Deformation Profile Analysis of Deepwater Sabah Toe-Thrust Structural Trends – Observations on Structural Kinematics and Implications on Sedimentary Fairway Distribution Patterns
| Autor: | Steve M. Barker, Mohd Asraf Khamis, Siti Aishah Abdullah, Yoshiaki Watanabe, John Jong |
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| Rok vydání: | 2018 |
| Předmět: |
Distribution (number theory)
Thrust 02 engineering and technology Kinematics Deformation (meteorology) 010502 geochemistry & geophysics 01 natural sciences 020401 chemical engineering Sedimentary rock Profile analysis 0204 chemical engineering Geology Seismology 0105 earth and related environmental sciences |
| Zdroj: | Day 4 Fri, March 23, 2018. |
| DOI: | 10.4043/28338-ms |
| Popis: | This study aims to provide supporting evidence for a semi-qualitative understanding of the various deformational episodes experienced in the studied structures of deepwater Sabah toe-thrust trends, covering from the deeper Kinarut reservoir interval to seabed in a temporal and spatial framework. A quantitative analysis of the deformation profiles was conducted to observe their effect on sedimentary patterns, integrated with amplitude analysis and spectral decomposition volume interpretation. The basic principal of line balance restoration was employed to unravel the deformation history of three investigated structural trends: Trend 1 ("M-La-S"), Trend 2 ("L-B-P") and Trend 3 ("Pg-Lt-U"), with the fundamental assumption that a geological section will restore at any particular moment in time to an unstructured section according to the law of superposition and horizontality. These toe-thrust anticlines were examined by calculating the rate of shortening at different geological times over the section utilising a number of line sections. All three trends have experienced a dominant NW-SE oriented compression from Early Miocene until Late Miocene, during the closing of the proto-South China Sea and the subsequent opening of South China Sea. These regional tectonic events impacted directly on the structuration style in the study area. The quantitative analysis has shown that the structuration and deformation history of each of the studied structures varied along the structural trends. Late stage deformation episodes, which possess a higher stress regime play a significant role on the rate of shortening on each anticline and its fold geometry. These variations influence sediment fairway distributions and impact on the selection of exploration targets and reservoir objectives. The study demonstrated a fundamental genetic link between structural growth and sedimentary fairway loci. It is concluded that the key to reducing reservoir risk is to first understand the kinematic growth profiles and deformation history of the studied structures. Well-developed structural kinematic models and the establishment of the deformation history of the studied toe-thrust anticlines in deepwater Sabah will have a paramount impact for more reliable predictions of sedimentary fairway distribution patterns, where effort to locate sandy reservoir remains a critical challenge for deepwater exploration. |
| Databáze: | OpenAIRE |
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