微测井资料三维表层速度统计建模方法研究
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摘要
在西部复杂山地地震勘探中,静校正问题尚未完全得到解决,其主要原因是表层速度模型存在困难。微测井测量作为一种传统的较准确的表层速度调查手段,不受复杂地表条件限制,适用于复杂地区观测,但其生产成本高,不能保证逐点连续观测,因而不能直接获得连续的近地表速度模型。这里研究出了起伏地表微测井离散数据地质统计三维建模方法。首先建立基于起伏地表和微测井速度分层的地质框架模型,由地震勘探测量数据形成地表面,依据地质统计技术生成与地形相关的低速带、降速带底面,在此基础上形成微测井离散数据表层速度模型。将该方法应用于川东北HCL工区,利用三百七十口微测井离散数据得到了三维表层速度模型,与微测井速度对比,模型速度精度较高。
During the seismic explorations of complex mountain regions in west China,the static corrections have not been completely resolved as a result of the difficulty in ascertaining surface velocity model.As a traditional and accurate investigation method of surface velocity,micro logging measurement is not confined by the complex surface conditions and is applicable to the investigation in complex regions.However its high production cost is not able to guarantee the continuous observation point by point.Therefore,the continuous near-surface velocity model can′t be directly obtained.The paper proposed a three-dimensional modeling method by geological statistics of micro logging discrete data in rugged topography.The steps are as follows: First,ground surface is formed using measured data in seismic exploration.Then,the bottom surface of low velocity layer,which is related to terrain,is obtained using geological statistical techniques.On this basis,a geological framework model based on irregular surface and layered micro logging velocity is acquired.Finally,the surface velocity model of micro logging discrete data is received by near-surface geological structure and geological statistical technique.This method is applied to the HCL research area in northeast Sichun.The discrete data of 370 micro logging wells were used to get the three-dimensional surface velocity model.In comparison with the micro logging velocity,the velocity from the model is with a much higher accuracy.
During the seismic explorations of complex mountain regions in west China,the static corrections have not been completely resolved as a result of the difficulty in ascertaining surface velocity model.As a traditional and accurate investigation method of surface velocity,micro logging measurement is not confined by the complex surface conditions and is applicable to the investigation in complex regions.However its high production cost is not able to guarantee the continuous observation point by point.Therefore,the continuous near-surface velocity model can′t be directly obtained.The paper proposed a three-dimensional modeling method by geological statistics of micro logging discrete data in rugged topography.The steps are as follows: First,ground surface is formed using measured data in seismic exploration.Then,the bottom surface of low velocity layer,which is related to terrain,is obtained using geological statistical techniques.On this basis,a geological framework model based on irregular surface and layered micro logging velocity is acquired.Finally,the surface velocity model of micro logging discrete data is received by near-surface geological structure and geological statistical technique.This method is applied to the HCL research area in northeast Sichun.The discrete data of 370 micro logging wells were used to get the three-dimensional surface velocity model.In comparison with the micro logging velocity,the velocity from the model is with a much higher accuracy.
引文
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[5]吕公河.地震勘探虚反射界面的测定及其利用[J].石油地球物理勘探,2002,37(3):296.
[6]杨海申,何庆华,梁秀文,等.VSP三分量微测井技术在表层调查中的应用[J].石油地球物理勘探,2006,41(2):160.
[7]吉海龙.田俊平低降速带调查方法在车排子地区排井西的应用[J].油气地球物理,2008,6(2):43.
[8]段云卿,皮金云,刘兵,等.三分量小折射表层调查研究[J].石油地球物理勘探,2008,43(6):652.
[9]李刚,王欢,刘江玉.微测井技术在地震资料静校正处理中的应用[J].大庆石油地质与开发,2002,21(4):80.
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[13]赵鹏大,魏民.地质勘探中的统计分析[D].北京:中国地质大学出版社,1990.
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