摘要
南海莺歌海盆地X气田普遍发育高温高压气藏,钻井液比重大、储层段暴露时间长,电阻率测井受钻井液侵入影响较大,基于电阻率测井资料的储层饱和度评价精度明显降低;同时,X气田储层成岩作用差异大,孔隙结构复杂,导致地层岩电参数变化较大。针对电法测井难以准确反映高温高压强侵入储层段饱和度的难题,开展三轴应力条件下毛管压力实验,基于温压条件下毛管压力资料分析处理,并考虑温压条件对界面张力等关键参数的影响,构建强侵入储层非电法饱和度精细评价方法。现场应用表明,相比于常规电阻率测井评价方法,毛管压力资料能够更加真实地反映强侵入段地层孔隙结构及饱和度分布,从而更准确地评价储层饱和度。
High-temperature and high-pressure gas reservoirs are widely developed in X gas field in Yinggehai Basin of South China Sea,with characteristics of heavy drilling fluid ratio and longtime exposure of reservoir sections.As the resistivity logging is greatly affected by drilling fluid invasion,the accuracy of reservoir saturation evaluation based on resistivity logging data is reduced.In addition,it’s difficult to get saturation parameters due to the large diagenesis difference and complex pore structure in X gas field.Aiming at the problem that it is difficult to effectively evaluate reservoir saturation by electrical logging in high-temperature,high-pressure and strong invasion reservoir,based on capillary pressure experiment under high-temperature and high-pressure triaxial stress condition,the analysis and processing are carried out,and the non-electrical saturation fine evaluation is constructed considering the variation law of temperature and pressure conditions on key parameters.The application shows that compared with the resistivity logging data,the capillary pressure data more accurately reflect the pore structure and saturation distribution,providing a more accurate saturation evaluation.
作者
杨冬
胡向阳
张恒荣
杨毅
袁伟
YANG Dong;HU Xiangyang;ZHANG Hengrong;YANG Yi;YUAN Wei(Zhanjiang Company of China National Offshore Oil Corporation(CNOOC)Ltd.,Zhanjiang 524057,Guangdong,China;Hainan Company of China National Offshore Oil Corporation(CNOOC)Ltd.,Haikou 570311,Hainan,China)
出处
《石油地质与工程》
CAS
2023年第4期76-80,共5页
Petroleum Geology and Engineering
关键词
高温高压
强侵入
毛管压力
非电法
饱和度评价
high temperature and high pressure
strong invasion
capillary pressure
non-electrical method
saturation evaluation
