分频AVO技术在珠江口盆地番禺天然气区含气性分析中的应用
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摘要
AVO理论在实际应用中与实际地层条件存在较大差异,导致这种差异的一个主要原因在于薄层调谐效应改变了地震AVO变化规律。珠江口盆地番禺流花气区G圈闭内的A井SB21.0含气砂岩钻前烃类检测结论与钻后AVO模型正演研究结论不符,并且该区含水砂岩与含气砂岩的AVO地震响应特征相同。因此利用叠前道集判断储层流体性质出现误区,使B井钻探失利。为解决该区在应用AVO技术中存在的"陷阱",利用不同频率范围的吸收与衰减引起的地震振幅差异,在G圈闭开展不同频带的分频AVO属性研究工作。研究结果表明:分频AVO技术能有效地解决该区储层AVO响应井震不一致的问题。将这一技术应用于预测有利目标,结果表明预测结果正确。
In this paper it is founded out that applying AVO theory to field data leads to a great difference with real geological strata,the main reason for the difference lies on the fact that the thin layer tuning effect modified the seismic AVO changing rule.The pre-drilling hydrocarbon detection conclusion for A well gas-bearing sandstone in Liuhua gas area G trap in Fanyu natural gas area in Pearl River Mouth Basin and pro-drilling AVO forward modeling study conclusion do not match with each other,and moreover the AVO seismic responses for water-bearing sandstone and the gas-bearing sandstone in this area are even the same,all the results above indicate that using pre-stack seismic gathers to predict fluid type lead to the wrong conclusion,then finally resulting in B well's drilling to fail.In order to avoid pitfall in application of AVO technique in this area,the seismic amplitude differences which were caused by absorption and attenuation for different frequency range were analyzed and utilized,the studies on frequency division AVO attribute for different frequency bands were conducted for G trap.The results show that frequency division AVO technique can effectively resolve the inconsistence problem for the reservoir AVO well-to-seismic responses,and then technique was applied in predicting favorite geological objects,and finally the correct prediction results were obtained.
In this paper it is founded out that applying AVO theory to field data leads to a great difference with real geological strata,the main reason for the difference lies on the fact that the thin layer tuning effect modified the seismic AVO changing rule.The pre-drilling hydrocarbon detection conclusion for A well gas-bearing sandstone in Liuhua gas area G trap in Fanyu natural gas area in Pearl River Mouth Basin and pro-drilling AVO forward modeling study conclusion do not match with each other,and moreover the AVO seismic responses for water-bearing sandstone and the gas-bearing sandstone in this area are even the same,all the results above indicate that using pre-stack seismic gathers to predict fluid type lead to the wrong conclusion,then finally resulting in B well's drilling to fail.In order to avoid pitfall in application of AVO technique in this area,the seismic amplitude differences which were caused by absorption and attenuation for different frequency range were analyzed and utilized,the studies on frequency division AVO attribute for different frequency bands were conducted for G trap.The results show that frequency division AVO technique can effectively resolve the inconsistence problem for the reservoir AVO well-to-seismic responses,and then technique was applied in predicting favorite geological objects,and finally the correct prediction results were obtained.
引文
[1]殷八斤,曾灏,杨在岩.AVO技术的理论和实践.北京:石油工业出版社,1995
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[4]雍扬.TI介质多波AVA方程及参数反演.石油物探,2004,44(1):11～16
[5]孟宪军,姜秀娣.叠前AVA广义非线性纵、横波速度反演.石油地球物理勘探,2004,39(6):645～650
[6]乐邵东.AVA裂缝检测技术在川西J M构造中的应用.天然气工业,2004,24(4):22～24
[7]李录明.多波AVA及岩性预测.石油地球物理勘探,1996,31(4):190～204
[8]王卫红,姜在兴,潘仁芳.AVO交会分析及其应用.西安石油学院学报(自然科学版),2003,18(2):5～8
[9]张文,李维新,孙翠娟.AVO交会分析技术的应用.中国海上油气,2002,16(4):286～290
[2]Shuey R T.Asi mplification of the zoeppritz equations.Geophysics,1985,50(4):609～634
[3]何樵登.地震勘探原理和方法.北京:地质出版社,1986
[4]雍扬.TI介质多波AVA方程及参数反演.石油物探,2004,44(1):11～16
[5]孟宪军,姜秀娣.叠前AVA广义非线性纵、横波速度反演.石油地球物理勘探,2004,39(6):645～650
[6]乐邵东.AVA裂缝检测技术在川西J M构造中的应用.天然气工业,2004,24(4):22～24
[7]李录明.多波AVA及岩性预测.石油地球物理勘探,1996,31(4):190～204
[8]王卫红,姜在兴,潘仁芳.AVO交会分析及其应用.西安石油学院学报(自然科学版),2003,18(2):5～8
[9]张文,李维新,孙翠娟.AVO交会分析技术的应用.中国海上油气,2002,16(4):286～290
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