利用全波属性参数识别川西深层致密气藏
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摘要
四川新场地区须家河组气藏构造复杂、储层埋深大(约5000m)、物性差、非均质性和隐蔽性强,气藏存在纵波"杂乱弱反射"、横波连续强反射,纵、横波均为"杂乱弱反射"和纵、横波都为连续反射等地震响应特征。本文基于四川新场地区三维三分量地震资料,采用吸收及速度发散分析,双相介质吸收预测,多尺度吸收属性提取,频变特性分析,弹性阻抗系数反演,纵、横波叠前联合反演,纵、横波叠后联合反演等技术,开展了全波属性研究。全波属性含气性检测方法综合利用了纵、横波属性及纵、横波联合直接计算与间接衍生的多波属性,基于全波敏感性分析、多体交会解释,充分地发挥了全波属性信息量大、地质信息丰富的优势,可为隐蔽性强、常规方法难以奏效的非常规油气藏预测提供新的思路。
Gas reservoirs in Xinchang Gas field,Western Sichuan Depression have some tough geologic conditions with complex structure,deep burying(about 5000m),strong anisotropy and strong concealment.For seismic response,sometimes P wave reflection is disordered and weak,and sometimes both P wave and S wave reflection are disordered and weak.Thank to 3D3C seismic data in the area,we utilize full-wave attributes to identify deep tight gas reservoirs by using some techniques including analysis of absorption and velocity dispersion,absorption prediction of tow-phase media,extraction of multi-scale absorption,analysis of frequency-dependent characters,elastic impedance coefficient inversion,pre-stack P and S wave joint inversion,post-stack P and S wave joint inversion.Full-wave attributes gas detection are carried out by P and S wave attributes and multi-wave attributes.With the help of interactive interpretation of multi-data and more geophysical and geological information,this technique provides a new way for unconventional gas reservoir detection.
Gas reservoirs in Xinchang Gas field,Western Sichuan Depression have some tough geologic conditions with complex structure,deep burying(about 5000m),strong anisotropy and strong concealment.For seismic response,sometimes P wave reflection is disordered and weak,and sometimes both P wave and S wave reflection are disordered and weak.Thank to 3D3C seismic data in the area,we utilize full-wave attributes to identify deep tight gas reservoirs by using some techniques including analysis of absorption and velocity dispersion,absorption prediction of tow-phase media,extraction of multi-scale absorption,analysis of frequency-dependent characters,elastic impedance coefficient inversion,pre-stack P and S wave joint inversion,post-stack P and S wave joint inversion.Full-wave attributes gas detection are carried out by P and S wave attributes and multi-wave attributes.With the help of interactive interpretation of multi-data and more geophysical and geological information,this technique provides a new way for unconventional gas reservoir detection.
引文
[1]Aki K and Richards P G.Quantitative Seismology.WH Freeman Co,1980
[2]唐建明,杨军,张哨楠.川西坳陷中、浅层气藏储层识别技术.石油与天然气地质,2006,27(6):879～894Tang Jian-ming,Yang Jun,Zhang Shao-nan.Recogni-tion of shallow-middle gas reservoirs in western Si-chuan depression.Oil&Gas Geology,2006,27(6):879～894
[3]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.石油物探,2006,45(2):186～191Li Xian-gui,Xu Tian-ji,Gan Qi-gang.Seismic gasbearing detection in T_3xgas reservoirs in XinchangGas Field.GPP,2006,45(2):186～191
[4]徐天吉,程冰洁,李显贵.频率与多尺度吸收属性应用研究——以川西坳陷深层气藏预测为例.石油物探,2009,48(4):390～395Xu Tian-ji,Cheng Bing-jie,Li Xian-gui.Applicationof frequency and multi-scale absorption attribute ofdeep formation in Western Sichuan Depression.GPP,2009,48(4):390～395
[5]Castagna J P,Sun Shen-jie,Siegfried R W.Instanta-neous spectral analysis:detection of low-frequencyshadows associated with hydrocarbons.The LeadingEdge,2003,22(2):120～127
[6]Odebeatu E,Zhang Jing-hua,Chapman M et al.Ap-plication of spectral decomposition to detection of dis-persion anomalies associated with gas saturation.TheLeading Edge,2006,25(2):206～210
[7]Cao Hong,Yang Zhi-fang and Li Yong-gen.Elasticimpedance coefficient(EC)for lithology discriminationand gas detection.SEG Technical Program Expand-ed Abstracts,2008,27:1526～1530
[8]Cai Xi-yuan et al.Research and application of gas de-tection techniques using full-wave attributes in south-west China.First Break,2009,27(11):79～84
[2]唐建明,杨军,张哨楠.川西坳陷中、浅层气藏储层识别技术.石油与天然气地质,2006,27(6):879～894Tang Jian-ming,Yang Jun,Zhang Shao-nan.Recogni-tion of shallow-middle gas reservoirs in western Si-chuan depression.Oil&Gas Geology,2006,27(6):879～894
[3]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.石油物探,2006,45(2):186～191Li Xian-gui,Xu Tian-ji,Gan Qi-gang.Seismic gasbearing detection in T_3xgas reservoirs in XinchangGas Field.GPP,2006,45(2):186～191
[4]徐天吉,程冰洁,李显贵.频率与多尺度吸收属性应用研究——以川西坳陷深层气藏预测为例.石油物探,2009,48(4):390～395Xu Tian-ji,Cheng Bing-jie,Li Xian-gui.Applicationof frequency and multi-scale absorption attribute ofdeep formation in Western Sichuan Depression.GPP,2009,48(4):390～395
[5]Castagna J P,Sun Shen-jie,Siegfried R W.Instanta-neous spectral analysis:detection of low-frequencyshadows associated with hydrocarbons.The LeadingEdge,2003,22(2):120～127
[6]Odebeatu E,Zhang Jing-hua,Chapman M et al.Ap-plication of spectral decomposition to detection of dis-persion anomalies associated with gas saturation.TheLeading Edge,2006,25(2):206～210
[7]Cao Hong,Yang Zhi-fang and Li Yong-gen.Elasticimpedance coefficient(EC)for lithology discriminationand gas detection.SEG Technical Program Expand-ed Abstracts,2008,27:1526～1530
[8]Cai Xi-yuan et al.Research and application of gas de-tection techniques using full-wave attributes in south-west China.First Break,2009,27(11):79～84
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