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Abstract

Summary

This paper presents an integrated approach to petrophysical evaluation for a shale gas play in Southwest China, where most of the wells lack advanced logs (nuclear magnetic resonance, geochemical log, dielectric log, etc.). Firstly, a petrophysical model that consists of two parts is established. One is porosity and the other is rock matrix including kerogen, clays, feldspar, quartz and carbonates. Based on the differences of log response values of clay and non-clay minerals, a practical clay index that combines the density with neutron logs is introduced to estimate the clay volumes. Furthermore, a novel method is proposed to evaluate the total-organic-carbon (TOC) qualitatively and quantitatively by overlaying the gamma ray log and the clay index. After transferring TOC to kerogen volume, the porosity, feldspar, quartz and carbonates are calculated by using three log response equations and the ‘sum of volumes’ constraint equation. Besides, the Archie equation is used to compute water saturation. The effectiveness and reliability of the integrated method have been verified by core data. The advantage of this study is that the approach is based on traditional logs only. Thus, it is worthy of applying to other shale gas plays worldwide.

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/content/papers/10.3997/2214-4609.201412682
2015-06-01
2024-04-24

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References

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Integrated Petrophysical Evaluation for a Shale Gas Play in Southwest China
Conference Proceedings 2015, 1 (2015); https://doi.org/10.3997/2214-4609.201412682
/content/papers/10.3997/2214-4609.201412682
/content/papers/10.3997/2214-4609.201412682
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