MSulu

Potential Source-Rocks

Backarc Basins with Oceanization

In this offshore, the proposed tentative geological interpretation of a Canvas autotrace of a regional seismic line of the NE Borneo offshore, suggests a backarc basin deposited over the continental crust covered by a non Atlantic-type divergent type margin. The oceanic crust, which forms the substratum of the marginal sea - Sulu Sea - appears a little more eastward of this autotrace (sea location map). The potential generating petroleum sub-systems, is most likely, associated with the organic rich marine sediments of the sedimentary regressions deposited during the still-stand periods of the relative sea level occurring after each marine ingressions (relative sea level rises). Geoscientists know what is, erroneously, called "Transgression", is, in fact, a retrogradtional set of increasingly important marine ingressions and increasing smaller sedimentary regressions. There is no relative sea level falls between the marine ingressions (relative sea level rises), but still-stand periods of the relative sea level during which the sedimentary particles are deposited as progradational sediments (sedimentary regressions).