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| | Abstract | | Clay content is the most important parameter in the bimodal mixture model to interpret seismic and well logs. Since porous clay is considered in the model, we must be careful to apply the model. Here, we summarized the definition of the clay content, and then demonstrate a method to estimate the clay content from well logs in a shaley-sand sequence. Clay porosity, a key parameter to calculate the clay content, is determined from laboratory measurements and an observation of a thin section of the rock sample. Once the clay porosity is determined, we can define clay-porosity-elastic modulus relations corresponding to two disperse modes and one laminar mode of the bimodal mixture model. The interpretation chart created from the relations enables us to estimate clay content in the P-wave modulus and porosity cross-plot. This methodology gives a reasonable estimate of the clay content compared with gamma ray logs, and it is possible to extend to different applications. |
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