测井技术2026，Vol.50Issue(4)：647-654,8.DOI:10.16489/j.issn.1004-1338.2026.04.008
黏土对蒸馏抽提法密闭取心样品饱和度影响分析
Analysis of the Influence of Clay on Dean-Stark Saturation of Sealed Coring Samples
摘要
Abstract
Measured oil and water saturations from sealed core samples are the fundamental data for reservoir oil-bearing evaluation.However,for montmorillonite-rich formations,when the Dean-Stark distillation method is used to determine core fluid saturations,the structural water within montmorillonite releases during high-temperature distillation,causing systematic overestimation of the measured water saturation,and the laboratory saturation results cannot truly reflect the original underground formation state.To quantitatively evaluate the interference of clay minerals on saturation measurements obtained by distillation,this study takes the Minghuazhen formation of Bohai B oilfield as the research object,selects four mudstone cores to carry out variable-temperature thermogravimetric tests,and quantitatively characterizes the release characteristics of bound water and interlayer water in different mudstone samples.Based on the rock volume physical model,combined with clay content and clay-water loss ratio,a clay correction method for saturation is established for shaly sandstone reservoirs.The experimental results show that the clay-water loss characteristics of mudstones under the same sedimentary environment are stable;at the standard Dean-Stark distillation temperature(116℃),the clay-water loss percentage is 20.1%.After simultaneously performing clay correction and fluid loss correction,the corrected core water saturation matches well with the MICP and well log interpretation results,and the absolute error can be controlled within-5%～5%.This correction method effectively solves the problem of distorted fluid saturation measurement in montmorillonite-bearing shaly sandstone reservoirs and can provide technical support for accurate evaluation of oil-bearing properties in similar reservoirs.关键词
蒙脱石/泥质砂岩/黏土水校正/蒸馏抽提法/热失重实验/密闭取心/饱和度校正Key words
montmorillonite/shaly sandstone/clay interlayer water correction/Dean-Stark distillation/thermogravimetric analysis/sealed coring/saturation correction分类
天文与地球科学引用本文复制引用
张建升,时新磊,陆云龙,刘欢..黏土对蒸馏抽提法密闭取心样品饱和度影响分析[J].测井技术,2026,50(4):647-654,8.基金项目
中海石油(中国)有限公司综合科研项目"渤海水驱稠油油田特高含水期深度挖潜关键技术研究"(KJZH-2024-2204) （中国）
