THE FORMATION AND PETROLEUM-BEARING CAPACITY OF TRAPS IN THE FRONTAL UPLIFT OF THE FORELAND BASIN——TAKING THE SHAYA UPLIFT OF THE TARIM BASIN AS AN EXAMPLE

The frontal uplift of the foreland basin is an important petroleum accumulation zone.Its special tectonic location and complicated dynamic evolution process have led to the formation and distribution of traps.The Shaya Frontal Uplift in the petroleum system sourced from Triassic and Jurassic in the Kuqa Basin of the Tarim Basin has experienced 4 stages of tectonic movement:compression and rudiment formation(Hercynian),compression finalization(Indosinian-early Yanshanian),arch(late Yanshanian-middle Himalayan),compression and depression(late Himalayan).Relation exists between trap formations and tectonic movements,accumulations and source rock evolutions as well as episodic tectonic movements;hence the petroleum-bearing capacity of traps is closely related to trap formation and petroleum migration stages.3 levels of favorable tectonic zones are divided in the Shaya Frontal Uplift.