应用地球化学方法评价断层封闭性——以苏北盆地金湖凹陷坝田地区为例

发布时间：2018-03-15 03:21

本文选题：苏北盆地　切入点：金湖凹陷　出处：《新疆石油地质》2017年02期 　论文类型：期刊论文

【摘要】：基于苏北盆地金湖凹陷坝田地区和周缘次凹以及断层上、下盘原油地球化学特征对比分析,明确主力生烃次凹,判识断层封闭性,分析坝田地区勘探潜力。研究表明,龙岗次凹周缘原油成熟度最高,为烃源岩成熟阶段产物,是坝田地区周缘主力生烃次凹。F_1断层上、下盘原油正构烷烃、甾烷、萜烷分布以及成熟度等地球化学特征存在明显差异,揭示F_1断层处于封闭状态,证实龙岗次凹烃源岩所生成的成熟油未越过F_1断层运移至坝田地区。坝田地区含油砂岩抽提物成熟度低,与自身斜坡区烃源岩和汊涧次凹、东阳次凹所生成的低成熟阶段产物相似。低成熟阶段烃源岩生烃量有限,难以形成规模油藏。因此,坝田地区勘探潜力较差,而紧邻龙岗次凹的断块圈闭是有利勘探目标。
[Abstract]:Based on the comparative analysis of geochemical characteristics of crude oil in the downstream of the dam area, the peripheral subconcave and the faults in Jinhu depression, North Jiangsu Basin, the main hydrocarbon generation subconcave is determined, the fault sealing is identified, and the exploration potential in the dam area is analyzed. The ripeness of Longgang subdepression crude oil is the highest, which is the product of source rock maturation stage. It is the main hydrocarbon generation subsag. FJ 1 fault in the peripheral margin of Batian area, and the crude oil has normal alkane, sterane, There are obvious differences in geochemical characteristics such as the distribution and maturity of terpene, which indicates that the fault F1 is in a closed state. It is proved that the mature oil generated by the source rocks of Longgang subsag has not migrated to the Batian area over the FSC1 fault. The oil-bearing sandstone extracts in the Batian area have low maturity and are similar to those of the source rocks and branchian subconcave in their own slope area. The low mature stage products generated from Dongyang subdepression are similar. The source rocks in low maturity stage are limited in hydrocarbon generation and difficult to form large-scale reservoirs. Therefore, the exploration potential in the dam field area is poor, and the fault block trap adjacent to Longgang sub-depression is a favorable exploration target.
【作者单位】：西南石油大学地球科学与技术学院;西南石油大学天然气地质四川省重点实验室;中国石化江苏油田分公司安徽采油厂;
【基金】：国家973项目(2014CB239005) 国家自然科学基金(41502146)
【分类号】：P618.13

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