密度—深度变化规律对重力反演沉积盆地基底深度的影响分析
详细信息 查看官网全文
- 论文作者：冯旭亮
- 年：2017
- 作者机构：西安石油大学地球科学与工程学院;
- 论文关键词：沉积盆地基底 ; 密度-深度变化 ; 重力反演
- 会议召开时间：2017-04-25
- 会议录名称：中国石油学会2017年物探技术研讨会论文集
- 语种：中文
- 分类号：P631.1
- 学会代码：SYDQ
- 会议名称：中国石油学会2017年物探技术研讨会
- 会议地点：中国天津
- 主办单位：中国石油学会物探专业委员会
- 学会名称：石油地球物理勘探编辑部
- 页数：4
- 文件大小：886k
- 原文格式：O
- 会议级别：全国
摘要
利用重力反演沉积盆地基底深度时,盆地沉积层与基底之间的密度差是一个很重要的因素。最初沉积盆地基底深度的重力反演采用常密度模式,随后一些学者认识到受沉积作用等的影响,沉积层的密度随着深度的增加而变化,这种变化规律可用函数表示。然而,如何根据已知条件得到相应的密度-深度变化函数的系数是一个问题,另外,在反演时如何选择正确的密度-深度变化规律也是一个难题。本文总结了不同的密度-深度表达式,给出了这些表达式的系数计算方法,并推导了不同的密度-深度模式的基底深度反演计算式,然后通过模型试验,说明了密度-深度变化规律对反演结果的影响,给出了反演时选取密度变化模式的一般原则。
引文
[1]Bott M H P.The use of rapid digital computing method for direct gravity interpretation of sedimentary basins.Geophys.J.R.astr.Soc,1960,3:63~67
[2]Cordell L.Gravity analysis using an exponential density-depth function—San Jacinto Graben,California.Geophysics,1973,38(4):684~690
[3]Murthy I V R,Rao D B.Gravity anomalies of two-dimensional bodies of irregular cross-section with density contrast varying with depth.Geophysics,1979,44(9):1525~1530
[4]Rao D B.Modelling of sedimentary basins from gravity anomalies with variable density contrast.Geophys.J.R.astr.Soc.,1986,84:207~212
[5]Garcia-Abdeslem J.2D modeling and inversion of gravity data using density contrast varying with depth and source basement geometry described by the Fourier series.Geophysics,2003,68(6):1909~1916
[6]Litinsky V A.Concept of effective density:Key to gravity depth determinations for sedimentary basins.Geophysics,1989,54(44):1474~1482
[7]Rao C V,Chakravathi V,Raju M L.Forward modeling:Gravity anomalies of two-dimensional bodies of arbitrary shape with hyperbolic and parabolic density functions.Computers&Geosciences,1994,20(5):873~880
[8]Zhou X.Analytic solution of the gravity anomaly of irregular 2D masses with density contrast varying as a 2D polynomial function.Geophysics,2010,75(2):I11~I19
[9]Silva J B C,Santos D F,Gomes K P.Fast gravity inversion of basement relief.Geophysics,2014,79(5):G79~G91
[2]Cordell L.Gravity analysis using an exponential density-depth function—San Jacinto Graben,California.Geophysics,1973,38(4):684~690
[3]Murthy I V R,Rao D B.Gravity anomalies of two-dimensional bodies of irregular cross-section with density contrast varying with depth.Geophysics,1979,44(9):1525~1530
[4]Rao D B.Modelling of sedimentary basins from gravity anomalies with variable density contrast.Geophys.J.R.astr.Soc.,1986,84:207~212
[5]Garcia-Abdeslem J.2D modeling and inversion of gravity data using density contrast varying with depth and source basement geometry described by the Fourier series.Geophysics,2003,68(6):1909~1916
[6]Litinsky V A.Concept of effective density:Key to gravity depth determinations for sedimentary basins.Geophysics,1989,54(44):1474~1482
[7]Rao C V,Chakravathi V,Raju M L.Forward modeling:Gravity anomalies of two-dimensional bodies of arbitrary shape with hyperbolic and parabolic density functions.Computers&Geosciences,1994,20(5):873~880
[8]Zhou X.Analytic solution of the gravity anomaly of irregular 2D masses with density contrast varying as a 2D polynomial function.Geophysics,2010,75(2):I11~I19
[9]Silva J B C,Santos D F,Gomes K P.Fast gravity inversion of basement relief.Geophysics,2014,79(5):G79~G91