基于核磁共振标定的高压压汞孔喉分布定量评价方法

孙小龙; 张宪国; 林承焰; 赵仲祥; 马存飞; 林建力

doi:10.15898/j.cnki.11-2131/td.201706110097

基于核磁共振标定的高压压汞孔喉分布定量评价方法

1.
中国石油大学(华东)地球科学与技术学院, 山东青岛 266580

2.
山东省油藏地质重点实验室, 山东青岛 266580

基金项目:
“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）

详细信息

作者简介: 孙小龙, 硕士研究生, 主要从事储层地质学研究。E-mail:upc_sxl@126.com

通讯作者: 张宪国, 博士, 硕士生导师, 主要从事油藏描述和储层地质学研究。E-mail:zhangxianguo@upc.edu.cn

中图分类号: P574.19;TE135.4

收稿日期: 2017-06-11

修回日期: 2017-07-20

录用日期: 2017-08-14

Quantitative Evaluation Method of HPMI Pore-throat Distribution Based on NMR Calibration

1.
School of Geosciences, China University of Petroleum, Qingdao 266580, China

2.
Shandong Province Key Laboratory of Reservoir Geology, Qingdao 266580, China

More Information

Corresponding author: Xian-guo ZHANG, zhangxianguo@upc.edu.cn

Received Date: 11 June 2017

Revised Date: 20 July 2017

Accepted Date: 14 August 2017

摘要

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T₂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T₂值界限T₂₁和T₂₂，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T₂值与孔喉半径的关系将T₂值界限转化为孔喉半径界限r₁和r₂，最终依据高压压汞统计的不同流体赋存状态的孔喉含量S₁、S₂和S₃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T₂值与孔喉半径平均转化系数C为0.0079，求取r₁和r₂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。
- 核磁共振 /
- 三孔隙度组分百分比法 /
- T₂截止值 /
- 高压压汞 /
- 孔喉分布
Abstract: Pore throat distribution is an important factor controlling the physical properties of low-permeability and tight sandstone reservoirs. The evaluation of pore throat distribution is based on the analytical methods of micro features of reservoirs, and it is necessary to synthesize multiple methods to quantify the pore throat distribution. Quantitative evaluation method of High Pressure Mercury Injection (HPMI) pore throat distribution was developed based on Nuclear Magnetic Resonance (NMR) calibration. Fluid states can be identified by the comparison of transverse relaxation time T₂ spectrum before and after centrifugation, which enables the redefining of T₂ boundaries (T₂₁ and T₂₂) of three pore components of NMR. Furthermore, pore throat is divided into irreducible fluid pore throat, transition fluid pore throat and movable fluid pore throat accordingly. T₂ boundaries are then converted to pore throat radius boundaries r₁ and r₂ by the correlativity between T₂ value and pore throat radius. Finally, pore throat distribution is evaluated quantitatively by statistics of the content of various types of pore throat (S₁, S₂ and S₃). This method combines the advantages of HPMI describing fluid states and NMR characterizing pore throat size. The method was applied to evaluate the pore throat distribution of low-permeability and tight sandstone reservoirs in the Huagang Formation of Xihu Depression. The average conversion coefficient C between T₂ value and pore throat radius is 0.0079, and pore throat radius boundaries r₁ and r₂ are 60 nm and 160 nm, respectively. Pore throat is classified into four types according to the content of various types of pore throat, which provides new parameters and thought for further reservoirs evaluation.
- Nuclear Magnetic Resonance /
- percentages of three pore components /
- T₂ cutoff value /
- high pressure mercury injection /
- pore-throat distribution

HTML全文

图 1 改进的核磁共振三孔隙度组分百分比法示意图

Figure 1.

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图 2 核磁共振与高压压汞孔隙分量和累积量分布曲线

Figure 2.

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图 3 高压压汞三孔隙度组分百分比法示意图

Figure 3.

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图 4 依据S₁、S₂和S₃大小和相互关系的孔喉分布分类方案

Figure 4.

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图 5 各类孔喉分布类型岩石学特征和孔隙结构特征

Figure 5.

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