Hydrocarbon accumulation mode of Shuntuo 1 well block in the Shuntuoguole lower uplift, Tarim Basin

Oil and gas were acquired from the Ordovician carbonate and the Silurian clastic rocks of Shuntuo 1 well block in the Tarim Basin. The two reservoirs were in communication via a fault, but their temperature, pressure coefficient and oil and gas properties are different. By analyzing their geochemical characteristics (GC of saturated hydrocarbons, GC-MS of saturated and aromatic hydrocarbons and isotopes) we determined that the two reservoirs are different oil and gas systems, which have the same oil source, experienced multiple stages of filling, and are correlated with each other. Combined with the research of fault activity timing and intensity, oil and gas vertical distribution, migration direction and charging period, we confirmed that the main forming stage of Silurian reservoir was in the late Hercynian, and the condensate gas reservoir in the Ordovician was formed during the Himalayan period. Fault activity intensity during the main accumulation period determined hydrocarbon accumulation strata and oil and gas properties in the area. We established a hydrocarbon accumulation mode of "hydrocarbon supply of vertical and lateral sources, vertical migration by faults, controlling layer by fault activity intensity, and optimal aggregation in lower traps".