摘要
简述了裂变径迹年代法的原理,以美国和澳大利亚的研究实例讨论了它在盆地地热史研究中的应用,并对康铁笙等人的裂变径迹资料进行了重新解释。对其裂变资料的重新解释表明,1600-2550m为未退火带,径迹年龄均大于地层的沉积年代,说明磷灰石颗粒的母岩主要是晚白垩纪和第三纪火山岩;2550-3600m为部分退火带;3600-4100m为冷却带,推测最迟大约在晚第三纪末(2.2百万年前)出现了一期冷却事件,温度下降了13℃或更多。这个结论与古地温研究结果吻合。部分退火带与冷却带位于渤海湾盆地的主要生油带内,表明可用磷灰石裂变径迹法研究含油气盆地的地热史。
The theory of the fission-track dating is demonstrated simply and its application to the analysis of the thermal history of sedimentary basins is illustrated by case studies in USA and Australia. The fission-track data from Kang et al are reinterpreted. Reinterpretation indicates that a zone of annealing is located at a depth of 1600-2550 meters, a zone of partial annealing at 2550-3600 meters and a zone of cooling at 3600-9100 meters respectively. It is concluded that the parent rocks for appatites come from volcanic rocks of late Cretaceous and Tertiary and that the latest phase of cooling was initiated at the end of Tertiary(2. 2 Ma ago)approximately at least, and involved a decrease in temperature of at least 13 degree C. The last conclusion is consistent with the results from paleotemperature studies. Both the zone of partial annealing and the zone of cooling are within the main zones of oilgeneration in Bohai Bay Basin, showing that the fission-track method is really suitable for the analysis of the thermal history of petroliferous basins.
出处
《石油学报》
EI
CAS
CSCD
北大核心
1992年第4期1-9,共9页
Acta Petrolei Sinica
