PETROLEUM EXPLORATION

Growth of forearc highs and basins in the oblique Sumatra subduction system

  • MUKTI Maruf M ,
  • MAULIN Hade B ,
  • PERMANA Haryadi
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  • 1. Geotechnology, Indonesian Institute of Sciences, Bandung 40135, Indonesia;
    2. Pertamina Hulu Energi Ogan Komering, Jakarta 12520, Indonesia

Received date: 2020-11-24

  Online published: 2021-05-21

Abstract

By analyzing the structure deformation of the oblique Sumatra subduction system, the uplift mechanisms of forearc high and the formation of the forearc basin in this system are studied. The development of the forearc high is attributed to the flexing and uplifting, basin reversal, and the uplifting of the older accretion wedge and the backthrust of the accretion wedge toward the continental margin. The latest seismic reflection data shows that the interplay between trenchward-vergent thrusts and arcward-vergent thrusts has played a major role in the uplift of forearc high. The uplifted sediments on the forearc high were previously formed in a forearc basin environment. The present-day morphology of the forearc high and forearc basin is related to the uplift of the accretionary wedge and the overlying forearc basin sediments in Pliocene. Regardless of obliquity in the subduction system, the Sumatran forearc region is dominated by compression that plays an important role in forming Neogene basin depocenters that elongated parallel to the trench.

Cite this article

MUKTI Maruf M , MAULIN Hade B , PERMANA Haryadi . Growth of forearc highs and basins in the oblique Sumatra subduction system[J]. Petroleum Exploration and Development, 2021 , 48(3) : 586 -594 . DOI: 10.11698/PED.2021.03.13

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