岩性油气藏 ›› 2026, Vol. 38 ›› Issue (2): 145–152.doi: 10.12108/yxyqc.20260213

• 地质勘探 • 上一篇    下一篇

渤海湾盆地盆缘庙西南地区构造特征及控藏作用

赵野1(), 许鹏1, 胡贺伟1, 王航1, 杨娇娇2   

  1. 1 中海石油（中国）有限公司天津分公司 渤海石油研究院， 天津 300459
    2 中海油能源发展股份有限公司 工程技术公司， 天津 300459
  • 收稿日期:2025-07-15 修回日期:2025-08-21 出版日期:2026-03-01 发布日期:2025-12-16
  • 第一作者:赵野（1986—），男，硕士，高级工程师，主要从事石油地质综合研究方面的工作。地址：（300459）天津市滨海新区海川路2121号渤海油田大厦B座。Email:zhaoye4@cnooc.com.cn。
  • 基金资助:
    中国海洋石油有限公司“十四五”重大科技项目“地层岩性油气藏高效识别与精细评价技术”(KJGG2022-0303)

Tectonic characteristics of Miaoxinan area at the margin of Bohai Bay Basin and their controls on hydrocarbon accumulation

ZHAO Ye1(), XU Peng1, HU Hewei1, WANG Hang1, YANG Jiaojiao2   

  1. 1 Bohai Oilfield Research Institute, Tianjin Branch of CNOOC Ltd., Tianjin 300452, China
    2 Engineering Technology Company, CNOOC Energy Development Co., Ltd., Tianjin 300452, China
  • Received:2025-07-15 Revised:2025-08-21 Online:2026-03-01 Published:2025-12-16

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摘要：

综合应用三维地震资料、钻测井资料及地球化学测试资料对渤海湾盆地庙西南地区洼陷结构、构造演化特征、烃源岩分布及控藏作用进行了研究。研究结果表明：①庙西南地区为郯庐走滑断裂改造型洼陷，始新世中晚期，在近东西向挤压应力场作用下，洼陷结构由NWW向转变为NEE向，沙河街组四段由东向西遭受剥蚀强度逐渐减弱，东侧庙西南洼沙四段烃源岩剥蚀殆尽，西侧黄河口东洼沙四段高硫咸化优质烃源岩得以保留。②黄河口东洼发育深切至沙三段—沙四段烃源岩的长期活动断裂，油气沿通源断层向上运聚，具有深、浅层复式成藏特征。③庙西南洼陷仅发育低熟的沙三段烃源岩，且通源断层晚期活动性差，油气难以突破东营组厚层泥岩盖层，仅在深层沙一段和沙二段发现天然气藏。始新世中晚期，中国东部近东西向挤压活动对盆缘洼陷结构、烃源岩展布、油气成藏均具有重要控制作用。

关键词: 郯庐走滑断裂, 洼陷结构, 差异剥蚀, 通源断层, 烃源岩, 沙河街组, 始新世, 庙西南地区, 渤海湾盆地

Abstract:

Using three-dimensional seismic data, drilling and logging data, and geochemical testing data，the depression structure, structural evolution characteristics, source rock distribution, and controlling effects of hydrocarbon accumulation in Miaoxinan area of Bohai Bay Basin were studied. The results show that: （1） Miaoxinan area is a transformed depression formed by the Tan-Lu strike-slip fault. During Middle-Late Eocene, the near east-west regional compression movement led to the transformation of the depression structure from NWW to NEE, the fourth section of Shahejie Formation (E2s4) was gradually weakened in erosion intensity from east to west, and source rocks of E2s4 in south sag of Miaoxi Sag on the east side were completely eroded. The high-sulfur and salty high-quality source rocks of E2s4 in the east sag of Huanghekou Sag on the west side have been preserved. （2） The east sag of Huanghekou Sag has developed long-term active faults that extend deep into source rocks of E2s3 and E2s4, oil and gas migrate and accumulate upward along the source-connecting faults, demonstrating the characteristics of deep and shallow compound hydrocarbon accumulation. （3） The south sag of Miaoxi Sag has only developed low-maturity hydrocarbon source rocks in E2s3, and the late stage activity of source-connecting faults is poor, oil and gas are difficult to break through the thick mudstone cap of Dongying Formation, and natural gas reserves have only been discovered in deep E2s1 and E2s2. In Middle-Late Eocene, the near east and west compression activities of eastern China played an important controlling role in the structure of basin margin depression, the distribution of source rocks and the accumulation of oil and gas.

Key words: Tan-Lu strike-slip fault, depression structure, differential erosion, source-connecting fault, source rocks, Shahejie Formation, Eocene, Miaoxinan area, Bohai Bay Basin

中图分类号: 

  • TE122.1

图1

渤海湾盆地庙西南地区位置（a）、新生界底面地貌形态（b）及古近系岩性地层综合柱状图（c）"

图2

渤海湾盆地庙西南地区东西向洼陷结构剖面（剖面位置见图1a）"

图3

渤海湾盆地庙西南地区东西向洼陷构造演化剖面"

图4

渤海湾盆地黄河口东洼近南北向结构剖面（剖面位置见图1a）"

图5

渤海湾盆地庙西南地区东西向油藏对比剖面（剖面位置见图1a）"

图6

渤海湾盆地黄河口东洼与庙西南洼油源对比"

图7

渤海湾盆地庙西南地区近东西向地震剖面（a）及T6层拉平地震剖面（b）（剖面位置见图1a）"

图8

渤海湾盆地庙西南地区LK31-A井沙四段岩性组合特征"

图9

渤海湾盆地庙西南地区油气成藏模式"

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