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基于大量地球化学参数精细描述,利用热演化模拟技术,分析雅布赖盆地萨尔台凹陷中侏罗统烃源岩地球化学特征、成熟度演化及其与油气的关系.分析结果表明:1凹陷沉积中心,J2q以中-高成熟Ⅲ型烃源岩为主,埋藏深度大,可成为潜在有利气源;J2x1为Ⅱ2-Ⅲ型中成熟中-好烃源岩,为有利油源区;2斜坡带,J2q、J2x1分别为Ⅰ-Ⅲ混合、Ⅱ1-Ⅱ2型中成熟中-好烃源岩,为有利油源区;3黑沙低凸起,各组烃源岩有机质丰度较低,生油潜力一般,但构造位置有利于形成背斜圈闭油藏.J2x2为差生油岩,普遍分布萨尔台凹陷全区,且热演化程度低,只能作为下部油(气)源经垂向运移后的储集体.中侏罗世早期(180.0Ma)至晚侏罗世末期(140.0Ma),J2q、J2x1烃源岩快速经历了多阶段演化并达到中高热演化程度,是有机质大量向油气转化的关键阶段.另外,早白垩世末(100.0Ma)斜坡带达到最大埋深,成为该区域烃源岩成熟演化的第二个关键时期.
Based on the detailed description of a large number of geochemical parameters, the geochemical characteristics and maturity evolution of the Middle Jurassic source rocks in the Saertai Sag of the Yabrei Basin are analyzed by means of thermal evolution modeling. The results show that: In the sedimentary center, J2q is mainly medium-high maturity type III source rock with a large burial depth, which may be a potential favorable gas source. J2x1 is a medium-maturity medium-moderate source rock of type II-III, In the slope zone, J2q and J2x1 are Ⅰ-Ⅲ mixed and moderately mature medium-well source rocks of type Ⅱ1-Ⅱ2, respectively, which are favorable oil source areas. 3 The low density of the black sandstone has lower organic matter abundance in each source rock, The potential for oil generation is normal, but the tectonic location is favorable for the formation of anticline trap oil reservoirs. J2x2 is a poor source oil rock and generally distributes in the entire Salliant depression with low thermal evolution and can only be used as the source of lower oil and gas To the post-migration reservoirs, the J2q and J2x1 source rocks rapidly experienced multi-stage evolution and reached mid-high thermal evolution in the early Middle Jurassic (180.0Ma) to late Late Jurassic (140.0Ma) To the key stage of oil and gas transformation.In addition, at the end of the Early Cretaceous (100.0Ma), the slope reaches the maximum depth and becomes the region Mature source rock evolution of the second critical period.