岩性油气藏 ›› 2022, Vol. 34 ›› Issue (3): 1–14.doi: 10.12108/yxyqc.20220301

• 地质勘探 • 上一篇    下一篇

渤海海域新生界大型岩性油气藏形成条件及勘探方向

牛成民, 杜晓峰, 王启明, 张参, 丁熠然   

  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
  • 收稿日期:2021-10-30 修回日期:2022-02-04 出版日期:2022-05-01 发布日期:2022-05-12
  • 第一作者:牛成民(1966-),男,教授级高级工程师,主要从事勘探地质综合研究与管理工作。地址:(300459)天津市滨海新区海川路2121号渤海石油管理局B座。Email:Niuchm@cnooc.com.cn。
  • 基金资助:
    中海石油科技重大专项“渤海油田上产4000万吨新领域勘探关键技术”（编号：CNOOC-KJ135ZDXM36TJ08TJ）资助

Formation conditions and exploration direction of large-scale lithologic reservoirs of Cenozoic in Bohai Sea

NIU Chengmin, DU Xiaofeng, WANG Qiming, ZHANG Can, DING Yiran   

  1. Bohai Oilfield Research Institute, Tianjin Branch of CNOOC Ltd., Tianjin 300459, China
  • Received:2021-10-30 Revised:2022-02-04 Online:2022-05-01 Published:2022-05-12

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摘要： 通过对渤海海域新生界盆地的构造特征、层序格架下的沉积充填演化和主力烃源岩特征的研究，剖析了该区域规模型岩性油气藏的形成条件和有利发育区，并明确了下一步的重点勘探领域及攻关方向。研究结果表明：①渤海海域大型油气藏的重点勘探层系为古近系沙河街组、东营组和新近系明化镇组下段（明下段）。明下段处于湖盆萎缩期，形成了河道、极浅水三角洲和河湖交互体系等3类大型岩性油气藏；东营组形成于坳陷期，受盆外水系供给影响形成滑塌浊积扇和坡移扇2类大型湖底扇岩性油气藏；沙河街组形成于断陷期，受盆内局部物源影响，形成了近源扇三角洲侧向尖灭型、走向斜坡地层超覆型、上倾尖灭型等3类大型岩性油气藏。其中明下段河湖交互体系与沙河街组近源扇体是最有利的领域。②黄河口凹陷西段以及部分环渤中凹陷斜坡区的明下段勘探潜力极大，是渤海储量增长最现实的勘探领域；石臼坨凸起西段陡坡带、渤南低凸起陡坡带以及埕北低凸起陡坡带等区域的沙河街组近源扇体为下步勘探的重点突破方向；环渤中凹陷以及辽中凹陷中部和北部东营组湖底扇勘探前景良好；莱州湾凹陷北部等沙三段大型前积三角洲和环渤中凹陷沙一二段滩坝为后续潜在的有利勘探领域。

关键词: 近源扇体, 浅水三角洲, 河湖交互体系, 大型岩性油气藏, 沙河街组, 东营组, 明化镇组下段, 渤海海域

Abstract: Based on the systematic analysis of structural evolution， sedimentary filling evolution characteristics under sequence framework and the characteristics of the main source rocks in Cenozoic basin in Bohai Sea， the formation conditions and development characteristics of large-scale lithologic reservoirs in Bohai Sea were analyzed， and the favorable exploration fields and next research directions were clarified. The results show that： （1）Paleogene Shahejie Formation，Dongying Formation and the lower member of Neogene Minghuazhen Formation are the key strata for forming large lithologic reservoirs in Bohai Sea. The lower member of Minghuazhen Formation was in the lacustrine shrinking period，forming three types of large-scale lithologic reservoirs，such as river channel， very shallow delta and river-lake interaction system. Dongying Formation was in the depression period，and two types of large-scale sublacustrine fan lithologic reservoirs，slump turbidite fans and slope-sliding fans，were formed due to the supply of water system outside the basin. Shahejie Formation was in the fault depression period， affected by local provenance in the basin，it formed three types of large-scale lithologic reservoirs，including near-source fan delta lateral pinch out type，strike slope stratigraphic overlap type and updip pinch-out type. Among them，the river-lake interaction system of the lower member of Minghuazhen Formation and the nearsource fan bodies of Shahejie Formation are the most favorable areas.（2）The lower member of Minghuazhen Formation in western Huanghekou Sag and slope area surrounding Bozhong Sag has great exploration potential， which is the most realistic exploration field for increasing reserves in Bohai Sea. The near-source fan bodies of Shahejie Formation in the steep slope zones of western Shijiutuo uplift，Bonan low uplift and Chengbei low uplift are the key breakthrough directions for next exploration. The sublacustrine fans of Dongying Formation have good exploration prospect in the surrounding areas of Bozhong Sag，and the central and northern Liaozhong Sag. The large-scale progradational delta of the third member of Shahejie Formation in northern Laizhouwan Sag and the beach bar of the first and second members of Shahejie Formation in the surrounding areas of Bozhong Sag are potential favorable exploration fields.

Key words: near-source fans, shallow water delta, river-lake interaction system, large-scale lithologic reservoirs, Shahejie Formation, Dongying Formation, the lower member of Minghuazhen Formation, Bohai Sea

中图分类号: 

  • TE122.1
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