Reveal the Multi Stage of Burial and Tec-thermal History of the North-west Edge of Jianghan Basin,Ce

来源 :2013年博士后学术论坛——油气成藏理论与勘探开发技术 | 被引量 : 0次 | 上传用户:zxwlxy
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  Apatite and zircon fission track analysis, vitrinite reflectance data and thermal modeling are earned out in this study for reconstructing the tectonic and thermal history of the northwest edge of Jianghan Basin,central China.The apparent ages of the apatite fission track range from 54Ma to 9.8Ma, with the mean track length varies from 12 3 ±2.3μm to 10.5 ±2.3μm, suggesting that all the samples have experienced a partial or even total reset during the Cenozoic.By comparing the results of zircon fission track testing (128-108Ma) with the depositional age and the uranium content of the grains analyzed, the result proves that the samples have passed the partial annealing zone of zircon fission track during the Mesozonic.Combining the fission track data with the strata data of well drilling, the study area has experienced significant deeply-buried heating and uplift cooling process twice: the first time occurred during the Mesozoic associated with the Yanshan tectonic movement and the second time took place during the Cenozoic associated with the Himalaya tectonic movement.The anomalous results of vitrinite reflectance value also show evidence of these two processes.The analysis results shows that the maximum temperature that the later Triassic and Lower Jurassic experienced is ~ 205 ± 18℃ and the maximum thickness is ~4400-5400m; the timing for the tectonic uplift erosion and cooling happened in Mesozoic began at the early Cretaceous (~140-130Ma) rather than the end of the later Jurassic.Contrarily, there should be enormous middle-latter Jurassic, even early Cretaceous sediments deposited in the study area (~ 4800-5800m).The maximum temperature of Paleogene strata is ~ 108℃ and ~ 145℃ for these two wells, the time of tectonic uplift in Himalaya Epoch is ~48Ma, the cooling could be divide into rapidly-slowly-rapidly three stage.The whole erosion thicknesses are ~4400-5400m and ~ 2600-3400m of the two processes, respectively.
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