In situ mineralogy and permeability logs from downhole measurements: Application to a case study in chlorite‐coated sandstones
In situ mineralogy and permeability logs from downhole measurements: Application to a case study in chlorite‐coated sandstones
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井下测量的原位矿物学和渗透率测井：在绿泥石包覆砂岩案例研究中的应用
DOI：
10.1029/2002jb002178
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发表时间：
2003
影响因子：
--
通讯作者：
E. Brosse
中科院分区：
文献类型：
--
作者：
A. Rabaute;A. Revil;E. Brosse
[1]测井技术提供了各种现场物理性质的连续剖面，如地质构造的体积密度、光电效应和自然伽马放射性。我们的目的是利用这些信息来确定矿物学随深度的连续剖面。然后将测井衍生矿物学与岩石物理模型相结合，以推断含绿泥石砂岩地层中的连续渗透率和饱和度剖面。我们的矿物学反演算法结合了原始数据的聚类分析和使用Tarantola和Valette [1982]开发的广义非线性反演方法的反演。一个现场案例是关于一个钻孔交叉的砂岩和页岩的交替处理。我们获得的矿物学日志是在非常好的协议与独立测量的岩心样品的矿物比例。矿物学剖面与特定的结构模型相结合，以获得连续的渗透率剖面。我们发现，这个计算的渗透率日志和独立的核心渗透率测量超过3个数量级之间的非常好的协议。
[1] Well-logging techniques provide continuous profiles of various in situ physical properties like the bulk density, the photoelectric effect, and the natural gamma radioactivity of geological formations. Our purpose is to use this information to determine a continuous profile of the mineralogy with depth. The well-log derived mineralogy is then combined with a petrophysical model to infer continuous permeability and saturation profiles in chlorite-bearing sandstone formations. Our mineralogical inversion algorithm combines a cluster analysis of the raw data and their inversion using the generalized nonlinear inverse method developed by Tarantola and Valette [1982]. A field case is treated concerning a borehole intersecting an alternation of sandstones and shales. The mineralogical logs we obtained are in very good agreement with the mineral proportions measured independently on core samples. Mineralogical profiles are combined with a specific textural model to derive a continuous profile of permeability. We found a very good agreement between this computed permeability log and independent core permeability measurements over 3 orders of magnitude.