Abstract
Geothermal field has an important influence on hydrocarbon accumulation. The geotemperature field in Qingyang area is studied by vitrinite reflectance and homogenization temperature of inclusions. The results show that the average geothermal gradient in Qingyang area is about 2.8 °C/100M, which is close to the median value of global average heat flow. It belongs to the medium temperature type geothermal field. In Qingyang area, the geothermal gradient is low from Paleozoic to early Cenozoic, ranging from 2.2 °C to 3.0 °C/100M, rising to 3.3-4.3 °C/100m in the late Mesozoic, and gradually decreasing to 2.8 °C/100M since Cenozoic. Generally speaking, high temperature field is favorable to the formation of petroleum system, and vice versa.
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