松辽盆地梨树断陷高-过成熟烃源岩生烃潜力评价

Hydrocarbon generation potential evaluation of high and over matured source rocks in Lishu fault depression,Songliao Basin

为准确认识松辽盆地梨树断陷高-过成熟烃源岩生烃潜力,有效推动梨树断陷油气勘探,笔者结合梨树断陷烃源岩发育特征,在梨树断陷双龙次凹优选低成熟烃源岩样品,开展地层孔隙热压模拟实验,建立了高-过成熟烃源岩有机碳恢复系数曲线和产烃率曲线,重新落实梨树断陷不同层系优质烃源岩空间展布特征和生烃潜力。结果表明,梨树断陷高-过成熟烃源岩有机碳恢复系数为1.4~2.4,总产烃率为(320~500)mg/g.TOC,总生烃量达33821×106t油当量,其中沙二段为最主要的生烃层系,主力生烃区位于梨树断陷中部的洼陷带及其临近的八屋-十屋、东部斜坡、北部斜坡和小宽南地区。

To evaluate the hydrocarbon generation potential of the high and over matured source rocks,and promote oil and gas exploration effectively in Lishu fault depression,Songliao Basin,the samples of low mature hydrocarbon source rocks from Shuanglong sub-depression in Lishu fault depression are collected according to the characteristics of source rocks.Then high temperature and pressure simulation experiments on the formation porosity are carried out,the organic carbon restoration coefficient curve and hydrocarbon yield of high and over matured source rocks are established,and the spatial distribution and hydrocarbon generation potential of high quality source rocks in different layers of Lishu fault depression are implemented.The results show that the organic carbon restoration coefficients of high and over matured source rocks in Lishu fault depression range from 1.4 to 2.4,the total carbon yield ranges from 320 to 500 mg/g.TOC.Total hydrocarbon generated is 33821×106 t(oil equivalent).Sha-2 Member is the most important hydrocarbon generation layer.The major hydrocarbon generation areas are the central depression belt of Lishu fault depression and the adjacent areas,including Bawu-Shiwu,eastern slope,northern slope and southern Xiaokuan area.