松辽盆地朝长地区未熟、低熟烃源岩排烃研究

本文利用实验室模拟方法研究了松辽盆地朝(朝阳沟)长(长春岭)地区白垩系和外围汤元地区第三系低熟源岩的排烃过程,样品分别在150℃、200℃、250℃、300℃4个温度点各作一次实验。结果表明,低熟源岩的排烃过程具有“地质色层效应”,主要表现在排出烃与残留烃的族组成、气相色谱以及生物标志化合物等指标的差异上。本文计算并校正了模拟实验各温度点的排烃量和排烃效率,得出了朝长地区低熟源岩排烃效率与演化程度的经验公式。研究认为,低熟源岩排烃主要受源岩有机质丰度、类型、热演化成熟度及地下水活动等因素的影响。本区低熟源岩具有良好的生烃能力和排烃潜力,故具有良好的油气资源前景。

HYDROCARBON EXPULSION OF IMMATURE AND LOW-MATURE SOURCE ROCKS IN CHAOCHANG AREA OF THE SONGLIAO BASIN

In this paper,the hydrocarbon expulsion course of low mature source rocks from the Cretaceous of Chaochang area and the Tertiary of peripheral Tangyuan area in the Songliao Basin is studied by laboratory simulation.We experiment upon samples at 150℃,200℃,250℃ and 300℃,respectively.The results suggest that the geo chromatographic effects do exist during the hydrocarbon expulsion course of low mature source rocks,which are shown mainly by the differences of group composition,gas chromatogram and biomarkers between expelled and residual hydrocarbon.We also figure and correct the hydrocarbon expulsion quantity and efficiency in the simulation experiment at each temperature point,and obtain the experience formulation for the hydrocarbon expulsion efficiency and evolutionary degree of low mature source rocks in Chaochang area.It is considered that the hydrocarbon expulsion of low mature source rocks is mainly controlled by the abundance,types and thermal evolutionary maturity of organic matter and the movement of groundwater.The low mature source rocks of this area have good hydrocarbon generation capability and hydrocarbon expulsion potential,so they have good prospects for hydrocarbon resources.