The thermal evolution of the Mawson Sea Basin, offshore East Antarctic, was modelled using the GALO basin modelling programme. As there exist no deep temperature or vitrinite reflectance data for the Mawson Sea Basin, the simulation was based on a limited nonthermal database. This includes the present‐day sedimentary section along a multichannel seismic profile which crosses the western part of the Mawson Sea along with geophysical assessments of the depth of the Moho. An analysis of the variations in tectonic subsidence was used to estimate the duration and magnitude of thermal activation or stretching of the lithosphere. This analysis suggested that a proportion of the lithospheric stretching took place before the start of synrift sediment deposition at about 160 Ma (Late Jurassic). This pre‐sedimentation lithospheric stretching has been ignored in previous studies, resulting in significant underestimation of the total stretching which has occurred. The analysis also suggests that the thermal maturity of Lower Jurassic potential source rocks along the profile may reach and even exceed the onset of the oil generation window, whereas source rocks in less deeply buried parts of the profile are less mature. In general, the results of the modelling indicate that the Mawson Sea Basin is a promising area for future oil and gas exploration.

中文翻译：

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使用GALO系统对澳大利亚-南极接合边缘进行数值模拟：第2部分。东南极莫森海盆地的热和演化历史

使用GALO盆地建模程序对南极东部莫森海盆地的热演化进行了建模。由于不存在莫森海盆地的深层温度或镜质反射数据，因此该模拟基于有限的非热数据库。这包括当今沿多通道地震剖面的沉积剖面，该剖面横穿莫森海的西部，以及对莫霍面深度的地球物理评估。通过对构造沉降的变化进行分析，以估算岩石圈热活化或伸展的持续时间和幅度。该分析表明，在大约160 Ma（侏罗纪晚期）开始进行过速沉积物沉积之前，岩石圈伸展发生了一定比例。这种沉积前的岩石圈伸展在以前的研究中被忽略了，导致对已发生的总伸展的估计大大低了。分析还表明，沿着剖面的下侏罗统潜在烃源岩的热成熟度可能达到甚至超过产油窗口的开始，而在埋藏较浅的部分的烃源岩则较不成熟。通常，建模结果表明，莫森海盆地是未来油气勘探的有希望的地区。而埋藏在该剖面较不深处的烃源岩则较不成熟。通常，建模结果表明，莫森海盆地是未来油气勘探的有希望的地区。而埋藏在该剖面较不深处的烃源岩则较不成熟。通常，建模结果表明，莫森海盆地是未来油气勘探的有希望的地区。