The relations of hydrocarbon generation to the geochemical features and maturity evolution of source rocks in Sartai Sag, Yabrai Basin
摘要: 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(180.0 Ma)至晚侏罗世末期(140.0 Ma),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(100.0 Ma)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.Abstract: Based on the description of a large number of geochemical parameters and thermal evolution simulation technique, the geochemical features and maturity evolution of Middle Jurassic source rocks in Sartai Sag,Yabrai Basin, and its relationship with hydrocarbon accumulation, were analyzed. The analysis results show that ①Depression center: The source rocks from J2q are mainly type Ⅲ in middle-high mature stage, and it can be a potential gas source because of the large buried depth. And that from J2x1 are generally medium-good source rocks in medium-high maturity(mostly type Ⅱ2-Ⅲ),can be a good oil source.②Slope area: The medium-good source rocks from J2q (mixed type Ⅰ-Ⅲ)and J2x1 (mostly type Ⅱ1-Ⅱ2) are both in medium-high maturity, can be a good oil source also. ③Heisha low uplift: The source rocks from each atrata have a poor oil-generating potential because of the low abundance of organic matter,but the tectonic position is advantageous to the formation of anticline trap reservoir. The source rocks from J2x2 are generally poor with low mature that it only can be as the reservoir of oil and gas from the lower strata after vertical migration. The source rocks from J2q and J2x1experienced a very fast process of maturity evolution and achieved to the mature stage during the early stage of Middle Jurassic(180.0 Ma) to the end of Late Jurassic(140.0 Ma), and it was the critical stage of hydrocarbon generation. In addition, the slope areas reached the largest buried depth in the late Early Cretaceous and it was the second critical period of hydrocarbon generation in slope areas.
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