南极罗斯海盆地油气地质条件及资源潜力研究

罗斯海位于罗斯海湾北部、南极太平洋扇形区,该区域的罗斯海盆地是南极最具资源潜力的盆地之一,可进一步分为维多利亚地盆地、北部盆地、中央海槽和东部盆地四个次级单元。在对区域地层特征、地震地层特征进行总结归纳后,也分析了盆地的构造、沉积、温压及烃类地化条件,认为罗斯海盆地具有较好的油气地质条件。以二维地震、钻孔资料为基础,对盆地成熟度及生烃量进行了模拟。研究认为:东部盆地与维多利亚地盆地油气生成区均较广,但后者的源岩热演化程度较前者稍高,而中央海槽与北部盆地在油气生成区域及热演化程度方面均较差;根据生烃量模拟结果,同时选择合理的排聚系数,推测罗斯海盆地的地质资源量约为91.5亿吨。

GeologicalConditions and petroleum resource potential in the Ross Sea Basin,Antarctica

The Ross Sea is a deep bay located in the Pacific sector of the Antarctic. The Ross Sea Basin, which is divided into the Victoria Land Basin, Northern Basin, Central Trough, and Eastern Basin, constitutes one of the areas in the region with the most significant hydrocarbon potential. This study examined the regional stratigraphic and seismic characteristics, analyzed the conditions of the structures, deposition, temperature, pressure, and hydrocarbon geochemistry, and concluded that the hydrocarbon geological conditions are good. Based on two-dimensional seismic and borehole data, the maturity and hydrocarbon generating quantity were simulated. It is suggested that the oil and gas generation areas in the Eastern Basin and Victoria Land Basin are extensive, and that the thermal evolution gradation of the latter is slightly higher than the former. In comparison, the oil and gas generation areas and thermal evolution gradation of the Northern Basin and Central Trough are rather poorer. According to the simulation results of hydrocarbon generating quantity, and considering a reasonable accumulation coefficient, it is supposed that the potential hydrocarbon resources in the Ross Sea Basin are about 9.15 billion tons.