1887

Abstract

Summary

High magnitude overpressures are common in the Baram Delta and have historically presented operational challenges in almost all hydrocarbon wells. This study is the first known attempt at examining the local clay mineralogy and its role in the preservation of overpressures.

A novel slow scan XRD technique was first used to accurately measure clay mineral composition with the resulting diffractograms being decomposed to identify the contribution of discrete illite. The Ktibler Index (KI) classification for illite crystallinity was then applied to quantify the extent of low-grade metamorphism, with a scanning electron microscope providing additional textural and mineralogical information.

The presence of deviations in the KI illite crystallinity readings suggests that tectonic movements, especially faulting and inversion, has likely played a key role in clay transformation and the preservation of overpressures. In addition, the observation of a morphological transition from flaky to filamentous forms of illite, which can potentially impede pore spaces by means of occlusion, provides a mechanism for the retention of overpressures.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.202477198
2024-11-20
2026-02-11

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References

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/content/papers/10.3997/2214-4609.202477198
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Clay Mineral Transformation in the Baram Delta and its Role in the Preservation of Overpressures
Conference Proceedings 2024, 1 (2024); https://doi.org/10.3997/2214-4609.202477198
/content/papers/10.3997/2214-4609.202477198
/content/papers/10.3997/2214-4609.202477198
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