四川盆地区域地温场的特征

根据钻井测温数据及前人研究结果,编制了四川盆地1000,2000,3000和4000m四个特定深度的等温线图,以及中、新生界陆相地层地温梯度等值线图。通过对该区岩心放射性含量数据的搜集和样品的测定、地层生热率的统计和热导率的估计,并且辅助数值模拟计算,认识到四川盆地区域地温场的特征与本区区域构造特征相关,除此以外,个别局部地温较高地段可能还与基底中放射性元素的局部富集有关。

THE CHARACTERISTICS OF THE REGIONAL GEOTHERMAL FIELD IN SICHUAN BASIN

The isotherm maps showing the temperatures at depth of 1000m, 2000m, 3000m, and 4000m, respectivelyand the geothermal gradient map of the Mz-Kz layers have been compiled based on the data obtainedfrom temperature measurement of boreholes drilled for oil and gas and some preceding researches. With the measurement of the radioactive contents of core samples, the statistics of the heat productionin the layers and the estimation of the conduction of the rock, as well as necessary numerical simulation,the investigation shows that the temperature distribution in Sichuan Basin is interrelated to the regionalstructure. In addition, some local anomalies with rather high temperature are due to the heat released fromthe radio-elememts which are probably concentrated in the basement locally.