摘要
为了研究沁水盆地构造热演化史,需要恢复不同地史时期的古地温梯度、煤系古地温和古埋深。在分析研究各种已有方法优缺点的基础上,根据沁水盆地的实际,总结出了一套较为完善的恢复地热史的方法:即以现今地温梯度将今论古,通过古地温计多重验证,不但考虑到地壳的冷却系数、不同构造单元内的区域地热场特征和差别,同时也将岩石的热物理性质体现到模式中去。根据恢复的地热史,模拟计算了镜煤反射率值。经与实测镜煤反射率值对比发现,计算值与实测值基本近似。说明这一方法可以恢复地史各个时期的古地温梯度及煤系古地温,同时大大提高了古地温梯度的精确度和可信度。
To study tectonic thermal evolution history in the Qinshui Basin, need to recover paleogeothermal gradient, coal measures pa- leogeotemperature and paleo-buried depth during different geological times. On the basis of available method merits and faults assess- ment, according to the reality of Qiushui Basin, summarized a set of relatively perfect methods to recover geothermal history. Taking the present geothermal gradient to infer paleogeotemperature, through paleogeothermometer multiple authentication, not only has consid- ered earth crust cooling factor, regional geothermal field features and difference between different tectonic elements, but also embodied the rock thermophysical properties into the model. Based on recovered geothermal history, has simulatively computed vitrinite reflec- tance values. Through comparison with measured values have found they are basically approximate. Thus, the method can recover vari- ous geological times paleogeothermal gradient and coal measures paleogeotemperature, and moreover can greatly improve paleogeother- real gradient accuracy and reliability.
出处
《中国煤炭地质》
2017年第3期10-14,共5页
Coal Geology of China
基金
国家油气重大专项(ZX20160241)--临兴-神府地区煤系地层煤层气
致密气
页岩气合采示范工程-产层组压裂裂缝穿层致裂模拟技术研究
关键词
沁水盆地
构造热演化史
地热史
Qinshui Basin
tectonic thermal evolution history
geothermal history
