瞬时子波吸收分析技术的应用——以中国近海天然气检测为例
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摘要
基于地震波在通过含气地层时高频成分衰减剧烈这一性质,通过分析高频成分的频谱可以对储层含气性进行检测。常规吸收分析技术是在地震道上分时窗直接进行频谱分析,分析结果受反射系数的影响较大,难以区分强振幅异常是由地层含气引起还是由高阻岩性引起。基于地震资料相对保幅处理的瞬时子波吸收分析技术,能在复赛谱中实现地震子波和反射系数的分离,排除了反射系数的影响,使分析精度得到很大提高。将该技术应用于中国近海多个海域的天然气检测,其结果与钻探结果相吻合。依据分析结果,进行了有利勘探区预测。
Based on the characteristic that high frequency component of seismic wave was seriously attenuated when going through gasbearing formation,we can detect the gas-bearing property of reservoir by analyzing the frequency spectrum of high-frequency component. Frequency spectrum analysis is carried out directly in divided time window on seismic traces in conventional absorption analysis technique,but the analysis results are seriously influenced by reflection coefficient,strong amplitude anomaly is difficult to be distinguished whether caused by the gas-bearing or high-impedance of formation.Based on instantaneous wavelet absorption analysis technique for relative amplitude preservation on seismic data,the seismic wavelet and reflection coefficient can be separated in cepstrum, which excludes the impact of reflection coefficient and greatly improves the analysis accuracy.The technique was applied to several offshore exploration areas in China,the result of gas detection coincided with drilling data.The potential exploration area was pre dicted in terms of the analysis results.
Based on the characteristic that high frequency component of seismic wave was seriously attenuated when going through gasbearing formation,we can detect the gas-bearing property of reservoir by analyzing the frequency spectrum of high-frequency component. Frequency spectrum analysis is carried out directly in divided time window on seismic traces in conventional absorption analysis technique,but the analysis results are seriously influenced by reflection coefficient,strong amplitude anomaly is difficult to be distinguished whether caused by the gas-bearing or high-impedance of formation.Based on instantaneous wavelet absorption analysis technique for relative amplitude preservation on seismic data,the seismic wavelet and reflection coefficient can be separated in cepstrum, which excludes the impact of reflection coefficient and greatly improves the analysis accuracy.The technique was applied to several offshore exploration areas in China,the result of gas detection coincided with drilling data.The potential exploration area was pre dicted in terms of the analysis results.
引文
1赵正璋,赵贤正,王英明,等.储层地震预测理论与实践[M].北京:科学出版社,2005.1-423
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6 Lichman E,Goloshubin G.Unified approach to gas and fluid detection on instantaneous seismic wavelets[J]. Expanded Abstracts of 73~(rd) Annual Internat SEG Mtg, 2003,1 699-1 702
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9胡贤根,尚新民,石林光.等.基于叠前时间偏移资料的AVO处理技术[J].石油物探,2002,41(3):343-346
10王宏语,赵全国.瞬时子波吸收分析技术在复杂地区的应用——以吐哈盆地鄯勒地区为例[J].天然气地球科学,2007,18(2):289-292
11李绪宣.莺歌海盆地浅层天然气藏的地震识别技术研究[J].中国海上油气(地质),2000,14(3):193-199
12张益明,张文,范廷恩.多种地震属性分析技术在LD20-1构造区储层预测和含气性检测中的应用[J].中国海上油气(工程),2005,17(3):167-170
13李绪宣,李维新,张益明,等.琼东南盆地天然气成藏特征及地震识别技术[J].中国海上油气(工程),2006, 18(2):79-86
14穆东海,夏庆龙,颜志华.渤海海域AVO技术应用效果分析——以JZ31-1构造为例[J].中国海上油气(地质),2003,17(6):401-406
2夏红敏,王尚旭,李杰生.含气地层的AVO响应分析[J].石油物探,2006,45(4):357-361
3甘利灯,赵帮六,杜文辉,等.弹性阻抗在岩性与流体预测中的潜力分析[J].石油物探,2005,44(5):504-508
4管路平.地震叠前反演与直接烃类指示的探讨[J].石油物探,2008,47(3):228-234
5李显贵,徐天吉,甘其刚.新场气田须家河气藏含气性地震检测研究[J].石油物探,2006,45(2):186-191
6 Lichman E,Goloshubin G.Unified approach to gas and fluid detection on instantaneous seismic wavelets[J]. Expanded Abstracts of 73~(rd) Annual Internat SEG Mtg, 2003,1 699-1 702
7 Mitchell J T,Derzhi N,Lichman E,et al.Energy absorption analysis:a case study[J].Expanded Abstracts of 66~(th) Annual Internat SEG Mtg,1996,1 785-1 788
8陈习峰,毛树礼.基于瞬时子波吸收分析的油气检测方法[J].小型油气藏,2007,12(2):29-31
9胡贤根,尚新民,石林光.等.基于叠前时间偏移资料的AVO处理技术[J].石油物探,2002,41(3):343-346
10王宏语,赵全国.瞬时子波吸收分析技术在复杂地区的应用——以吐哈盆地鄯勒地区为例[J].天然气地球科学,2007,18(2):289-292
11李绪宣.莺歌海盆地浅层天然气藏的地震识别技术研究[J].中国海上油气(地质),2000,14(3):193-199
12张益明,张文,范廷恩.多种地震属性分析技术在LD20-1构造区储层预测和含气性检测中的应用[J].中国海上油气(工程),2005,17(3):167-170
13李绪宣,李维新,张益明,等.琼东南盆地天然气成藏特征及地震识别技术[J].中国海上油气(工程),2006, 18(2):79-86
14穆东海,夏庆龙,颜志华.渤海海域AVO技术应用效果分析——以JZ31-1构造为例[J].中国海上油气(地质),2003,17(6):401-406
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