摘要
本文介绍了裂变径迹法的基本原理、退火机理及其在盆地分析中的应用。最常用于该方法的磷灰石及锆石是广泛分布于沉积岩中的矿物,其退火温度与石油生成的温度范围有关。磷灰石退火带大致相应于低熟-成熟原油阶段,其完全退火温度一般为125°C。除径迹密度(表观年龄)外,径迹长度及其分布的变化也与古地温有关。该方法与其它地温常数相结合,可用以确定冷却事件(上升剥蚀)和与岩浆、热液活动有关的热事件的时间及强度。文中列举了我国塔里木盆地以及以色列南部Ramon 1井资料说明它们的应用。
This paper expounds the principles of the fission-track method (AFT A), mechanism of the annealing and its application to sedimentary basin analysis. Apatite and zircon, most commonly used in this method, occur as general minerals in many sedimentary rocks. Their geological annealing temperatures span the main temperature range for oil generation. The annealing zone of apatite responds to the stage of low-middle mature oil. In addition to the density of fission tracks (apparent age), the change of their length and distribution can provide the information of paleotemperature. Combined with other parameters of maturation, AFTA is useful in estimating the cooling event (uplift erosion) and thermal event relevant to intrusion and liquid movement. Two examples are briefly illustrated to show its application to the study of thermal history of basins: Talimu basin in China and Ramon 1 well in Southern Israel. As a quantitative indicator of paleotemperature, AFTA will find wider application in Hydrocarbon exploration.
出处
《地质科技情报》
CAS
CSCD
北大核心
1991年第4期83-88,共6页
Geological Science and Technology Information
