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首页> 外文期刊>Journal of Petroleum Geology >BURIAL, TEMPERATURE AND MATURATION HISTORY OF THE AUSTRAL AND WESTERN MALVINAS BASINS, SOUTHERN ARGENTINA, BASED ON 3D BASIN MODELLING
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BURIAL, TEMPERATURE AND MATURATION HISTORY OF THE AUSTRAL AND WESTERN MALVINAS BASINS, SOUTHERN ARGENTINA, BASED ON 3D BASIN MODELLING

机译：基于3D盆地建模的阿根廷南部和西部马尔维纳斯盆地的水温，历史和历史

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This paper presents a numerical petroleum systems model for the Jurassic-Tertiary Austral (Magallanes) Basin, southern Argentina, incorporating the western part of the nearby Malvinas Basin. The modelling is based on a recently published seismo-stratigraphic interpretation and resulting depth and thickness maps. Measured vitrinite reflectance data from 25 wells in the Austral and Malvinas Basins were used for thermal model calibration; eight calibration data sets are presented for the Austral Basin and four for the Malvinas Basin. Burial history reconstruction allowed eroded thicknesses to be estimated and palaeo heat-flow values to be determined. Six modelled burial, temperature and maturation histories are shown for well locations in the onshore Austral Basin and the western Malvinas Basin. These modelled histories, combined with kinetic data measured for a sample from the Lower Cretaceous Springhill Formation, were used to model hydrocarbon generation in the study area. Maps of thermal maturity and transformation ratio for the three main source rocks (the Springhill, Inoceramus and Lower Margas Verdes Formations) were compiled. The modelling results suggest that deepest burial occurred during the Miocene followed by a phase of uplift and erosion. However, an Eocene phase of deep burial leading to maximum temperatures cannot be excluded based on vitrinite reflectance and numerical modelling results. Relatively little post-Miocene uplift and erosion (approx. 50-100 m) occurred in the Malvinas Basin. Based on the burial- and thermal histories, initial hydrocarbon generation is interpreted to have taken place in the Early Cretaceous in the Austral Basin and to have continued until the Miocene. A similar pattern is predicted for the western Malvinas Basin, with an early phase of hydrocarbon generation during the Late Cretaceous and a later phase during the Miocene. However, source rock maturity (as well as the transformation ratio) remained low in the Malvinas Basin, only just reaching the oil window. Higher maturities are modelled for the deeper parts of the Austral Basin, where greater subsidence and deeper burial occurred.
机译：本文介绍了阿根廷南部侏罗系-第三系（马加拉内斯）盆地的石油系统数值模型，其中包括附近马尔维纳斯盆地的西部部分。该建模基于最近发布的地震地层解释以及由​​此产生的深度和厚度图。来自澳大利亚和马尔维纳斯盆地25口井的测得的镜质体反射率数据用于热模型校准。提出了针对澳大利亚盆地的八个校准数据集和针对马尔维纳斯盆地的四个校准数据集。埋葬历史的重建可以估算出侵蚀的厚度，并可以确定古热流值。显示了陆上南方盆地和西马尔维纳斯盆地中井位置的六种模拟埋葬，温度和成熟历史。这些模拟的历史记录，与从下白垩统Springhill地层样品中测得的动力学数据相结合，被用于模拟研究区域的油气生成。编制了三个主要烃源岩（Springhill，Inoceramus和Lower Margas Verdes地层）的热成熟度和转化率图。模拟结果表明，在中新世期间发生了最深的埋藏，随后出现隆起和侵蚀。然而，根据镜质体反射率和数值模拟结果，不能排除导致最高温度的深埋始新世相。马尔维纳斯盆地中新世后隆起和侵蚀相对较少（约50-100 m）。根据埋葬和热史，最初的碳氢化合物生成被解释为发生在南方盆地的白垩纪早期，并且一直持续到中新世。预测在马尔维纳斯盆地西部地区也将出现类似的模式，白垩纪晚期为生烃早期，中新世则为后期。但是，马尔维纳斯盆地的烃源岩成熟度（以及转化率）仍然很低，仅到达油窗。对南部盆地深处较高的成熟度进行了建模，那里发生了更大的沉陷和更深的埋葬。

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