摘要
目的恢复苏北盆地古地温场,进行热演化史研究,确定主要的生烃时期。方法在盆地演化史分析的基础上,应用镜质体反射率、包裹体分析等技术。结果苏北盆地新生代具有多旋回盆地演化的特点,地温梯度呈降低趋势,古近纪40～45℃/km,新近纪30℃/km左右;烃源岩演化经历了早期生烃、中期生烃停滞、晚期生烃3个阶段。结论烃源岩成熟度主要受古地温场的控制,而与现今地温梯度无关;渐新世持续18Ma的三垛抬升运动是造成苏北盆地烃源岩演化程度低的主要原因。
Aim To reconstruct the paleotemperature and thermal history of north Jiangsu Basin,obtain the time of petroleum generating.Methods Based on the analysis of sedimentary evolution and burial history, methods of vitrinite reflectance,geotemperature log and inclusion analysis have been applied. Results It had characteristics of multi-cycle evolution and debasing geothermal field during Cenozoic with a high paleo-thermal gradient of 40~45 ℃/km from Paleocene to Eocene, and a lower paleo-thermal gradient of 30℃/km in late tertiary in north Jiangsu Basin. The resource rocks reached peak temperature and generated hydrocarbon mainly in Eocene. Conclusion The maturity of resource rock is controlled by the paleo-thermal field and is independent of the geothermal gradient of nowadays. The lifting movement of Sanduo lasting for 18Ma is the main factor of the lower maturity of source rocks in north Jiangsu Basin.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2005年第2期195-199,共5页
Journal of Northwest University（Natural Science Edition）
基金
山东省自然科学技术基金资助项目(Y2000F01)
关键词
苏北盆地
地温场
镜质体反射率
热演化史
north Jiangsu Basin
geotemperature
vitrinite reflectance
thermal history
