Changes

==The problem==

==The problem==

Petroleum may have accumulated at a prospect sometime in the past but may not be preserved in economic quantities, even where trapping geometry is still intact. Or a trap may still contain petroleum, but the [[Oil as an energy source|oil]] and/or [[natural gas|gas]] has been diluted or altered so that [[accumulation]]s are no longer economic.

Petroleum may have accumulated at a prospect sometime in the past but may not be preserved in economic quantities, even where trapping geometry is still intact. Or a trap may still contain petroleum, but the [oil and/or [http://www.glossary.oilfield.slb.com/en/Terms/n/natural_gas.aspx gas] has been diluted or altered so that [[accumulation]]s are no longer economic.

From an explorationist's point of view, these accumulations are destroyed. The problem is to determine where destruction of accumulations is likely and what mechanisms are likely to lead to destruction of accumulations in different geological settings.

From an explorationist's point of view, these accumulations are destroyed. The problem is to determine where destruction of accumulations is likely and what mechanisms are likely to lead to destruction of accumulations in different geological settings.