摘要
孔隙度校正系数对于疏松砂岩孔隙度校正量的影响较大,目前疏松砂岩孔隙度校正系数采用的是固结砂岩的经验值0.619。通过对明华镇组、馆陶组、东营组地层的疏松砂岩和沙河街组的固结砂岩进行泊松比测试试验研究,结果表明,明华镇组、馆陶组、东营组地层的疏松砂岩孔隙度校正系数分别为0.77、0.72、0.70,沙河街组孔隙度校正系数为0.64,疏松砂岩与固结砂岩的孔隙度校正系数差异较大,并且孔隙度校正系数与岩石视密度、粒度中值呈负相关关系;随着岩样孔隙度增大,岩样孔隙度校正量也呈逐渐增大趋势。利用孔隙度校正系数的经验值和实测值对明化镇组、馆陶组、东营组三个层位疏松砂岩的地面孔隙度进行校正,发现采用经验值0.619计算的地层孔隙度值误差较大,其平均校正误差分别为4.0%、2.1%、3.1%,超过了岩心分析标准的最大误差范围,说明孔隙度校正经验值0.619并不适用于疏松砂岩。因此,对于疏松砂岩油藏建议实测岩石泊松比计算孔隙度校正系数,制作孔隙度校正图版来提高容积法储量计算精度。
Porosity correction coefficient has great influence on porosity correction of loose sandstone, however, the present porosity correction coefficient of loose sandstone is 0.619, which is the empirical value of consolidated sandstone. The study of poisson’s ratio test of the loose sandstone in Minghuazhen formation, Guantao formation, Dongying formation and the consolidated sandstone in Shahejie formation shows, the porosity correction coefficient of the loose sandstone in Minghuazhen formation, Guantao formation and Dongying formation were 0.77, 0.72 and 0.70, and the consolidated sandstone in Shahejie formation is 0.64. It has a big differences between loose sandstone and consolidated sandstone, while the Porosity correction coefficient of sandstone has a negative correlation with rock apparent density and median grain diameter. Besides, with the porosity increasing, the rock corrected value increased gradually. Using the empirical and experimental values of the porosity correction coefficient corrected the surface porosity of the loose sandstone in Minghuazhen formation, Guantao formation and Dongying formation, it is found that the error of formation porosity is larger with the calculation of the empirical value of 0.619, the average correction error were 4%, 2.1%, 3.1% respectively. Beyond the maximum error range of the core analysis standard, it is showed that the porosity correction is not applicable to the loose sandstone in 0.619. Therefore, the porosity correction coefficient of the proposed measured rock Poisson’s ratio is recommended for the loose sandstone reservoir, making the porosity correction chart to improve the calculation accuracy of volumetric reserves.
作者
马立涛
李洋冰
陈鑫
柳雪青
胡维强
刘成
邓挺
Ma Litao;Li Yangbing;Chen Xin;Liu Xueqing;Hu Weiqiang;Liu Cheng;Deng Ting(CNOOC EnerTech-Drilling ＆ Production Co.,Tianjin 300452,China)
出处
《非常规油气》
2018年第5期8-13,共6页
Unconventional Oil & Gas
关键词
疏松砂岩
校正系数
泊松比
孔隙度
容积法
loose sand
correction coefficient
poisson＇s ratio
porosity
volumetric method
