渤海油田新近系地层速度异常研究  

Analysis of Neogene stratum velocity anomaly in Bohai oilfield

作　　者：左中航 姜利群 张海义 陈文雄 蔡纪琰 ZUO Zhong-hang;JIANG Li-qun;ZHANG Hai-yi;CHEN Wen-xiong;CAI Ji-yan(Bohai Oilfield Research Institute,Tianjin Branch of CNOOC Limited,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司渤海石油研究院

出　　处：《地球物理学进展》2019年第5期2128-2132,共5页Progress in Geophysics

基　　金：国家科技重大专项“渤海辽东湾地区潜在富烃凹陷成藏研究与有利勘探方向预测”(2016ZX05024-002-006)资助

摘　　要：渤海油田新近系勘探中,钻井揭示了某些区域存在着速度异常,主要表现为时间图上构造高部位钻井揭示为水层,而低部位是油层,给勘探人员的分析带来了困惑,速度异常导致了时间图和构造图圈闭形态的不一致性.因此,判断速度异常的分布以及速度异常产生的原因分析成为这些区域急需解决的首要任务.本文通过叠加速度场去压实的方法很好解决了这一问题,并对速度异常产生的原因进行分析,得出新近系速度异常与走滑断层有着直接关系的结论.这一结论在后期的钻探中得到了证实,为新近系的钻井设计、工程设计提供了很好的指导和帮助.In the Neogene stratum exploration of the Bohai oilfield, drilling revealed velocity anomalies in some areas. The main manifestations are that the high part of the structure on the time map reveals the water layer, while the lower part is the oil layer, which causes confusion to the exploration anlalysis. Velocity anomalies led to inconsistencies in the trap shape of the time and structure maps. Therefore, the analysis of the distribution of speed anomalies and the analysis of causes of speed anomalies have become the most important tasks to be solved in these areas. This paper solves this problem by superimposing the velocity field and decompaction it, and analyzes the causes of the velocity anomaly, and concludes that the anomaly of the Neogene stratum is directly related to the strike-slip fault. This conclusion was confirmed in the drilling of the later stage, and provided a good guidance and assistance for the drilling design and engineering design of the Neogene.

关 键 词：速度异常 包络去压实 变速成图 走滑断层 

分 类 号：P631[天文地球—地质矿产勘探] P738[天文地球—地质学]