oa Occurrence of Hydrodynamic Play in Malaysia

Hydrodynamic play is known to occur in onshore basins where the elevation differences result in hydrodynamic conditions which trap huge pools of gas in basin centers. Pressure plots indicate that the gas line is below the water line as opposed to the normal condition where the gas line is above the water line. Hydrodynamic play is also likely to occur in our sedimentary basin where a sharp change in water depths can also initiate hydrodynamic conditions causing titled water contacts. Even though this hydrodynamic play exists in our basin, it was not really recognized as such. Discoveries with tilted water contacts in our own sedimentary basin will be highlighted in this paper. The tilted contacts of these hydrocarbon discoveries were simply dismissed by the operators concerned with flimsy explanation of depth and pressure measurements errors and multiple, discreet water contacts. Even specialized processing work has been carried out extensively trying very hard to flatten the tilted contact! One such example is shown in Fig. 1 with obvious titled water contact and a single gas leg and two water legs. The potential in this new play concept will also be discussed in this paper. The hydrodynamic phenomenon causes water to lie above oil and gas in either structural or stratigraphic traps. Wells drilled in the past at the crest of the structural traps may lead to the wrong dry hole conclusion. Hence, it is possible that the hydrocarbon potential downdip was not fully assessed (Fig. 2). There are also other prospects with tilted<br>contacts which have not been tested and some of these prospects will be shown in this paper.