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Home Studies SE Asia GDE Mapping

Circum-South China Sea Study GIS-based G&G Database

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Using JMJ’s existing GIS-based G&G database and study reports for Offshore China, Vietnam, Malaysia, Brunei and the Philippines, the study programme has been designed to generate a unique dataset and project database that will provide a consistent set of predictive source and reservoir facies maps for the entire circum-South China Sea region. Where possible this mapping is being constrained by well and seismic data, with the aim to clearly highlight areas that are lacking such control.

Tectonic and Structural Modelling

Unresolved problems and alternative models for the tectonic evolution of the South China Sea have been reviewed in an attempt to identify what is known and evaluate what is presumed about the infrastructural framework of the region. Using gravity and magnetics data integrated with seismic and well, the first phase of the study programme has been designed to define:

  • Original (pretectonic) continental block outlines
  • First-order tectonic elements and predominant structural basement fabrics
  • Distribution of different crustal types (continental, oceanic and heterogeneous) and their boundaries
  • The extent of igneous intrusives and volcanics
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The resultant composite palaeotectonic model has been further assessed and modified by using potential fields and seismic data to define original pre-rift and pre-drift continental block outlines. A particular focus has been to establish the original configuration of the rift systems on both conjugate margins of the South China Sea, with regards to the distribution and quality of both Eocene and Oligocene potential source rocks. This, in turn, has been used to produce a series of palaeotectonic and depositional reconstructions for key reservoir intervals. The mapped distribution of different crustal types and intensity of Tertiary extensional activity will be a principal constraint for predicting palaeoheat flow gradients for determining basin subsidence and source rock maturation histories.

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