储层条件下气-水和油-水互驱地震岩石物理实验研究  

Seismic rock physical experiment on the porous fluid replacement at reservoir conditions

作　　者：裴发根[1] 方慧[1] 杜炳锐[1] 邹长春[2] 史謌[3] 

机构地区：[1]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000 [2]中国地质大学(北京)地下信息探测技术与仪器教育部重点实验室,北京100083 [3]北京大学地球与空间科学学院,北京100871

出　　处：《石油物探》2013年第6期559-565,1,共7页Geophysical Prospecting For Petroleum

基　　金：教育部科学技术研究重点项目(109035);国家自然科学重点基金项目(40830423);"斯伦贝谢大学生课外科技研究计划"重点项目(SLBX0908)共同资助

摘　　要：针对影响岩石波速的主要因素——不同孔隙流体,展开了储层条件下气-水和油-水互驱地震岩石物理实验研究。在模拟储层温度、压力条件下,对取自南海的砂岩岩样进行了不同含水饱和度的气-水和油-水互驱波速测量实验,获得了不同状态下的纵、横波波速,得到了不同气-水、油-水条件下的弹性参数变化规律。实验表明:①在气-水驱替过程中,纵波速度vP随着含水饱和度Sw的增大呈缓慢增长趋势,当含水饱和度达到80%后,vP增长较快;②在水驱油过程中,vP随着含油饱和度的增加而减小,且实验波速值与经典的Biot-Gassmann理论值两者吻合较好;③气-水驱替过程中,vP/vS对不同含水饱和度的孔隙流体反映较为灵敏,通过泊松比σ与体积模量K交会分析可以较好地分离饱气与饱水岩样;④水驱油过程中,泊松比σ、拉梅常数λ和流体敏感因子F等参数对不同含水饱和度(含油饱和度)的孔隙流体反映较为敏感,利用λ-F交会图可以区分饱水和饱油岩样。这些实验结果为利用叠前地震属性进行油气检测提供了有利依据。Different porous fluid is the main factor impacting the acoustic velocity of rock.In terms of this recognition,we carried out seismic rock physical experiment at reservoir conditions including gas-water and oil-water replacement.The wave velocity experiment of sand rock samples taken from the South China Sea in different gas-water and oil-water systems under simulated temperature and pressure conditions is studied.Some parameters were obtained,including vP,vS and the variation law of the elastic parameters in different gaswater and oil-water conditions.The results indicate:①In the gaswater replacement experiment,vP grows slowly along with the Sw increases.When the Sw >80%,vP grows faster;②In the oil-water replacement experiment,vP decreases with the So increases,and the experimental acoustic velocity coincides with that of classic BiotGassmann theory;③In the gas-water replacement experiment,the vP/vS reflects more sensitively to different content of water saturation,both the gas-saturated samples and water-saturated samples would be separated by the crossplot of K-σ;④In the oil-water replacement experiment,some parameters includingσ,λand F are more sensitively to the different content of water saturation(oil saturation),both the oil-saturated samples and water-saturated samples would be separated by the crossplot ofλ-F.These results can be used to detect oil and gas in prestack seismic attribute analysis.

关 键 词：岩石物理实验 纵、横波波速 孔隙流体 交会图 

分 类 号：P631.4[天文地球—地质矿产勘探]