金湖凹陷铜城断裂带断层活动与油气富集关系

发布时间：2018-11-13 08:09

【摘要】：依据三维地震资料,综合钻探成果,运用断层落差法研究断层在古近系沉积期间的活动特征,探讨断层活动特点对油气富集条件的影响。研究结果表明:断层活动受构造背景控制,在伸展阶段呈"弱—弱—强"变化,具"分时、分段、分区"特点,并分化出长期活动断层、晚期活动断层和早期活动断层。断层活动从运移、圈闭、保存3个方面影响油气富集,长期活动断层控制地层变形能力强,优势运移指向收敛,有利油气聚集,形成断鼻或断块圈闭规模较大;晚期活动断层和早期活动断层控制地层变形能力弱,优势运移指向分散,形成断块圈闭数量和规模不及前者。成藏期,控圈断层活动越弱,保存条件越好,越易见油气。铜城断层东侧油气富集条件相对有利。该研究结果可对今后该类型油气藏的勘探部署提供一定的参考。
[Abstract]:Based on three dimensional seismic data and comprehensive drilling results, fault drop method is used to study the characteristics of fault activity during Paleogene sedimentary period, and the influence of fault activity characteristics on oil and gas enrichment conditions is discussed. The results show that the fault activity is controlled by the tectonic background, with the characteristics of "timesharing, segmenting and partitioning" in extensional stage, and differentiating into long active faults, late active faults and early active faults. Fault activity affects oil and gas enrichment from three aspects: migration, trap and preservation. Long-term active faults control strong deformation ability of formation, dominant migration direction converges, favorable oil and gas accumulation, forming fault nose or fault block trap scale. The late active faults and the early active faults control the weak deformation ability of the strata, and the dominant migration direction is scattered, resulting in the number and scale of fault block traps being less than the former. In the reservoir forming period, the weaker the fault activity is, the better the preservation conditions are, and the easier oil and gas are found. The oil and gas enrichment conditions on the east side of Tongcheng fault are relatively favorable. The results can provide some reference for the future exploration and deployment of this type of reservoirs.
【作者单位】：中国石油新疆油田分公司;中国石油大学(华东);中国石化江苏油田分公司;
【基金】：国家科技重大专项“精细油层描述技术及剩余油赋存方式研究”(2011ZX05011-001) 中国石油化工股份有限公司江苏油田分公司科技项目“金湖凹陷坝田-铜城地区构造样式及成藏分析”(31450008-13-ZC0607-0010)
【分类号】：P618.13

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