沉积盆地有机质自由基热演化特征及其作为古温标的探索

The Thermal Evolution of Free Radicals in Organic Matter in Sedimentary Basins:a Possible Geothermometer

恢复沉积盆地热历史的方法主要有古地温指标法和动力学模拟法两类。古温标法中最常用的为有机质成熟度和矿物裂变径迹,动力学模拟法中最常用的是盆地的拉张模型和挤压模型。本文针对Ⅰ型有机质自由基浓度作为沉积盆地古温标进行了探索研究。分析了自然演化系列Ⅰ型有机质的自由基的热演化特征;根据自然演化系列的Ⅰ型有机质自由基浓度及时间-温度指数(TTI)数据,对热模拟实验下的Ⅰ型有机质自由基浓度及时间-温度指数(TTI)值进行校正,由校正后的数据初步建立了Ⅰ型有机质的自由基浓度(Ng)与时间-温度指数(TTI)的定量模型。

The methods to reconstruct thermal history of basins are divided into two types, paleotemperature scales and thermal dynamics of basin. The most popular paleotemperature indices include maturity of organic matter and fission track of minerals. The thermal dynamics models of basins include lithosphere stretch model and compressional model. This paper studies the free radicals concentrated in type I organic matter as a thermal indicator in sedimentary basins. The thermal evolution characteristic of the free radical in type I organic matter of the samples was analyzed. Based on free radical concentration （Ng） and time- temperature index （TTI） data of the geological type I organic matter samples, the data of the thermal simulation type I organic matter samples are corrected. Then the quantitative model Between free radical concentration （Ng） of organic matter and time-temperature index （TTI） for type I organic matter was obtained according to the data of the corrected thermal simulation samples.