The application of the apatite fission track dating to the geothermal history in the northern piedmont zone of the Turpan depression, (Xinjiang)
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摘要: 笔者应用磷灰石裂变径迹法对吐鲁番坳陷北部山前带的地质热历史进行了综合研究。重点对恰1井、照2井、大步1井的裂变径迹测试结果进行研究,得出北部山前带总体上磷灰石裂变径迹表观年龄随温度增高而逐渐减小,北部山前带的地温梯度古高今低和东高西低的认识。研究结果表明,三叠纪、侏罗纪的烃源岩在侏罗纪开始成熟,两套烃源岩均在侏罗纪末期达生烃高峰,从而得出北部山前带可成为油气勘探可选区的结论。Abstract: The geothermal history in the northern piedmont zone of the Turpan depression is treated by using the apatite fission track dating, with the emphasis on the Qia-1, Zhao-2 and Dabu-1 wells. The analyses show that the apatite fission track apparent ages are generally decreased with the increase of temperatures, and that the geothermal gradients display the trend of being higher in ancient times and lower in modern times, and higher in the eastern part and lower in the western part of the piedmont zone. The Triassic and Jurassic source rocks got matured during the Jurassic and went up to the maximum hydrocarbon production during the latest Jurassic. It follows that the northern piedmont zone of the Turpan depression may be selected as a prospective area of oil and gas.
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Keywords:
- Turpan depression /
- apatite fission track dating /
- geothermal gradient /
- source rock /
- Xinjiang
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