Late Mesozoic Comparative Research on the Geothermal Field of the Ordos Basin and Qinshui Basin
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摘要: 鄂尔多斯盆地和沁水盆地都为大型的沉积盆地，中间以吕梁隆起相隔开。本文通过镜质体反射率、磷灰石裂变径迹、包体测温等古地温研究方法确定了鄂尔多斯盆地和沁水盆地中生代晚期的古地温梯度和古大地热流，鄂尔多斯盆地为３.３～４.３℃/１００ｍ及８１～９５ｍＷ/ｍ２，沁水盆地为６.１℃/１００ｍ及１０６ｍＷ/ｍ２。沁水盆地和鄂尔多斯盆地古地温梯度和大地热流值都较高且沁水盆地高于鄂尔多斯盆地说明中生代晚期存在一次构造热事件，构造热事件发生在晚侏罗世—早白垩世。这次构造热事件提高了气源岩的热演化程度，加速了天然气的形成。Abstract: The Ordos basin and Qinshui basin, separated by the Iia lung uplift, are all large sdlimerto rybasins. It was detererned by many methods of vitrinite reflectance apatite fission track and fluid inclu-sign that paleogeothermal gradient and heat flow are 3.3-4.3℃/100 m and 81-95 m W/2in the Or-dos basin, 5.8℃/100 m and 106 m W/2in the Qinshui basin, and the Qinshui basin is higher is thesevalues than the Ordos basin. Those facts showed that there was a tectonic一hermal event in Late Meso一wic which occurred from Late Jurassic to Early Cretaceous. this tectoni cthermal event increased ther-mometamorphic degree of Palaeowic gas source rocks and ac elerated gas generation.
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Key words:
- Ordos basin /
- Qinshui basin /
- thermal event /
- paleogeothermal field
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