拟声波曲线重构反演在柳屯储层预测中的应用
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摘要
储层预测中,应依据研究区勘探开发程度的不同和储集层地质特征的差异而选择不同的反演方法。柳屯洼陷的储集层均以砂泥岩薄互层分布,常规波阻抗反演不能有效区分砂泥岩。为此提出拟声波特征曲线重构反演技术,通过对多口井测井曲线分析,优选出能够反映砂泥岩薄互层特点的曲线进行拟声波曲线重构,用重构后的曲线进行反演,以提高研究区储层预测的精准性。经实践验证,拟声波曲线重构反演分辨率高,储层预测结果与实钻结果相吻合。
Seismic inversion is an important technique for reservoir prediction.Different inversion methods will be selected according to the exploration and development degree of the study areas,and the geological characteristics of reservoirs.The reservoirs of Liutun sub-depression are distributed by alternating layers of thin sand-shale,with complicated variation of extension range and unclear response of the thin alternative layers on vertical from acoustic logs.Wave impedence inversion can’t distinguish sand-shale clearly.Pseudo-acoustic curve rebuilding inversion technique was used.By analyzing multiple well logs,the curves,which can reflect the characteristic of thin sand-shale alternative layers,were selected to rebuild pseudo-acoustic curves and then perform inversion with the rebuilt curves,thus to improve the accuracy for reservoir prediction in the study area.The method has been put into practice and achieved good results.
Seismic inversion is an important technique for reservoir prediction.Different inversion methods will be selected according to the exploration and development degree of the study areas,and the geological characteristics of reservoirs.The reservoirs of Liutun sub-depression are distributed by alternating layers of thin sand-shale,with complicated variation of extension range and unclear response of the thin alternative layers on vertical from acoustic logs.Wave impedence inversion can’t distinguish sand-shale clearly.Pseudo-acoustic curve rebuilding inversion technique was used.By analyzing multiple well logs,the curves,which can reflect the characteristic of thin sand-shale alternative layers,were selected to rebuild pseudo-acoustic curves and then perform inversion with the rebuilt curves,thus to improve the accuracy for reservoir prediction in the study area.The method has been put into practice and achieved good results.
引文
[1]张学芳,董月昌,慎国强,等.曲线重构技术在测井约束反演中的应用[J].石油勘探与开发,2005,32(3):70-72.
[2]石磊,王昌景.利用拟声波曲线进行高分辨率地震反演[J].西南石油学院学报,2004,26(5):18-20.
[3]王玉学,汤达祯,龚建华,等.拟声波反演技术在储层预测中的应用——以吐哈盆地台北凹陷胜北地区白垩系为例[J].石油实验地质,2004,26(3):303-307.
[4]杨晓兰,刘小平,赵锡桥.曲线重构反演在火成岩储层预测中的应用[J].西安石油大学学报(自然科学版),2007,6(4):32-35.
[2]石磊,王昌景.利用拟声波曲线进行高分辨率地震反演[J].西南石油学院学报,2004,26(5):18-20.
[3]王玉学,汤达祯,龚建华,等.拟声波反演技术在储层预测中的应用——以吐哈盆地台北凹陷胜北地区白垩系为例[J].石油实验地质,2004,26(3):303-307.
[4]杨晓兰,刘小平,赵锡桥.曲线重构反演在火成岩储层预测中的应用[J].西安石油大学学报(自然科学版),2007,6(4):32-35.
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