鄂尔多斯盆地苏里格气田地震转换波解释  

SEISMIC CONVERTED WAVE INTERPRETATION FOR SULIGE GAS FIELD,ORDOS BASIN

作　　者：郭晓龙[1] 欧阳永林[1] 耿晶[1] 许晶[2] 

机构地区：[1]中国石油勘探开发研究院廊坊分院,河北廊坊065007 [2]华北油田分公司,河北任丘062552

出　　处：《天然气地球科学》2005年第5期650-653,共4页Natural Gas Geoscience

基　　金：中国石油天然气股份公司勘探与生产分公司2004年度科研项目"地球物理综合信息直接识别储层与油气检测方法研究"(编号:0401143)资助

摘　　要：钻井表明高能水道的分布是控制苏里格气田有效储层分布的最主要因素。指出由于高能水道沉积的粗砂岩具有较高的横波速度,且与泥岩的横波速度差较大,使得转换波剖面出现较强的反射振幅,故利用转换波资料可以很好地刻画高能水道的分布,这是在苏里格气田利用多波多分量解释气层最为重要的基础。利用模型证明含气砂岩和泥岩的转换波反射系数是致密砂岩和泥岩反射系数的4倍左右,同时还证明在苏里格地区纵波和转换波具有180°的相位差,认为在解释时应把转换波剖面相位调整到和纵波剖面一致,这样解释的结果与井的吻合度较高。Drilling in Sulige gas field shows that the distribution law of high-energy water way in this field is the most important element to control effective reservoir distribution. Sedimentary coarse sandstone of high-energy water way has higher shear velocity, which has clear contrast to the shear velocity of shale, and makes the converted wave profile to show higher reflection amplitude. This is the most important basement to interpret gas reservoir with multiple and multicomponent. Utilizing model in this article proves that the converted wave reflection coefficient for gas-bearing sand and shale is about 4 times to the reflection coefficient for fine sand and shale. The model also shows that the longitudinal wave and converted wave have 180° phase difference at the area of Sulige. The phase for the converted wave profile should be consistent with that for the longitudinal wave profile during interpreting. Thus the consistent degree between the interpreting result and well is better.

关 键 词：转换波 转换波反射系数 转换波剖面 转换波解释 

分 类 号：P631.4[天文地球—地质矿产勘探]