2018-04-29 11:28

本文选题：核磁共振 + 三孔隙度组分百分比法　；参考：《岩矿测试》2017年06期

【摘要】：孔喉分布是控制低渗-致密砂岩储层物性的关键因素,其评价依托于各种储层微观特征测试方法,需要综合多方法各自优势进行孔喉分布定量表征。本文提出基于核磁共振标定的高压压汞孔喉分布定量评价的方法,即通过核磁共振离心前后横向弛豫时间T_2谱图对比,依据流体赋存状态重新划分三孔隙度组分百分比法的T_2值界限T_(21)和T_(22),对应将孔喉划分为束缚流体孔喉、过渡流体孔喉和可动流体孔喉,再结合T_2值与孔喉半径的关系将T_2值界限转化为孔喉半径界限r_1和r_2,最终依据高压压汞统计的不同流体赋存状态的孔喉含量S_1、S_2和S_3进行孔喉分布定量评价。该方法综合了核磁共振有效表征孔喉流体赋存状态和高压压汞有效表征孔喉大小的优势。将此方法应用于西湖凹陷花港组低渗-致密砂岩储层孔喉分布评价,建立了T_2值与孔喉半径平均转化系数C为0.0079,求取r_1和r_2为60 nm和160 nm,依据各类孔喉含量及其相互关系将孔喉分布划分为四类,从而为储层评价提供新的参数和思路。
[Abstract]:The distribution of pore and throat is the key factor for controlling the physical properties of low permeability and tight sandstone reservoirs. Its evaluation relies on the microscopic characteristics of various reservoirs. The quantitative characterization of pore throat distribution is required by the comprehensive multi methods. This paper proposes a method for quantitative evaluation of Hg pore throat distribution based on nuclear magnetic resonance, that is, by NMR centrifugation. Before and after the lateral relaxation time T_2 spectrum comparison, the T_2 value boundary of the three porosity component percentage method is re divided into T_ (21) and T_ (22) according to the fluid occurrence state, and the pore throat is divided into the bound fluid pore throat, the transition fluid pore throat and the movable fluid pore throat, and then the T_2 value boundary is converted to the pore throat radius boundary with the relation of the T_2 value to the pore throat radius. R_1 and r_2 are limited to the pore throat content S_1, S_2 and S_3 according to the high pressure mercury pressure, and the pore throat distribution is evaluated quantitatively. This method combines the effective characterization of pore throat fluid and the advantage of high pressure mercury to effectively characterize the pore throat size. This method is applied to the low permeability and density of Huagang group in West Lake depression. The distribution of pore throat distribution in sandstone reservoirs has been evaluated. The average conversion coefficient of T_2 value and pore throat radius is C 0.0079, and r_1 and r_2 are 60 nm and 160 nm. The pore throat distribution is divided into four types according to the pore throat content and their relationship, thus providing new parameters and ideas for reservoir evaluation.

【作者单位】：中国石油大学(华东)地球科学与技术学院;山东省油藏地质重点实验室;
【基金】：“十三五”国家科技重大专项(2016ZX05027-004) 国家自然科学基金面上项目(41672129) 山东省沉积成矿作用与沉积矿产重点实验室开放基金(DMSM201411)
【分类号】：P618.13

【相似文献】