Strike-slip activities and their controls of structural traps in Daping-fang area, eastern sag of Liaohe Depression
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摘要:
辽河东部凹陷由于潜在的油气资源和复杂的构造条件（郯庐断裂穿过此凹陷），走滑活动及其对构造圈闭的控制作用对于揭示郯庐断裂北段新生代的活动及渤海湾盆地的油气勘探有重要意义。以大平房地区为实例，根据地震、钻井和测井资料，揭示了大平房地区存在走滑构造活动的行迹，包括平面上的雁列构造及其对火山岩分布的影响，剖面上的负花状构造样式及断层倾向和背斜轴向沿构造走向的变化。发育的荣兴屯走滑断裂控制并改造大平房断背斜的构造格局，东营组二段沉积开始，致使地层反转，形成透镜状地层。荣兴屯走滑活动产生的构造圈闭具有纵向分段、平面分带的特征。
Abstract:The eastern sag in Liaohe Depression bears potential oil and gas resources and is located in the Bohai Bay Basin with the Tanlu fault crossing through the Depression. In-depth investigation of strike-slip activities and their controls of structural traps will have a great significance for Cenozoic activity of northern Tanlu fault and hydrocarbon exploration in Bohai Bay Basin. In this study, Dapingfang area was taken as an example to recognize strike-slip faults and their characteristics of development on the basis of seismic data, drilling data and logging data. The study included en echelon structures in plane and their control of volcanic rock, negative flower structures in profile as well as the changes of fault dip and axial anticline along the structural strike. Rongxingtun strike-slip faults controlled and transformed Dapingfang anticline structural pattern, making strata reverse since the appearance of the second member of Dongying Formation (E3d2), as"lentoid". Rongxingtun strike-slip activities formed structural traps, which were character-ized by planar belt and vertical segmentation layout.
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Key words:
- rift basin /
- strike-slip activity /
- inversion structure /
- structural trap /
- faulted anticline /
- Dapingfang area
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表 1 大平房地区东二段火山岩最大沉积厚度及剥蚀量
Table 1. Maximum volcanic rock sedimentation thickness and denudation amount in E3d2 in Dapingfang area
剖面 A-A' B-B' C-C' D-D' 井位 厚度/m 剥蚀量/m 不整合面 井位 厚度 剥蚀量/m 不整合面 井位 厚度 剥蚀量/m 不整合面 井位 厚度 剥蚀量/m 不整合面 大15 28.5 645 东营组顶部 大32 166 749.28 E3d1 大36 63 2460.91 E3d1 大43 206.5 1349.5 E3d1 大45 80.5 大38 57 1495.1 E3d1 大4 81 1411.261 E3d2 大33 443 461.96 E3d2 大5 122.5 大3 113.5 大8 133.5 1318.41 E3d3 大42 52.5 629.22 E3d1 大7 113.5 大2 137 大29 361.5 2171.64 E3d3 大16 57.5 大46 115.5 1506.94 E3d2 大6 215 295.07 E3d3 大20 75 455.76 E3d2 大1 164.5 大40 362 116.29 Ng之上 大17 70 315.8 E3d3 大22 212 注：E3d1—东营组一段；E3d2—东营组二段；E3d3—东营组三段；Ng—馆陶组；A-A’、B-B’、C-C’、D-D’剖面见图 3 
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