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1、第48卷第6期地球物理学报Vol.48,No.62005年11月CHINESEJOURNALOFGEOPHYSICSNov.,2005彭苏萍,高云峰,杨瑞召等.AVO探测煤层瓦斯富集的理论探讨和初步实践)以淮南煤田为例.地球物理学报,2005,48(6):1475~1486PengSP,GaoYF,YangRZ,etal.TheoryandapplicationofAVOfordetectionofcoalbedmethane)AcasefromtheHuainancoalfield.Chinese
2、J.Geophys.(inChinese),2005,48(6):1475~1486AVO探测煤层瓦斯富集的理论探讨和初步实践)))以淮南煤田为例彭苏萍,高云峰,杨瑞召,陈华靖,陈信平中国矿业大学资源与安全工程学院,北京100083摘要以煤层瓦斯富集地质理论为基础,根据煤层瓦斯与常规砂岩储层天然气赋存机理的对比,提出了以煤层割理裂隙为探测目标的煤层瓦斯富集AVO技术预测理论.根据AVO理论模拟,煤层顶面反射振幅通常是随着炮检距的增大而减小;不同结构煤体在AVO响应上存在明显的差异,随着煤层割理裂隙发
3、育程度的增强,煤层顶面AVO的截距和梯度都会增大;煤层厚度的调谐作用对其AVO特征有明显的影响.通过对淮南煤田实际地震资料的处理和分析,探讨了煤田地震资料AVO的处理和解释方法,认为AVO梯度和伪泊松比反射系数是对煤层割理裂隙发育程度最为敏感的属性,获得了研究区内有工程使用价值的瓦斯突出区预测成果,初步证实了应用AVO技术检测煤层割理裂隙、预测煤层瓦斯富集部位的可行性.关键词AVO,含煤地层,瓦斯富集,淮南煤田文章编号0001-5733(2005)06-1475-12中图分类号P631收稿日期200
4、4-11-22,2005-08-30收修定稿TheoryandapplicationofAVOfordetectionofcoalbedmethane)))AcasefromtheHuainancoalfieldPENGSu_Ping,GAOYun_Feng,YANGRui_Zhao,CHENHua_Jing,CHENXin_PingSchoolofSafetyandResourceEngineering,ChinaUniversityofMiningandTechnology,Beijing100
5、083,ChinaAbstractBasedonthegeologicaltheoryofcoalbedmethaneaccumulationandcontrastbetweenthepreservingmechanismofmethaneincoalbedsandthatofnaturalgasinsandstonereservoirs,weproposeatheoryfordetectingmethaneaccumulationtargetingatcleatsandfracturesincoa
6、lbedwiththeAVOtechnique.AccordingtoAVOmodeling,amplitudesofthecoalbedtopinterfacedecreasewiththeoffsetincreasing.TheAVOresponsesofcoalofdifferentstructuresareconsiderablydifferent.Bothinterceptandgradientonthecoalbedtopinterfaceincreasewiththedensityof
7、cleatsandfracturesincreasing.ItalsoshowsthatthetuningeffectofcoalbedthicknesscanimpairitsAVOresponse.ThentheAVOtechniqueispracticedintheHuainancoalfield,andmethodsforseismicdataAVOprocessionandinterpretationarestudied.TheresultshowsthatAVOattributessuc
8、hasgradientandpseudoPoisson.sratioreflectirityaresensitivetogasaccumulationanddensityofcleatsandfracturesincoalbeds.DangerouszoneswithmethaneaccumulationinthestudyareahavebeenpredictedaccordingAVOanomalies.Andtheresultisofengineeringval
