标题：Hydrocarbon accumulation in basins with multiple phases of extension and inversion examples from the Western Desert (Egypt) and the western Black Sea
摘要：Folds associated with inverted extensional faults areimportant exploration targets in many basins across our planet. A commoncause for failure to trap hydrocarbons in inversion structures is crestalbreaching or erosion of top seal. The likelihood of failure increases as theintensity of inversion grows. Inversion also decreases the amount ofoverburden, which can adversely affect maturation of source rocks within theunderlying syn-extensional stratigraphic section. However, many rift basinsare multi-phase in origin, and in some cases the various syn-rift andpost-rift events are separated by multiple phases of shortening. When aninversion event is followed by a later phase of extension and subsidence,new top seals can be deposited and hydrocarbon maturation enhanced orreinitiated. These more complex rift histories can result in intra-basinalfolds that have higher chances of success than single-phaseinversion-related targets. In other basins, repeated inversion events canoccur without significant intervening extension. This can also produce morecomplicated hydrocarbon maturation histories and trap geometries. Multiplephases of rifting and inversion affected numerous basins in North Africa andthe Black Sea region and produced some structures that are now prolifichydrocarbon producing fields and others that failed. Understanding abasin's sequence of extensional and contractional events and the resultingcomplex interactions is essential to formulating successful explorationstrategies in these settings.
