松辽盆地古龙凹陷典型油气藏相态类型综合判别

Comprehensive discrimination of the phase state type of the typical oil and gas reservoirs in Qijiagulong sag in Songliao basin

油气藏相态类型的判别方法很多,对油气藏相态的认识每种方法所得结果一方面有各自的局限性,另一方面又有其不确定性.利用计算PVT相图法和5种常用的经验统计法(秩数法、Z值法、因子法、汽油比法和相对分子质量法),对4个代表性油气层的相态进行综合判别.结果表明,综合判别既可以相互验证,又可以全面认识油气藏相态信息;英51井和古109井的葡萄花油层为带油环中含凝析油凝析气藏.

There are many ways to determine the type of oil-gas reservoir phase. As to the knowledge of phase state of oil reservoir, on the one hand, the results of every method has its own limitation, on the other hand, has its own uncertainty. We may use the PVT phase diagram of calculation method and the five kinds of experience method (Order number method, Z value method, Factor method, comparison method between gas and oil , relative molecular quality method ) to make a comprehensive determination for the four representative oil and gas phase. The results show that the discrimination can be not only mutual test, but also the effective means of reliable and comprehensive understanding information of reservoir phase, the oil of the Putaohua oil reservoir of Ying 51 wells and Ying 109 wells involves the oil condensate reservoir and gas condensate reservoir.