苏里格气田含气储层地震AVO特征
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摘要
苏里格气田为上古生界碎屑岩系中的致密性砂岩气藏,有效的含气储层具有储层薄、横向变化快的特点,因此难以准确预测有效储层的分布.围绕研究区的地质问题以及储层沉积特点,通过AVO模型正演分析,反映出地震道集上的储层AVO特征,并利用叠前地震反演技术提取的各种地震参数,描述地层的岩性和含流体特征.研究表明:本区砂岩储层属于异常特征明显的第三类AVO异常类型,储层属于中低等产能储层;叠前反演得到储层界面的波阻抗差异非常小,纵横波速度和泊松比均为低值;有效地识别出含气储层的分布范围;通过叠前储层描述技术所优选的井位,取得了良好的钻探效果.
Sulige Gasfield is lithologic gas reservoir,which belongs to the clastic rock of the upper Paleozoic.It is very difficult to accurately predict the distribution of effective reservoirs,because the effective reservoirs are thin in thickness and rapid in lateral variation.According to the geological problems and the reservoir feature in Sulige Gasfield,the AVO response on seismic record in the effective reservoirs was obtained using AVO forward modeling method.Several seismic parameters are extracted using pre-stack inversion method and they are used for describing the characteristics of reservoir lithology and fluid.The results show that the sandstone reservoirs have obvious characteristic of the third type of AVO abnormity.The reservoirs are of low-medium productivity.The small wave impedance difference,low ratio of P-wave to S-wave velocity and low Poisson's ratio are shown in seismic interface.The distribution range of the gas-bearing reservoirs is effectively identified by using pre-stack inversion method.The satisfactory drilling exploration result is achieved in the well location optimized by using pre-stack reservoir description technology.
Sulige Gasfield is lithologic gas reservoir,which belongs to the clastic rock of the upper Paleozoic.It is very difficult to accurately predict the distribution of effective reservoirs,because the effective reservoirs are thin in thickness and rapid in lateral variation.According to the geological problems and the reservoir feature in Sulige Gasfield,the AVO response on seismic record in the effective reservoirs was obtained using AVO forward modeling method.Several seismic parameters are extracted using pre-stack inversion method and they are used for describing the characteristics of reservoir lithology and fluid.The results show that the sandstone reservoirs have obvious characteristic of the third type of AVO abnormity.The reservoirs are of low-medium productivity.The small wave impedance difference,low ratio of P-wave to S-wave velocity and low Poisson's ratio are shown in seismic interface.The distribution range of the gas-bearing reservoirs is effectively identified by using pre-stack inversion method.The satisfactory drilling exploration result is achieved in the well location optimized by using pre-stack reservoir description technology.
引文
[1]付锁堂,王大兴,于波.长庆气田榆林区山2段砂岩气藏的AVO分析[J].天然气工业,2000,20(6):24-26.FU Suo-tang,WANG Da-xing,YU Bo.AVO analysis ofthe Shan-2 member sandstone gas reservoir in Yulin regi-om of Changqing Gas Field[J].Natural Gas Industry,2000,20(6):24-26.
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[8]赵卫卫,王秀娟,杨兆林,等.苏里格地区下古生界马家沟组地层水化学特征与天然气聚集关系[J].西安石油大学学报:自然科学版,2012,27(1):35-41ZHAO Wei-wei,WANG Xiu-juan,YANG Zhao-lin,et al.Relationship between hydrochemical characteristics of Ma-jiagou formation water in Lower Paleozoic in Sulige regionand natural gas accumulation[J].Journal of Xi'an ShiyouUniversity:Natural Science Edition,2012,27(1):35-41.
[9]刘昊伟,郑兴远,陈全红,等.华庆地区长6深水沉积低渗透砂岩储层特征[J].西南石油大学学报:自然科学版,2010,32(1):21-26.LIU Hao-wei,ZHENG Xing-yuan,CHEN Quan-hong,etal.Analysis on characteristics of deep-water sedimentarytight sandstone reservoir of Chang 6 in Huaqing area[J].Journal of Southwest Petroleum University:Science&Technology Edition,2010,32(1):21-26.
[10]张新新,赵靖舟,马静辉,等.苏里格气区盒8段地层古今构造特征及其对气水分布的控制作用[J].西安石油大学学报:自然科学版,2011,26(3):14-20.ZHANG Xin-xin,ZHAO Jing-zhou,MA Jing-hui,et al.Ancient and modern tectonic characteristics of 8th memberof Xiashihezi Formation in Sulige Gasfield,Ordos Basin,China and their control effects on gas-water distribution[J].Journal of Xi'an Shiyou University:Natural ScienceEdition,2011,26(3):14-20.
