川东南旺隆及周边地区T_1j~(2-1)-T_1j~1储层地球物理响应特征分析
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摘要
川东南地区嘉陵江组T1j2-1-T1j1碳酸盐岩储层具有低孔隙度、低渗透率、单层厚度薄、非均质性强的特征,勘探难度较大。综合考虑T1j2-2,T1j2-1和T1j1地层的地质特征,通过地质、测井进行合成记录层位标定,建立正演模型,探讨了旺隆及周边地区储层的测井响应特征和地震响应特征,提取了地震属性对储层进行横向预测研究。结果显示,中-强振幅、同相轴下拉、同相轴分叉、频率降低现象代表储层发育。地震属性分析结果表明太和、旺隆地区储层较发育,这与钻井显示较吻合,说明该方法可以较好地预测出该套储层的分布范围,为进一步勘探提供了依据。
T1j2-1-T1j1(Lower Traissic Jialingjiang Formation) reservoirs in Southeast Sichuan are characterized by thin single layers,low porosity,low permeability,strong heterogeneity and highly difficult exploration.By analysing various geological characteristics of T1j2-2,T1j2-1 and T1j1 formations and log curves,the synthetic seismogram and fine models are built and the seismic responses of reservoirs in Wanglong and surrounding area studied.Seismic attributes to predict reservoirs are extracted.The results show that the phenomena of a moderate-strong amplitude,dropping-down phase axis,bifurcating phase axis and low frequency represent favorable reservoirs.The prediction of seismic attributes shows that favorable reservoirs grow in Taihe and Wanglong,according with the drillings.All these illustrate that the method can well predict the distribution of reservoirs and provide the basis for a further exploration.
T1j2-1-T1j1(Lower Traissic Jialingjiang Formation) reservoirs in Southeast Sichuan are characterized by thin single layers,low porosity,low permeability,strong heterogeneity and highly difficult exploration.By analysing various geological characteristics of T1j2-2,T1j2-1 and T1j1 formations and log curves,the synthetic seismogram and fine models are built and the seismic responses of reservoirs in Wanglong and surrounding area studied.Seismic attributes to predict reservoirs are extracted.The results show that the phenomena of a moderate-strong amplitude,dropping-down phase axis,bifurcating phase axis and low frequency represent favorable reservoirs.The prediction of seismic attributes shows that favorable reservoirs grow in Taihe and Wanglong,according with the drillings.All these illustrate that the method can well predict the distribution of reservoirs and provide the basis for a further exploration.
引文
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[2]朱其,李国蓉,乔占峰,等.四川盆地泸州古隆起嘉陵江组储层特征研究[J].四川地质学报,2008,28(1):30-34.
[3]张晓东,谭秀成,陈景山.川中-川南过渡带嘉二段储集性及储层控制因素研究[J].天然气地球学,2005,16(3):82-86.
[4]魏祥峰,张廷山,黄世伟,等.赤水地区下三叠统嘉陵江组嘉二1-嘉一段及嘉五1亚段沉积相分析[J].中国地质,2009,36(2):334-335.
[5]王长城,施泽进,张光荣,等.川东南嘉陵江组储层地质特征及储层预测研究[J].西南石油学院学报,2008,21(1):36-38.
[6]孙珍芹.贵州赤水凹陷西部地区三叠纪沉积环境与储层特征分析[J].南方油气,2005,18(1):17-21.
[7]宁松华.地震属性分析在托浦台储层预测中的应用[J].石油天然气学报,2006,28(5):70-731.
[8]COOK D,SENA A,O’DONNELL G.What is thebest seismic attribute for quantitative seismic reser-voir characterization[C]//Annual MeetingAbstracts,Society of Exploration Geophysicists.Tulsa:Society of Exploration Geophysicists,1999:1588-1591.
[9]BROWN A R.Seismic attributes and their classifica-tion[J].The Leading EAEG,1996,15(10):1090.
[10]苏玉山,王生郎,张联盟,等.超压异常对东濮凹陷深层油气成藏的控制作用[J].石油勘探与开发,2002,29(2):49-521.
[11]CASTAGNA J P,SUN Shengjie,SIEGFRIED RW.Instantaneous spectral analysis:Detection oflow-frequency shadows associated with hydrocarbons[J].The Leading Edge,2003,22(2):120-127.
[12]GOLOSHUBIN G,VAN SCHUYVER C.Reser-voir i maging using lowfrequencies of seismic reflec-tions[J].The Leading Edge,2006,25(5):527-531.
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