Reevaluation of hydrocarbon resource potential in Nanwu sag of the South Yellow Sea basin: based on the numerical modeling method of hydrocarbon generation kinetics
南黄海盆地南部坳陷南五凹至今无商业油气发现,前人对其油气资源前景的评价也较差,而邻区与其地质背景相似的苏北盆地高邮凹陷截至2011年底已发现探明石油地质储量2亿t。为了进一步阐明南五凹的油气资源潜力,采用目前国际上通用的生烃动力学方法模拟烃源岩的生排烃史。通过烃源岩岩屑和原油沥青质样品的热模拟实验数据计算生烃动力学参数,并以原油储量的成熟度分布数据进行验证。研究结果表明,南五凹阜宁组烃源岩的生烃活化能仅为209 k J/mol,低于典型湖相烃源岩的生烃活化能,烃源岩在低熟阶段就可以大量生烃,具有早生、早排的特点;南五凹的排烃量可达29.5亿m~3,石油地质资源量约为2.7亿~4.1亿m~3,资源潜力可与苏北盆地高邮凹陷媲美,下一步应选择汇油面积大、圈闭条件好的构造实施钻探。
【英文摘要】
No commercial hydrocarbon is discovered till now in Nanwu sag of the southern depression in the South Yellow Sea basin,and the hydrocarbon resources potential evaluation is poorer by previous research. However,about200 million tons oil reserves in place were discovered by the end of 2011 in Gaoyou sag of Subei basin,which is nearby the South Yellow Sea basin and both have the similar geological features. To further evaluate the resource potential in Nanwu sag more clearly,the generation kinetics model widel...
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