Petroleum Systems of Deep-Water Basins - Gulf Coast Section SEPM
Petroleum Systems of Deep-Water Basins - Gulf Coast Section SEPM
Petroleum Systems of Deep-Water Basins - Gulf Coast Section SEPM
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SEAMAGIC or How to SAMBA in South East Asia:<br />
Reservoir and <strong>Petroleum</strong> System Controls,<br />
a Tectonic Recompilation and Prospectivity Analysis<br />
William G. Dickson<br />
DIGs<br />
12503 Exchange Drive, Suite 510A<br />
Stafford, Texas 77477<br />
e-mail: info@digsgeo.com<br />
Janice M. Christ<br />
J-SEA Geoscience<br />
3 Biscay Court<br />
The Woodlands, Texas 77381<br />
e-mail: janchrist@usa.net<br />
James W. Granath<br />
Granath & Associates<br />
14102 Langbourne Drive<br />
Houston, Texas 77077<br />
e-mail: granath@attglobal.net<br />
Mark E. Odegard<br />
Getech (Geophysical Exploration Technology, Inc.)<br />
12946 Dairy Ashford, Suite 250<br />
Sugarland, Texas 77478<br />
e-mail: meo@getech.com<br />
Abstract<br />
Remarkable correlations between gravity imagery and reservoir distribution have been documented in basins <strong>of</strong>fshore<br />
Brasil and West Africa in a simple passive margin setting. The present group has tackled Southeast Asia, and its<br />
much more complicated plate history, placing the petroliferous basins in a clearer tectonic framework. We used a GIS<br />
environment to enable faster and more precise interpretation methods and digital presentation <strong>of</strong> results. First we correlated<br />
published geological features to gravity and magnetic anomalies displayed as geotiffs (geo-referenced<br />
images). We reinterpreted, realigned and extrapolated even long-recognized features not previously imaged in their<br />
entirety, due to inadequate data coverages. We refined the location and extents <strong>of</strong> many first-order tectonic features<br />
through their gravity/magnetic signatures, including the Red River, Three Pagodas and other faults, the outlines <strong>of</strong><br />
most <strong>of</strong> the Tertiary basins, and various discovery trends.<br />
Our results contrast examples from the Campos and Lower Congo basins (showing sediment distribution controls<br />
by basement faulting and salt-involved compression respectively) with both extensional and compressional regimes in<br />
Southeast Asia. In each region, potential field signatures suggested relationships that explained reservoir distribution<br />
or controls on petroleum systems. While mapping terrane boundaries, we also reinterpreted extents <strong>of</strong> continental,<br />
oceanic and proto-oceanic crust and their depths, with natural consequences for hydrocarbon maturation modeling.<br />
Side benefits <strong>of</strong> a GIS approach are: (1) the ease with which multiple data sets from participants can be integrated and<br />
updated; and, (2) improved corporate memory as the project evolves.<br />
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