瓦斯含量对煤层物性参数及AVO响应特征的影响研究
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摘要
煤的孔隙度一般较小,低于5%,且被水充满,游离气和溶解气甚少,主要是吸附气,因此,无法利用测井方法直接判断煤层中是否含气。本文在流体替换原理基础上,分析了不同含气饱和度对煤层纵、横波速度和密度等物性参数的影响,并建立了不同含气饱和度煤储层地质模型,对纵波反射波(P-P波)和纵波转换波(P-S波)的AVO特征进行了数值模拟和分析,认为综合利用P-P波和P-S波AVO信息,可以判断煤层中是否含气,对煤层气的勘探开发具有一定参考作用。
The porosity of coal seam is very low(generally less than 5%),and the pore is filled with water, the free gas and dissolved gas are very little, mainly adsorbed gas. Therefore, the logging method can not be used to directly determine whether the coal seam is gas bearing. In this paper, based on the fluid replacement theory, the effect of different gas saturation on the parameters of the longitudinal, shear wave velocity and density of the coal seam are analyzed, and the model of gas coal seam was established, meanwhile, the AVO characteristic curve and wave field characteristics of P-P wave and P-S wave are simulated and analyzed. The comprehensive utilization of P-P and P-S wave AVO information can whether the coal seam is gas bearing, Which has certain reference function to the exploration and development of coal bed gas.
The porosity of coal seam is very low(generally less than 5%),and the pore is filled with water, the free gas and dissolved gas are very little, mainly adsorbed gas. Therefore, the logging method can not be used to directly determine whether the coal seam is gas bearing. In this paper, based on the fluid replacement theory, the effect of different gas saturation on the parameters of the longitudinal, shear wave velocity and density of the coal seam are analyzed, and the model of gas coal seam was established, meanwhile, the AVO characteristic curve and wave field characteristics of P-P wave and P-S wave are simulated and analyzed. The comprehensive utilization of P-P and P-S wave AVO information can whether the coal seam is gas bearing, Which has certain reference function to the exploration and development of coal bed gas.
引文
[1]汪恩华,贺振华,李庆中.基于薄层的反射系数谱理论与模型正演[J].成都理工学院学报,2007,28(1):70-74.
[2]王云专,孙立志,任晓乔.储层参数对多波AVO的影响[J].中国海上油气(地质),2003,17(4):12-33.
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[5]姜鑫,田瑞,苏猛.煤堆场防风抑尘网数值模拟及分析[J].煤炭技术,2014,33(2):154-157.
[6]孙鹏远,孙建国,李彦鹏等.P-SV波AVO响应特征分析.石油地球物理勘探[J],2005,40(40):34-37.
[7]辛广柱,刘赫,彭建亮等.地质因素和资料因素对地震属性的影响[J].岩性油气藏,2007,19(1):105-108.
[2]王云专,孙立志,任晓乔.储层参数对多波AVO的影响[J].中国海上油气(地质),2003,17(4):12-33.
[3]王建华.叠前弹性参数反演新方法[J].2006(4):49-53.
[4]陆基孟.地震勘探原理[M].石油大学出版社.1993年8月第一版:23-24.
[5]姜鑫,田瑞,苏猛.煤堆场防风抑尘网数值模拟及分析[J].煤炭技术,2014,33(2):154-157.
[6]孙鹏远,孙建国,李彦鹏等.P-SV波AVO响应特征分析.石油地球物理勘探[J],2005,40(40):34-37.
[7]辛广柱,刘赫,彭建亮等.地质因素和资料因素对地震属性的影响[J].岩性油气藏,2007,19(1):105-108.