南海东部地区古近系测压资料流度校正与渗透率升尺度转换模型

Mobility correction and upscaling permeability conversion model of Paleogene pressure measurement data in eastern South China Sea

南海东部地区不同仪器的测压资料解释存在系统误差,导致古近系储层流度与岩心渗透率相关性较差,测压渗透率与DST渗透率匹配度较低。针对南海东部地区古近系低渗透储层,改进测压资料质量的定量评价标准,统一流度计算方法,进一步分析储层污染并建立污染校正模型,利用贝叶斯判别法建立了污染判别函数,实现污染判别及校正。结合地层测试的动态渗透率与岩心分析的静态渗透率,基于测井渗透率,建立了渗透率升尺度转换模型。结果表明,测压校正渗透率与经岩心渗透率标定的测井渗透率吻合度较高,进一步应用渗透率转换方法得到升尺度渗透率与DST渗透率较接近,显著改善了测压资料的渗透率评价精度。

Systematic errors are encountered in the interpretation of pressure data from different instruments in the eastern South China Sea;as a result,the correlation between mobility and core permeability is poor,and the matching between the permeability from pressure measurement and DST is low.Aiming at the Paleogene low permeability reservoirs in the eastern South China Sea,this paper improved the quantitative evaluation standard of pressure data quality and unified the method for mobility calculation.Reservoir pollution was analyzed to build a mobility correction model,and the discriminant function of pollution was established by the Bayesian discriminant method for pollution discrimination and correction.In addition,given the dynamic permeability from wireline formation testing and the static permeability from core analysis,the upscaling permeability conversion model was constructed considering logging permeability.The results demonstrate that the permeability corrected by pressure measurement and the logging permeability calibrated by core permeability are in good agreement,and the upscaling permeability is obtained by conversion and close to DST permeability.This study significantly improves the permeability evaluation accuracy of pressure data.