郯庐断裂锦州段S型弯曲特征与油气聚集

发布时间：2018-04-20 19:25

本文选题：右旋走滑断层 + S型弯曲　；参考：《特种油气藏》2017年04期

【摘要】：在三维地震资料精细解释基础上,通过剖面特征与平面特征分析,结合构造圈闭、储层、油气运移和断层侧封等研究,初步探讨了郯庐断裂带锦州段S型弯曲对沙河街组油气聚集的影响。研究表明:郯庐断裂在辽东湾锦州地区表现为NE向延伸的辽西1号、辽西2号和辽西3号断层,剖面上呈负花状,平面上以大小不一的S型弯曲沿NE向延伸,整体为右旋走滑断层。S型弯曲可以划分为上升盘左凸型、上升盘右凸型、下降盘左凸型和下降盘右凸型4种类型。多个大中型油气田证明锦州地区油气聚集具有明显差异。下降盘右凸型、上升盘左凸型S型弯曲位于右旋走滑断裂压扭区,构造圈闭数量多、面积大,断层侧封性较好,易形成油气富集区。特别是下降盘右凸型S型弯曲,储层厚度大,油源断裂更发育,往往形成高丰度油气富集断块。下降盘左凸型、上升盘右凸型S型弯曲位于右旋走滑断裂张扭区,构造圈闭少,面积小,断层侧封性差,油气难以大规模聚集。该研究对研究区及类似走滑断裂发育地区的油气勘探有一定的指导意义。
[Abstract]:On the basis of fine interpretation of 3D seismic data, through the analysis of profile and plane characteristics, combined with structural traps, reservoirs, oil and gas migration and fault lateral sealing, etc. The effect of S-type bending on oil and gas accumulation of Shahejie formation in Jinzhou section of the Tanlu fault zone is preliminarily discussed. The results show that the Tanlu fault in Jinzhou area of Liaodong Bay is characterized by NE extending faults of No. 1, No. 2 and No. 3 of Liaoxi, with negative flower shape on the section and extending along NE direction with S-shaped bending of different sizes on the plane. The whole is the right-lateral strike-slip fault .S-type bending can be divided into four types: left convex type of ascending disk, right convex type of ascending disk, left convex type of descending disk and right convex type of descending disc. Many large and medium oil and gas fields prove that there are obvious differences in oil and gas accumulation in Jinzhou area. The right convex type of descending disk and the left convex type of ascending disk are located in the compression and torsional zone of right-lateral strike-slip fault. The structural traps are large in number and area, and the fault side seal is good, which is easy to form oil-gas accumulation area. Especially the right convex type S-type bending of the descending plate, the reservoir thickness is large, the oil-source fault is more developed, and the high abundance oil-gas enriched fault block is often formed. The left convex type of the descending disk and the right convex type of the ascending disk are located in the tensional and torsional zone of the right-lateral strike-slip fault, the structural traps are few, the area is small, the side seal of the fault is poor, and it is difficult for oil and gas to accumulate on a large scale. This study has certain guiding significance for oil and gas exploration in the study area and similar areas where strike-slip faults are developed.
【作者单位】：中海石油(中国)有限公司天津分公司;
【基金】：国家科技重大专项“近海大中型油气田形成条件与分布”(2011ZX05023-006)
【分类号】：P618.13

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