叠前地震属性技术在低渗透气藏勘探中的应用
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摘要
鄂尔多斯盆地上古生界盒8段气藏属典型的低孔低渗砂岩岩性气藏,储层段物性及含气性在横向上存在着严重的非均质性,常规叠后技术很难对其进行准确的预测。针对这一难点问题,在叠前处理资料的基础上,利用地震道集、近中远叠加剖面、叠前角度域烃类检测、弹性参数反演等叠前属性技术,提出了一套对苏里格气田盒8段储层进行含气性预测的有效方法并在实践中取得了良好效果。
Gas reservoir in the 8 member of Shihezi Formation in upper Paleozoic in Ordos basin is a typical lithologic reservoir with low-porosity and low-permeability.The physical property of gas reservoir and gas-bearing quality is horizontally anisotropic.It is difficult to predict the sand reservoir distribution by means of normal post-stack technique.Based on pre-stack data,we used seismic trace gather,close-medium-far superimposed section,pre-stack angle domain hydrocarbon detection and elastic parameter inversion to predict the gas-bearing quality in the 8 Member of Shihezi Formation,Sulige gas field.The practical test has proved that it is effective.
Gas reservoir in the 8 member of Shihezi Formation in upper Paleozoic in Ordos basin is a typical lithologic reservoir with low-porosity and low-permeability.The physical property of gas reservoir and gas-bearing quality is horizontally anisotropic.It is difficult to predict the sand reservoir distribution by means of normal post-stack technique.Based on pre-stack data,we used seismic trace gather,close-medium-far superimposed section,pre-stack angle domain hydrocarbon detection and elastic parameter inversion to predict the gas-bearing quality in the 8 Member of Shihezi Formation,Sulige gas field.The practical test has proved that it is effective.
引文
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[2]Shi Songqun,Zhao Yuhua.Research on gas-bearing predictionusing AVO in sandstone reservoir with low-impedance,Suligegas field[J].Oil Geophysical Prospecting,2003,28(1):77-83.[史松群,赵玉华.苏里格气田低阻砂岩储层的含气性预测研究[J].石油地球物理勘探,2003,28(1):77-83.]
[3]Wang Daxing,Yu Bo,Zhang Mengbo,et al.Reservoir predic-tion method on prestack seismic data[J].Natural Gas Indus-try,2007,27(supplement):314-317.[王大兴,于波,张盟勃,等.地震叠前储层预测方法[J].天然气工业,2007,27(增刊):314-317.]
[4]Zhang Qiaofeng,Wang Yuqing,Wang Tianqi.Seismic predic-tion technique of thin interbed channel sand in Songliao basin[J].Lithologic Reservoirs,2007,19(1):92-95.[张巧凤,王余庆,王天琦.松辽盆地薄互层河道砂岩地震预测技术[J].岩性油气藏,2007,19(1):92-95.]
[5]Liu Weihua,Gao Jianhu,Chen Qiyan,et al.Application of Res-ervoir Prediction Research Based on Logging-RockphysicsStudy[C].Beijing:Chinese Petroleum Society to the 2008 In-ternational Conference on Technology,2008:493-496.[刘卫华,高建虎,陈启艳,等.基于测井资料的岩石物理分析在储层预测研究中的应用[C].北京:中国石油学会2008年物探技术研讨会论文集,2008:493-496.]
[6]Yue Youxi,Yang Li.Basic theories and methods of seismic res-ervoir prediction[J].Natural Gas Geoscience,2009,20(4):563-570.[乐友喜,杨丽.储层地震预测基础理论方法研究[J].天然气地球科学,2009,20(4):563-570.]
[7]Castagna J P,Batzle M L,Kan T K.Rock physics—the link be-tween rock properties and AVO response[M]//Castagna J P,Backus M M.Offset-dependent Reflectivity—Theory and Prac-tice of AVO Analysis:Investigations in Geophysics.Society ofExploration Geophysicists,1993:135-171.
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