一维垂直各向异性结构海洋CSEM数据的频域反演

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS 地球物理学报 Pub Date : 2016-01-01 DOI:10.6038/cjg20161134
M. Luo, Li Yuguo, Gang Li
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引用次数: 0

摘要

海洋可控源电磁(CSEM)方法已被证明是地震成像技术在海上油气储层勘探和近地面勘探中的重要补充。在工业CSEM数据集的反演和解释中,该方法可以通过假设各向同性在许多情况下使用。然而,由于沉积物中的薄层互层或颗粒排列,地壳中存在电各向异性,可以显著改变EM接收器测量的响应。在解释海洋CSEM数据时,忽略各向异性可能导致海底电导率结构图像失真,甚至误读。本文提出了一种在垂直各向异性层状介质中由标题偶极子源产生的频率域海洋可控源电磁数据的反演方法。这种方法是基于高斯-牛顿格式。我们将海洋CSEM场的公式推广到计算任意取向偶极子源激发的电磁场。用解析法计算了电磁场对水平电阻率和垂直电阻率的偏导数。基于反演模型的水平电阻率(ρh)和垂直电阻率(ρv)之间的关系,提出了一种正则化因子的自适应选择方法,以平衡数据失拟和构造约束的影响。综合反演和实际反演结果表明,该反演方法可以重建上覆层和基底的各向异性电阻率,并能较好地恢复储层的埋深、厚度和垂向电阻率。多频率、多分量的数据集可以获得较好的重构效果。结合横向和横向几何数据集,可以在重建储层埋深和各向异性基底电阻率方面提供高分辨率。
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Frequency-domain inversion of marine CSEM data in one-dimensional vertically anisotropic structures
The marine controlled-source electromagnetic (CSEM) method has proven to be an important addition to seismic imaging techniques in exploration of offshore hydrocarbon reservoirs and near-surface investigations. In inversion and interpretation of industrial CSEM data sets, this method can be used in a number of situations by assuming isotropy. However, the presence of electric anisotropy in the Earth's crust, due to thin layer interbedding or grain alignments in the sediments, can significantly alter the response measured by the EM receivers. Ignoring anisotropy in interpreting marine CSEM data may lead to distorted images of seabed conductivity structures, even misinterpretation.#br#In this paper, we present an inversion method for frequency domain marine controlled-source electromagnetic data generated by a titled dipole source in vertically anisotropic stratified media. This approach is based on the Gauss-Newton scheme. We extend and generalize the formulation of marine CSEM fields to calculation of the electromagnetic fields excited by arbitrarily oriented dipole sources. The partial derivatives of the electromagnetic fields with respect to both the horizontal and vertical resistivity are analytically calculated. Based on the relationship between the horizontal resistivity (ρh) and the vertical resistivity (ρv) of the inversion model, an adaptive selection method for regularization factors is proposed to balance the effects of the data misfit and the structural constraint.#br#The synthetic and real data inversion tests indicate that our inversion method can reconstruct the anisotropic resistivity of the overburden layer and the basement, and the burial depth, the thickness and the vertical resistivity of the reservoir layer can be well recovered. A better reconstruction can be obtained with multiple frequency and multiple component data sets. Combing inline and broadside geometry data sets can provide high resolution in reconstructing the burial depth of the reservoir layer and resistivity of the anisotropic basement.
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来源期刊
地球物理学报
地球物理学报 地学-地球化学与地球物理
CiteScore
3.40
自引率
28.60%
发文量
9449
审稿时长
7.5 months
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