新场气田沙溪庙组JS_2~4砂体叠前AVO反演
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摘要
新场沙溪庙组JS42气藏储集层为河口坝砂体,单层砂体(组)厚度较大,孔隙较发育,平面分布特征清晰。试采情况表明,该气藏为受构造控制的岩性气藏,气水关系复杂。随着新场3D3C地震资料范围的扩大,为克服前期单纯利用"低频、强振幅"模式的多解性,利用地震叠前道集资料,合成横波测井曲线、正演AVO道集,分析对比高产储层及气水层属性特征差异,开展叠前AVO反演。利用泊松比与波阻抗交汇图有效地预测出JS42气藏孔隙砂体发育区和气水分布区。依据该预测结果部署钻井测试取得成功,说明叠前AVO反演方法较常规地震属性解释更有优势。
Shaximiao gas reservoir in Xinchang district is river delta sand with a relatively big thickness and high po-rosity,and the mapping feature of the reservoir is clear.Exploration and development of the reservoir demonstrate that the gas area of the reservoir is constrained both by the sand body itself and the structure characters,and the gas-water contact is very complex.With the acquisition of 3D3C seismic data and in order to overcome the uncertainty of the prior model of "low frequency and strong amplitude",we synthesized shear wave log,forward inversed the AVO gather,analyzed and compared differences of the AVO characters of gas sand and water sand,and carried out AVO inversion.The potential gas and water distribution area has been detected by crossploting impedance and Paoisson's ratio.Based on the prediction,wells have been successfully planed,indicating that prestack AVO inversion does have great advantages over conventional interpretation of seismic attributes.
Shaximiao gas reservoir in Xinchang district is river delta sand with a relatively big thickness and high po-rosity,and the mapping feature of the reservoir is clear.Exploration and development of the reservoir demonstrate that the gas area of the reservoir is constrained both by the sand body itself and the structure characters,and the gas-water contact is very complex.With the acquisition of 3D3C seismic data and in order to overcome the uncertainty of the prior model of "low frequency and strong amplitude",we synthesized shear wave log,forward inversed the AVO gather,analyzed and compared differences of the AVO characters of gas sand and water sand,and carried out AVO inversion.The potential gas and water distribution area has been detected by crossploting impedance and Paoisson's ratio.Based on the prediction,wells have been successfully planed,indicating that prestack AVO inversion does have great advantages over conventional interpretation of seismic attributes.
引文
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[4]张虹.储渗体差异性识别[J].石油物探,1999,38(4):81-88.
[5]谭万仓,侯明才,董桂玉,等.川西前陆盆地中侏罗统沙溪庙组沉积体系研究[J].东华理工大学学报(自然科学版),2008,31(4):336-343.
[6]李剑波.川西坳陷中段沙溪庙组测井相和地震相及砂体展布特征[J].成都理工学院学报,2001,28(3):279-283.
[7]刘正中,吴铬,黎华继.新场气田上沙溪庙组气藏储层表征及建模[J].天然气工业,2002,22(3):52-55.
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