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鄂尔多斯盆地剥蚀厚度恢复及其对上古生界烃源岩热演化程度的影响
高胜利 任战利
摘 要:运用镜质体反射率-深度剖面恢复出鄂尔多斯盆地中生界地层的剥蚀厚度,并结合烃源岩加热降温热模拟实验研究上古生界烃源岩的热演化特征.研究认为,反射率-深度剖面模型可分为3类,即单段式、双段式和三段式.盆地东部剥蚀厚度大,为1400~2 200 m;西部剥蚀厚度小,为400~1 000 m.据烃源岩时温互补热演化模拟实验,岩样在加热到一定温度后降温,随时间增加Ro值虽在增加,但Ro值增加速率不断降低,且在相同时间段内,降温幅度越大,生烃能力越低,当降温到一定程度时,随时间增加,生烃能力非常小.表明了源岩受热的时间尺度与热效应之间,温度起着主导作用.由于中东部剥蚀厚度远大于烃源岩热演化停滞时的最小剥蚀厚度,烃源岩热演化作用已处于停滞状态,西部剥蚀厚度较小的布1-天1地区,烃源岩的热演化作用在新生代仍有可能继续缓慢进行.
关键词:镜质体反射率;热事件;剥蚀厚度;鄂尔多斯盆地
分类号:TE122.9 文献标识码:A
文章编号:0253-9985(2006)02-0180-07
Restoration of eroded thickness and its influence on thermal evolution of Upper Paleozoic source rocks in Ordos basin
Gao Shengli Ren Zhanli
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基金项目:国家重点基础研究发展规划(973)项目(2003CB2146000);长江学者和创新团队发展计划资助项目(IRT0559)
作者简介:高胜利(1974-),男,博士生,盆地分析与油气藏评价
作者单位:高胜利(西北大学,地质学系,大陆动力学国家重点实验室,陕西,西安,710069;中国石油,长庆油田分公司勘探开发研究院,陕西,西安,710021)
任战利(西北大学,地质学系,大陆动力学国家重点实验室,陕西,西安,710069)
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