[11]李荣西,段立志,张少妮,等.鄂尔多斯盆地低渗透油气藏形成研究现状与展望[J].地球科学与环境学报,2011,33(4):364-372.LI Rong-xi,DUAN Li-zhi,ZHANG Shao-ni,et al.Reviewon oil/gas accumulation with low permeability in OrdosBasin[J].Journal of Earth Sciences and Environment,2011,33(4):364-372.
[12]Shuey R T.A simplification of the ZoeppritZ equations[J].Geophysics,1985,50(4):609-614.
[2]石玉梅.弹性参数在岩性油气藏勘探中的应用—以苏里格气田为例[J].中国石油勘探,2006(4):80-84.SHI Yu-mei,Application of elastic parameter to explora-tion of lithologic hydrocarbon reservoir in Sulige Gasfield[J].China Petroleum Exploration,2006(4):80-84.
[3]Rutherford S R,Williams R H.Amplitude-versus-offsetvariations in gas sands[J].Geophysics,1989,54(6):680-688.
[4]张盟勃,史松群,潘玉.叠前反演技术在苏里格地区的应用[J].岩性油气藏,2007,1(4):91-94.ZHANG Meng-bo,SHI Song-qun,PAN Yu.Application ofprestack inversion in Sulige area[J].Lithologic Reser-voirs,2007,1(4):91-94.
[5]赵玉华,张盟勃.鄂尔多斯盆地盒8段气藏烃类检测技术研究[J].天然气工业,2005,(5):40-42.ZHAO Yu-hua,ZHANG Meng-bo.Hydrocarbon detectingtechnique of He-8 gas reservoirs in Eerduosi Basin[J].Natural Gas Industry,2005,(5):40-42.
[6]吴志强,丁国栋,李俊华,等.鄂尔多斯盆地上古生界地层AVO技术的应用[J].海洋地质与第四纪地质,2001,20(3):81-86.WU Zhi-qiang,DING Guo-dong,LI Jun-hua,et al.Marineapplication of avo technique to upper Palaeozoic strata inOrdos Basin[J].Eology&Quaternary Geology,2001,20(3):81-86.
[7]丁晓琪,张哨楠,谢世文,等.镇泾地区长8段致密低渗透油藏主控因素分析[J].西南石油大学学报:自然科学版,2011,33(1):25-30.DING Xiao-qi,ZHANG Shao-nan,XIE Shi-wen,et al.Main controlling factors analysis of low permeable tightreservoirs of Chang 8 formation in Zhenjing area[J].Jour-nal of Southwest Petroleum University:Science&Tech-nology Edition,2011,33(1):25-30.
[8]赵卫卫,王秀娟,杨兆林,等.苏里格地区下古生界马家沟组地层水化学特征与天然气聚集关系[J].西安石油大学学报:自然科学版,2012,27(1):35-41ZHAO Wei-wei,WANG Xiu-juan,YANG Zhao-lin,et al.Relationship between hydrochemical characteristics of Ma-jiagou formation water in Lower Paleozoic in Sulige regionand natural gas accumulation[J].Journal of Xi'an ShiyouUniversity:Natural Science Edition,2012,27(1):35-41.
[9]刘昊伟,郑兴远,陈全红,等.华庆地区长6深水沉积低渗透砂岩储层特征[J].西南石油大学学报:自然科学版,2010,32(1):21-26.LIU Hao-wei,ZHENG Xing-yuan,CHEN Quan-hong,etal.Analysis on characteristics of deep-water sedimentarytight sandstone reservoir of Chang 6 in Huaqing area[J].Journal of Southwest Petroleum University:Science&Technology Edition,2010,32(1):21-26.
[10]张新新,赵靖舟,马静辉,等.苏里格气区盒8段地层古今构造特征及其对气水分布的控制作用[J].西安石油大学学报:自然科学版,2011,26(3):14-20.ZHANG Xin-xin,ZHAO Jing-zhou,MA Jing-hui,et al.Ancient and modern tectonic characteristics of 8th memberof Xiashihezi Formation in Sulige Gasfield,Ordos Basin,China and their control effects on gas-water distribution[J].Journal of Xi'an Shiyou University:Natural ScienceEdition,2011,26(3):14-20.
[11]李荣西,段立志,张少妮,等.鄂尔多斯盆地低渗透油气藏形成研究现状与展望[J].地球科学与环境学报,2011,33(4):364-372.LI Rong-xi,DUAN Li-zhi,ZHANG Shao-ni,et al.Reviewon oil/gas accumulation with low permeability in OrdosBasin[J].Journal of Earth Sciences and Environment,2011,33(4):364-372.
[12]Shuey R T.A simplification of the ZoeppritZ equations[J].Geophysics,1985,50(4):609-614.
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