塔里木盆地塔河油田原油中生物标志化合物成熟度指标特征与石油运移

The Biomarker Maturity Parameters and Migration for Oils from Tahe Oilfield in Tarim Basin

塔河油田是我国迄今为止在古生界海相碳酸盐岩层系中发现的最大的油气田,研究其中油气的运移是了解这种油气藏形成规律的重要环节。对塔河油田近几年开采的油井原油样品进行系统采集后,分析了原油中生物标志化合物,选取Ts/(Ts+Tm)、三环萜烷/17α(H)-藿烷和重排甾烷/规则甾烷比值作为油气运移指标,研究了塔河油田原油的运移特征。结果表明,这些指标反映了塔河油田奥陶系原油运移有两个方向,一个是由东向西,另一个是由南向北;9区和三叠系、石炭系原油成熟度较高,说明它们成藏期较晚。

The Tahe oilfield is the largest oilfield discovered in Paleozoic marine carbonate rock layers up to now. The oil migtation study can understand the genetic mechanism of the kind of the oil pool. We systematacially collect the oil samples from Tahe oilfield wells developed recent years and analyze biomarkers in the oils. The ratios of Ts/ （ Ts ＋ Tm）, tricyclic terpane to 17α（H） -hopane and rearrangement sterane to regular tion parameters. The studied results show that these parameters reflect the charging from the east of the oilfield to the west and partially from the south of the oilfield to sterane are chosen as oil migradirection of the crude oil is mainly the north for oils from the Tahe oilfield oil. The maturity of District 9 and Triassic and Carboniferous oils is higher than other oils. These indicate that the formation stage of the oil pool is later.