地震技术在煤层气储层研究与物性预测中的应用
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摘要
随着我国对煤层气勘探开发的重视,煤层气储层的研究也越来越重要,特别是对煤层气储层内部结构特征的精细描述和刻画,以及对煤储层的含气性和渗透性预测,已成为研究的热点问题。由于煤层气藏自身所具有的独特特征,使得常规物理勘探方法难以对煤层气储层进行有效的研究,而地震技术则显示出其巨大优势。如利用地震技术解释煤储层构造;地震属性分析的方法研究薄煤层厚度;叠前AVO反演技术、叠前弹性阻抗(EI)反演技术和叠后波阻抗(AI)反演技术对煤储层含气性的预测;叠前方位AVO反演技术和地震反射层的曲率属性分析技术对煤储层渗透性的预测。经研究及实践表明,地震技术在煤储层研究中的效果明显。
As China is focusing on CBM,it is becoming more and more important to research CBM-reservoir,particularly in the aspects of fine description of internal reservoir and prediction of gas-bearing properties and permeability.Due to unique characteristics of CBM-reservoir,conventional physical exploration is not very effective;however,the seismic techniques reveal a huge advantage.For example,seismic interprets the structure of CBM-reservoir and can tell the thickness of thin coal beds,and predict gas-bearing properties of CBM-reservoir by means of pre-stack AVO conversion,pre-stack elastic impedance(EI) conversion,and post-stack acoustic impedance(AI) conversion,and predict permeability of CBM-reservoir by means of pre-stack direction AVO conversion and analyze curvature properties of seismic reflection stratum.The research results indicate that seismic techniques applied to CBM reservoirs have an obvious effect.
As China is focusing on CBM,it is becoming more and more important to research CBM-reservoir,particularly in the aspects of fine description of internal reservoir and prediction of gas-bearing properties and permeability.Due to unique characteristics of CBM-reservoir,conventional physical exploration is not very effective;however,the seismic techniques reveal a huge advantage.For example,seismic interprets the structure of CBM-reservoir and can tell the thickness of thin coal beds,and predict gas-bearing properties of CBM-reservoir by means of pre-stack AVO conversion,pre-stack elastic impedance(EI) conversion,and post-stack acoustic impedance(AI) conversion,and predict permeability of CBM-reservoir by means of pre-stack direction AVO conversion and analyze curvature properties of seismic reflection stratum.The research results indicate that seismic techniques applied to CBM reservoirs have an obvious effect.
引文
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[11]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[J].地球物理学报,2005,48(16):1475-1485
[12]Connolly P.E lastic impedance[J].The Lead ing Edge,1999,18(4):438-452
[13]彭晓波,彭苏萍,詹阁.P波方位AVO在煤层裂缝探测中的应用[J].岩石力学与工程学报,2005,24(16):2960-2965
[14]刘咸卫,曹运兴,刘瑞,等.正断层两盘的瓦斯突出分布特征及其地质成因浅析[J].煤炭学报,2000,25(6):571-575
[2]刘贻军,娄建青.中国煤层气储层特征及开发技术探讨[J].天然气工业,2004,24(1):68-71
[3]常锁亮,刘大锰,王明寿.煤层气勘探开发中地震勘探技术的作用及应用方法探讨[J].中国煤层气,2008,5(2):23-27
[4]常锁亮.沁水盆地南部煤层气储层物性预测的地震技术研究与应用[D].北京:中国地质大学,2008
[5]琚易文,候泉林,姜波,等.构造煤结构与储层物性[R].2006第六届国际煤层气研讨会,2006:32-27
[6]彭苏萍,杜文凤,苑春方,等.不同结构类型煤体地球物理特征差异分析和纵横波联合识别与预测方法研究[J].地质学报,2008,82(10):1311-1321
[7]孙渊,张良,朱军,等.地震属性参数在煤层厚度预测中的应用[J].煤田地质与勘探,2008,36(4):58-60
[8]胡宗正,郭良红,林建东.三维地震属性参数在煤层厚度预测中的应用[J].中国煤炭地质,2008,20(6):56-58
[9]董守华.煤弹性各向异性系数测试与P波方位各向异性裂缝评价技术[D].徐州:中国矿业大学,2004
[10]常锁亮,杨起,刘大锰,等.煤层气储层物性预测的AVO技术对地震纵波资料品质要求的探讨[J].地球物理学进展,2008,23(4):7320-3421
[11]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[J].地球物理学报,2005,48(16):1475-1485
[12]Connolly P.E lastic impedance[J].The Lead ing Edge,1999,18(4):438-452
[13]彭晓波,彭苏萍,詹阁.P波方位AVO在煤层裂缝探测中的应用[J].岩石力学与工程学报,2005,24(16):2960-2965
[14]刘咸卫,曹运兴,刘瑞,等.正断层两盘的瓦斯突出分布特征及其地质成因浅析[J].煤炭学报,2000,25(6):571-575
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