速度-密度关系欠定参数研究及应用
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摘要
地震资料解释中很多时候需要研究速度-密度关系,当一个目标研究区缺少可靠的声波或密度测井时,Gardner公式为我们提供了一种重构这些曲线的有效途径,但是原始Gardner经验公式在解决具体问题时往往误差较大,在此基础上开展的岩石物理特征分析、预测储层结果不确定性大大增加。本文以南海北部湾盆地涠洲组地层为研究对象,探讨储层预测过程中速度-密度关系在不同岩性、不同层段情况下利用Gardner开展曲线重构时欠定参数的优化方法以及最终推荐使用结果,并经过误差分析、匹配性比较、合成地震记录及地震波阻抗反演结果分析,效果较好。该方法已经推广到南海西部海域各研究目标层组的曲线重构当中,效果良好。
Relationship between velocity and density is often discussed and used in seismic interpretation period.When reliable DT or density log is lacked in the objective survey,Gardner equation is an useful tool for reconstructing one log curve with another.But it brings large errors in usual.So,uncertainty is unsure or expanded for petrophysical analysis and reservoir prediction.In this article,WZ formation was taken as an example at BeiBu Gulf Basin in South China Sea.Relationship between Vp and ρ with divided lithology was researched through resolving underdeterminate parameters in Gardner equation.These parameters were checked with little error and good fitting to raw log curves.Synthetics and inversions also show better results than before.This technology has been popularized to all objective formations in NanHai West Oil fields and has brought into a good effect also.
Relationship between velocity and density is often discussed and used in seismic interpretation period.When reliable DT or density log is lacked in the objective survey,Gardner equation is an useful tool for reconstructing one log curve with another.But it brings large errors in usual.So,uncertainty is unsure or expanded for petrophysical analysis and reservoir prediction.In this article,WZ formation was taken as an example at BeiBu Gulf Basin in South China Sea.Relationship between Vp and ρ with divided lithology was researched through resolving underdeterminate parameters in Gardner equation.These parameters were checked with little error and good fitting to raw log curves.Synthetics and inversions also show better results than before.This technology has been popularized to all objective formations in NanHai West Oil fields and has brought into a good effect also.
引文
[1]朱广生等.密度与纵横波速度关系.地球物理学报,1995,38(增刊1):260~264.
[2]Gardner.G.H.F,Formation velocity anddensity——the diagnostic basics for strati-graphic traps.Geophysics.1974,39:770-780.
[3]黄小平,高玉春.对Gardner公式应用条件探讨.新疆石油地质,2000,21(3):233~234.
[4]李敬功.利用常规测井资料计算气藏横波速度.岩性油气藏,2007,19(2):67~70.
[5]姚永君.测井资料在储层反演中的应用.测井技术,2005,29(4):349~352.
[2]Gardner.G.H.F,Formation velocity anddensity——the diagnostic basics for strati-graphic traps.Geophysics.1974,39:770-780.
[3]黄小平,高玉春.对Gardner公式应用条件探讨.新疆石油地质,2000,21(3):233~234.
[4]李敬功.利用常规测井资料计算气藏横波速度.岩性油气藏,2007,19(2):67~70.
[5]姚永君.测井资料在储层反演中的应用.测井技术,2005,29(4):349~352.
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