1887

Abstract

Summary

The kinematic evolution of NW offshore Sabah is discussed using a geomechanics-based restoration of two regional transects. The three main units known as Inboard Belt, Outboard Belt and Sabah Trough are dynamically maintained. The complex levels of relationships around them can be interpreted as representative of a meta-stable margin undergoing a compressive tectonics at present day. New insights suggest that gravity is the principal driving force. An evolution scenario consistent with our study is summarized. Vertical forces-driven mini-basins, seated an over-pressured, under-compacted and mobile zone upstream were, progressively replaced by lateral forces-driven rollovers, toe-thrusts and tightened imbricate thrusts successively downstream. The transfer of vertical to lateral displacements in addition to the syn-sedimentary deformation modifies the burial condition. Gravity stretching substituted by gravity shortening and tectonic shortening impact on reservoir facies distribution, source rock maturation, hydrocarbon expulsion and entrapment. The evolution of deformation-sedimentation interaction in NW offshore Sabah, here proposed, should be of interest to constrain better the basin modelling and refine the assessment of the remaining potential.

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/content/papers/10.3997/2214-4609.201526137
2015-10-12
2024-03-28
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