准噶尔盆地热演化历史模拟
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摘要
根据磷灰石裂变径迹和镜质体反射率（Ｒ。）动力学模型模拟了准噶尔盆地腹部莫索湾、陆南和盆地南缘等地区的地温演化历史。研究结果表明，尽管准噶尔盆地现今的地温较低，但由于受构造运动的影响，各地质历史时期的地温演化不同，盆地的古地温较现今地温高。特别是在古生代和三叠纪，地温梯度很高。古生代的地温梯度平均大于３８℃／ｋｍ，中生代三叠纪的地温梯度仍很高，为３４．６－４１℃／ｋｍ．侏罗纪的地温梯度变化较大，这可能与该时期的构造运动频繁有密切关系。白垩纪以后盆地的地温梯度演化基本不变，与现今相当。
Based on the apatite fission radial symptom and dynamic model of vitrinite reflectance (Ro),the simulation of geothermal evolution history in hinterland areas as Mosuowan and Lunan and southernmargin of Junggar basin was made. Study showed that in spite of relatively low geothermal temperaturenowadays in Junggar basin, the geothermal evolution varied from time to time in each geologic history period with higher paleogeotherm than present geotherm, particularly in Paleozoic and Triassic due to the effeCt of tectonic movements. The average geothermal gradient of Paleozoic was up to 38 ℃/km or above,that of Triassic arranged from 34.6 ℃/km to 41 ℃/km. In Jurassic it was still changing considerably,which was probably due to frequent tectonic movements. Following Cretaceous, it tended to be stable ingeneral and similar with present geothermal gradient.
Based on the apatite fission radial symptom and dynamic model of vitrinite reflectance (Ro),the simulation of geothermal evolution history in hinterland areas as Mosuowan and Lunan and southernmargin of Junggar basin was made. Study showed that in spite of relatively low geothermal temperaturenowadays in Junggar basin, the geothermal evolution varied from time to time in each geologic history period with higher paleogeotherm than present geotherm, particularly in Paleozoic and Triassic due to the effeCt of tectonic movements. The average geothermal gradient of Paleozoic was up to 38 ℃/km or above,that of Triassic arranged from 34.6 ℃/km to 41 ℃/km. In Jurassic it was still changing considerably,which was probably due to frequent tectonic movements. Following Cretaceous, it tended to be stable ingeneral and similar with present geothermal gradient.
引文
[1]刘国壁,张惠蓉.准噶尔盆地地热场特征与油气[J].新疆石 油地质,1992,13(2):99-107.
[2]王钧,黄尚瑶,黄歌山.中国地温分布的基本特征[M].北 京:地震出版社,1990.
[3]张惠蓉,宋运维.火烧山油田地热流值测定[J],新疆石油 地质,1993,14(4):314-317.
[4]周中毅,潘长春.沉积盆地古地温测定方法及其应用[M]. 广州:广东科技出版社,1992.
[5] Laslett G M, Green P F. Thermal annealing of fissiontrack in apatite. 3. Variable temperature behaviour [J].Chemical Geology. 1987, 73: 25-38.
[6] Sweeney J J, Burnham A K. Evaluation of a simplemodel of vitrinite reflectance on chemical kinetics [J].AAPG. 1990: 1559~1571.
[7] Sweeney. BASINMAT--Fortran program calculates oil andgas generation using a distribution of discrete activationenergies[J]. Geobyte, 1 990, 15(2): 3 7 ~43.
[2]王钧,黄尚瑶,黄歌山.中国地温分布的基本特征[M].北 京:地震出版社,1990.
[3]张惠蓉,宋运维.火烧山油田地热流值测定[J],新疆石油 地质,1993,14(4):314-317.
[4]周中毅,潘长春.沉积盆地古地温测定方法及其应用[M]. 广州:广东科技出版社,1992.
[5] Laslett G M, Green P F. Thermal annealing of fissiontrack in apatite. 3. Variable temperature behaviour [J].Chemical Geology. 1987, 73: 25-38.
[6] Sweeney J J, Burnham A K. Evaluation of a simplemodel of vitrinite reflectance on chemical kinetics [J].AAPG. 1990: 1559~1571.
[7] Sweeney. BASINMAT--Fortran program calculates oil andgas generation using a distribution of discrete activationenergies[J]. Geobyte, 1 990, 15(2): 3 7 ~43.
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