Study on discharge history of well LN2 in Lunnan area, Tarim basin: the evidence from fluid inclusion.

Lunnan oil field occupies 78% of proved reserves in the Lunnan area. The dr ill hole LN2 is the first preliminary exploratory well on high location of the NO. 2 structure belt in Lunnan bury hill. It also is the important indu strial oil flow well. The main producing formation is Triassic reservoir. T here are three oil groups: T-I, T-II and T-III oil groups. The later is a J urassic reservoir. The distribution of organic inclusion is observed by opt ics and fluorescence microscope. Composition of organic inclusion is obtain ed by GC and GC-MS. On the base of structure evolution, burial history, hyd rocarbon generation and study on organic inclusion, we confirm that Triassi c oil pool has only one large scale discharge. Petroleum displacement is ma in vertical, migration. Its time is 14 similar to 16Ma and oil comes from O rdovician hydrocarbon source rocks. Jurassic oil pool have two discharge st ages. The early one is in 14 similar to 16Ma. Tt has the same source rocks as Triassic oil pool. The later one took place about 5Ma ago. It is redisch arge along flauts being opened again.