1887

Abstract

Summary

Deep-water deposits (derived from gravity-driven processes) are significant exploration and production targets offshore Borneo. Some of these deposits, such as turbidities provide excellent quality reservoirs, however the interbedded mass-transport deposits comprising slides, slumps and debris flows, within the study area, do not. An increasing amount of borehole data from off-shore Borneo shows that these deposits present challenges to their interpretation if the geology is not considered and integrated into the formation evaluation workflow. Case studies presented here show how identification and interpretation of slumps helps to explain: fluid-type distribution, the ability to acquire formation pressures, and also changes in large-scale paleoslope, potentially diverting sand (reservoir) fairways. These case studies show the value of understanding the geology and the crucial role it plays in formation evaluation and characterising the reservoir from pore-scale to mega-structures. Underestimating, or not appreciating this value, risks ineffective use of resources, by-passed pay, or even abandonment of a potentially productive well. It is recommended that formation evaluation campaigns adequately capture the data required for geological interpretation. In summary it is necessary to integrate geology with petrophysics and reservoir engineering to understand the good, the bad, and the ugly.

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/content/papers/10.3997/2214-4609.20132109
2014-02-17
2024-03-28
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References

  1. Strachan, L.J.
    [2008] Flow transformations in slumps: a case study from the Waitemata Basin, New Zealand. Sedimentology, 55, 1311–1332.
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    [1979] The use of slump structures as palaeoslope orientation estimators. Sedimentology, 26, 83–99.
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