测井约束随机优化地震反演预测百21井区薄层砂体
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摘要
准噶尔盆地西北缘百口泉油田百21井区侏罗系八道湾组三段为曲流河沉积,其泥岩夹薄层砂体横向变化快,预测难度大。高分辨率测井约束随机优化地震反演技术利用了测井与地震数据的地质统计规律,采用随机优化理论实现对地震数据进行储集层波阻抗及其他物性的反演,无需复杂的建模过程,而且是通过解正问题来解反问题,因而使得约束比较容易实现。鉴于研究区砂泥岩波阻抗有部分区域重叠,而校正后的自然电位能很好地区分砂泥岩,因此应用该方法对目的层进行了波阻抗反演和自然电位反演,2次反演结合共同预测研究区内储集层分布情况,效果较好。
Taking prediction of member-3 mudstone with thin layer sand of Jurassic Badaowan formation in Bai-21 well area in Baikouquan oilfield in northwestern margin of Junggar basin as an example,the application of high-resolution logging constrained stochastic optimization seismic inversion technology to such a reservoir prediction is discussed,and good results are analyzed.As a further development of conventional seismic inversion,this technology takes advantage of the geostatistical law of the logging and seismic data and realizes the inversion of wave impedance and other physical properties using stochastic optimization theory,without complex modeling process.At the same time,this technology answered inverse problem by solving positive questions,thus making the constraint be relatively easy to achieve.In view of the partial overlap of sand-shale wave impedance in the study area and the corrected self-potential property that can do well in distinguishing the sandstone from mudstone,the wave impedance inversion and the self-potential inversion are all used for the target zone,in order to more properly predict the reservoir distribution in this area.
Taking prediction of member-3 mudstone with thin layer sand of Jurassic Badaowan formation in Bai-21 well area in Baikouquan oilfield in northwestern margin of Junggar basin as an example,the application of high-resolution logging constrained stochastic optimization seismic inversion technology to such a reservoir prediction is discussed,and good results are analyzed.As a further development of conventional seismic inversion,this technology takes advantage of the geostatistical law of the logging and seismic data and realizes the inversion of wave impedance and other physical properties using stochastic optimization theory,without complex modeling process.At the same time,this technology answered inverse problem by solving positive questions,thus making the constraint be relatively easy to achieve.In view of the partial overlap of sand-shale wave impedance in the study area and the corrected self-potential property that can do well in distinguishing the sandstone from mudstone,the wave impedance inversion and the self-potential inversion are all used for the target zone,in order to more properly predict the reservoir distribution in this area.
引文
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[3]王全锋,王元君,郭科,等.多井约束地震反演技术在储集层预测中的应用[J].新疆石油地质,2008,29(3):367-369.
[4]柯年日,张超谟,王英伟,等.正态分布法测井曲线标准化在M油田的应用[J].长江大学学报(自然科学版):理工卷,2010,7(4):76-78.
[5]陈守田,孟宪禄.薄互层储层预测方法[J].石油物探,2004,43(1):33-36.
[6]尚建林,李太辉,霍新勇,等.地质统计学反演预测百口泉油田百34井区薄砂体[J].新疆石油地质,2009,30(6):758-760.
[7]伊振林.井震联合窄小河道砂体预测方法研究[J].西南石油大学学报(自然科学版),2012,34(1):19-24.
[8]黄振凯,李占东,梁金中,等.基于马蒙算法的反演及其在储集层预测中的应用[J].新疆石油地质,2012,33(6):733-735.
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