摘要
利用磷灰石构造-热年代学年龄、有机质成熟度指标、磷灰石裂变径迹热史模拟和单井EASY%Ro反演等方法,对新疆库鲁克塔格地区盆山系统开展盆山构造-热演化史研究。结果表明,磷灰石年龄记录了早白垩世（99~124.4 Ma）、晚白垩世（66~87 Ma）和古近纪（28.4~63 Ma）3次抬升过程;有机质成熟度指标和磷灰石裂变径迹热史模拟反映出海西期构造抬升过程。单井热史模拟表明,孔雀河斜坡下古生界烃源岩在志留纪末-早泥盆世到达最大热演化程度,模拟最大古地温梯度为3.56℃/100 m,侏罗纪末古地温梯度为3.1℃/100 m,焉耆盆地南部凹陷侏罗纪晚期模拟最大古地温梯度达4.15℃/100 m。海西期剧烈的造山运动使孔雀河斜坡由沉积转入剥蚀演化阶段,对油气成藏具有重要意义,晚白垩世隆升使孔雀河斜坡及焉耆盆地侏罗纪烃源岩热演化停止。
Based on the apatite fission track thermochronology,organic matter maturity index,apatite fission track thermal modeling and well-EASY%Ro inversion data,tectonic-thermal evolution history in the Kuruketage areas were investigated.The apatite fission track thermochronology shows that Kuruketage uplift underwent three periods of tectonic movements,the Early Cretaceous（99-124.4 Ma）,the Late Cretaceous（66-87 Ma） and the Early Tertiary（28.4-63）.Organic matter maturity data and apatite fission track thermal modeling reflect a Hercynian tectonic movement.Well-modeling demonstrates that Palaeozoic source rocks in the Kongquehe slope reached maximum thermal evolution from the Late Silurian to the Early Devonian with maximum paleo-geothermal gradient of 3.56 ℃/100 m.Paleo-geothermal gradient was 3.1 ℃/100 m in the Late Jurassic and 4.15 ℃/100 m in the south depression of the Yanqi Basin in the Late Jurassic.The Kongquehe slope was transferred from deposition to erosion owing to the strong Hercynian tectonic movements,which is important to oil-gas accumulation.Thermal evolution of the Jurassic source rocks in the Kongquehe slope and Yanqi Basin stopped because of the Late Cretaceous uplift.
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2011年第3期33-41,共9页
Earth Science Frontiers
基金
国家重点基础研究发展计划"973"项目(2003CB214605)
国家科技重大专项(2008ZX05005-004-08HZ)
