石油科学通报2026，Vol.11Issue(1)：41-53,13.DOI:10.3969/j.issn.2096-1693.2026.01.004
BZ地区砂砾岩储层覆压孔渗变化规律及二元校正方法
Variation patterns and dual correction method of overburden pressure porosity and permeability in glutenite reservoirs of the BZ area
高强勇 1邵才瑞 2赵志恒 3汪瑞宏 1张福明 2许赛男 1时新磊1
作者信息
- 1. 中海石油(中国)有限公司天津分公司,天津 300459
- 2. 中国石油大学(华东)地球科学与技术学院,青岛 266580
- 3. 中国石油大学(华东)地球科学与技术学院,青岛 266580||中国石油吐哈油田分公司准东采油管理区,哈密 839009
- 折叠
摘要
Abstract
To address the challenges of poor sorting,strong heterogeneity,and unclear overburden pressure-dependent variations in porosity and permeability in glutenite reservoirs,where existing conventional sandstone correction methods are inadequate,this study investigates the Paleogene Kongdian Formation glutenite reservoirs(burial depth:3800～4100 m)in the BZ area.Using overburden pressure porosity-permeability experiments and rock mechanics test data from 13 core plugs covering the main poros-ity-permeability range,we reveal the unique variation patterns and establish a targeted correction model.The results show that this is a low-porosity,ultra-low-permeability reservoir,with matrix porosity of 5%～15%and permeability of 0.1～6 mD under ambient conditions.The pore space is dominated by intergranular and intragranular dissolution pores,with occasional microfractures,indicating significant heterogeneity.Unlike conventional sandstone reservoirs,the porosity and permeability of these glutenite reservoirs decrease following a power-law function with increasing overburden pressure.The decline gradient varies with the initial porosity and permeability at ambient pressure.Thus,the overburden pressure-dependent porosity/permeability is a bivariate function of the overburden pressure and its initial value at ambient conditions.By fitting the experimental data,we derived the quantitative relationship between the power-law coefficients and the ambient-pressure porosity/permeability,constructing a triaxial overburden pressure correction model.Incorporating rock mechanics data,a uniaxial overburden pressure bivariate correction model for in-situ conditions was also established.Accuracy verification shows that the triaxial model achieves an MSE of 0.369%for porosity and 0.281 mD for permeability.Compared to the traditional univariate model,accuracy improves by 67%and 43%,respectively,providing reliable characterization across both high and low porosity-permeability ranges.The proposed bivariate correction method fills a gap in overburden pressure porosity-permeability correction for glutenite reservoirs and solves the problem that traditional methods cannot adequately account for their strong heterogeneity.This method provides an essential correction tool for accurate reserve evaluation and productivity prediction,and offers a theoretical basis for designing efficient development strategies.关键词
砂砾岩储层/孔隙度/渗透率/覆压校正Key words
glutenite formation/porosity/permeability/overlying pressure correction分类
天文与地球科学引用本文复制引用
高强勇,邵才瑞,赵志恒,汪瑞宏,张福明,许赛男,时新磊..BZ地区砂砾岩储层覆压孔渗变化规律及二元校正方法[J].石油科学通报,2026,11(1):41-53,13.
