Application of fluid inclusion to determination of times and process of hydrocarbon accumulation in Beier depression, Hailaer basin

摘要

The high production of oil in well bei16 well marked a breakthrough in petroleum exploration of Beier depression, Hailaer Basin. The source rocks in Beier depression are studied synthetically and qualitatively by the analytical data of samples from drilling cores. The result shows the lower Cretaceous Nantun formation source rocks including rock type, organic abundance, organic type and the level of organic evolution are much better than other formations. In Nantun formation the organic abundance is higher (TOC > 1.8%, and S1+S2>6mg/g), the organic types mainly include sapropel type and humic-sapropel (typeⅠ-Ⅱ)but the organic evolution vary widely from different tectonic parts. In the west and center fault-depression of Beier this rocks are locating in oil window. The correlation of source rock and oil indicated that Nantun formation is the mainly source.