北部湾盆地迈陈凹陷区域探井数模分析与油气勘探方向

发布时间：2018-06-10 15:52

本文选题：盆地数值模拟 + 热演化生烃史　；参考：《石油与天然气地质》2017年01期

【摘要】：在深入分析北部湾盆地迈陈凹陷西南部边缘Y1井油气地质资料的基础上,采用Petro Mod软件开展了该区油气地质及地球化学的数值模拟研究。研究结果表明,该区仅始新统流沙港组二段暗色泥岩达到较好烃源岩有机质丰度标准,但其成熟度较低,尚未达到成熟生烃门限。迈陈凹陷总体上地温场偏低,综合判识确定其成熟生烃门限为埋深2 600 m,比涠西南凹陷及乌石凹陷始新统烃源岩成熟生烃门限明显偏深。由于Y1井未处在生烃凹陷成熟烃源岩有效生烃灶供给范围内,故其不能获得充足的烃源供给,乃至在其局部构造及圈闭中富集成藏,而最终导致Y1井钻探圈闭为无油气聚集的空圈闭。因此,研究区今后应重视寻找古近系烃源岩有效供烃系统之内的有利区带及圈闭目标,以期获得商业性油气勘探的突破。
[Abstract]:Based on the deep analysis of oil and gas geological data of Y1 well on the southwest edge of Mai Chen depression in Beibu Bay Basin, a numerical simulation study of oil and gas geology and geochemistry in this area has been carried out by using Petro Mod software. The results show that only the dark mudstone of the second member of the Eocene Liushagang formation reaches the standard of organic matter abundance of the source rock, but its maturity is low and the threshold of mature hydrocarbon generation has not been reached. On the whole, the geothermal field of Meichen sag is relatively low, and the threshold of mature hydrocarbon generation is determined to be 2 600 m by comprehensive identification, which is obviously deeper than that of Eocene source rocks in Wei Southwest Sag and Wushi Sag. Because Y1 well is not in the range of effective hydrocarbon generating range of mature source rock in hydrocarbon generating sag, it can not obtain sufficient hydrocarbon source supply, even rich and integrated reservoir in its local structure and trap. Finally, the drilling trap of well Y1 is a void trap without oil and gas accumulation. Therefore, in the future, the study area should pay attention to the exploration of favorable zones and trap targets within the effective hydrocarbon supply system of Paleogene source rocks in order to obtain a breakthrough in commercial oil and gas exploration.
【作者单位】：广州海洋地质调查局;中国科学院广州地球化学研究所边缘海地质重点实验室;南华大学;中国石油南方石油勘探有限责任公司;
【基金】：国家自然科学基金项目(41176052) 中国科学院战略性先导科技专项(XDA03030301)
【分类号】：P618.13

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