均值为“零”的曲线重构技术在地震反演中的应用
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摘要
在储集层与非储集层的声波曲线没有明显差异的地区内,利用波阻抗反演技术进行储集层预测比较困难,应用曲线重构技术则可获得明显的地质效果。传统的曲线重构技术改变了原有的时—深关系,反演后的层位与原地震层位存在较大误差,通过在目的层实现特征曲线均值为零的特殊手段进行特征曲线重构,既反映目的层岩性变化,又较好地保留了原始曲线代表的实际地质特征,较好地解决了曲线重构中存在的问题,提高了测井约束反演的可靠性。在葡萄沟地区的应用中,重构前、后合成地震记录的对比表明,只是波组特征有所变化,而时—深对应关系基本没有改变,在该地区准确地预测了七克台组4个砂组的平面变化,与地质认识吻合,证实了方法的可行性,值得进一步推广应用。
It is difficult to predict reservoir with wave impedance inversion in areas where the sonic seismogram has no distinct differences between reservoir layers and non-reservoir layers. Curve reconstruction is used in the areas and obvious effects could be obtained. Since the traditional curve reconstruction method changes the original time-depth chart, horizons after inversion have fairly big errors with the original seismic horizons. To reconstruct type curves with a special approach, which makes the mean values of the type curves equal zero, can not only reveal the lithological changes of the targets, but also remain the actual geologic features represented by the original curves. Hence problems occurred in curve reconstruction can be well solved and the reliability of constrained log inversion be improved. The application of this technique in Putaogou region shows that the areal changes of four sand layers of Qiketai formation can be properly predicted in accordance with the geologic understandings.
It is difficult to predict reservoir with wave impedance inversion in areas where the sonic seismogram has no distinct differences between reservoir layers and non-reservoir layers. Curve reconstruction is used in the areas and obvious effects could be obtained. Since the traditional curve reconstruction method changes the original time-depth chart, horizons after inversion have fairly big errors with the original seismic horizons. To reconstruct type curves with a special approach, which makes the mean values of the type curves equal zero, can not only reveal the lithological changes of the targets, but also remain the actual geologic features represented by the original curves. Hence problems occurred in curve reconstruction can be well solved and the reliability of constrained log inversion be improved. The application of this technique in Putaogou region shows that the areal changes of four sand layers of Qiketai formation can be properly predicted in accordance with the geologic understandings.
引文
[1]张塞,吴坚,邹玉苹,等.波阻抗反演在区域层序地层研究中的应用[D].43届SEG论文,2004.
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[2]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.
[3]赵海宽,张延章,王国鹏,等.基于模型的曲线重构地震反演技术及应用分析[J].新疆地质,2005,23(1):89.
[4]雍世和,张超谟.测井数据处理与综合解释[M].北京:石油大学出版社,1996.43.
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