正交偶极声波测井在鄂尔多斯盆地变质岩储层中的应用  

Application of Dipole Acoustic Log in Metamorphic Rock Reservoirs in Erdos Basin

作　　者：李国军 孙灵芬[2] 廖鸿龙[2] 张国华 

机构地区：[1]中海油服油田技术事业部,北京101149 [2]中石化中原油田测井公司,河南濮阳457001

出　　处：《测井技术》2007年第4期357-359,共3页Well Logging Technology

摘　　要：结合电成像资料深入研究正交偶极声波资料在鄂尔多斯盆地变质岩裂缝发育井段的特征,分析了由于快慢横波分离指示的各向异性在致密地层和裂缝发育地层不同的应用效果。确定了鄂尔多斯盆地变质岩裂缝性含气层的纵横波速度比小于1.65,并认定其岩性以轻变质碎屑岩为主;利用斯通利里波反射系数结合声波波形变密度图像来评价裂缝和裂缝开度;利用纵波、横波、斯通利波的能量判断裂缝发育带;分析出地层裂缝系统的走向为东西向。解决了变质岩裂缝性储层评价及流体识别的技术难题,取得了较明显的效果。试气发现了气层。此外,利用此声波测井资料计算的岩石力学参数为合理选择钻井泥浆比重,判别井眼垮塌层段提供了依据。In integrated evaluation and liquid identification of mesoproterozoic metamorphic rock reservoirs, Erdos Basin, by orthogonal dipole acoustic logs solved are following problems： the velocity ratios of compressional to shear wave are less than 1.65 in the reservoirs, the lithologies of the reservoirs are dominated by light metamorphic detrital rock; using Stoneley wave reflect coefficient combining acoustic wave shape variable-density image to evaluate fracture and fracture expanded degree; estimation of fracture growth zone with the energy of compressional, shear and Stoneley waves; the direction of the formation fracture system is concluded as west-east. These cognitions are helpful in discovering gas zones in well tests. Besides, rock mechanics parameters calculated on the acoustic data provide a base for rationally choosing mud density and identifying borehole collapse.

关 键 词：偶极声波测井 气层识别 斯通利波 地层各向异性 最大水平应力 变质岩 

分 类 号：P631.52[天文地球—地质矿产勘探]