石油与天然气地质 ›› 2001, Vol. 22 ›› Issue (1): 9-12.doi: 10.11743/ogg20010102

• 前沿探索 • 上一篇    下一篇

任丘大油田形成与变换带演化

王定一, 梁苏娟   

  1. 西北大学地质系, 陕西西安710069
  • 收稿日期:2000-11-30 出版日期:2001-03-25 发布日期:2012-01-16

EVOLUTION OF TRANSFORMATION BELT AND FORMATION OF BIG OILFIELD IN RENQIU

Wang Dingyi, Liang Sujuan   

  1. Geology Department, Northwest University, Xi'an, Shaannxi
  • Received:2000-11-30 Online:2001-03-25 Published:2012-01-16

摘要:

任丘古潜山油田是中国乃至世界上高产大油田之一.古潜山圈闭南北长30km,东西宽7km,面积183km2,其储层为下古生界和中上元古界碳酸盐岩,烃源岩为沙河街组二、三段泥质岩,盖层为沙河街组一段和东营组泥岩和膏盐层.主力油藏主要分布在潜山北部中元古界碳酸盐岩中,其形成是沙河街组四段至孔店组沉积期NWW向同口变换带与NNE向任丘凸起共同作用的结果.沙河街组二、三段沉积时期,变换带向北移至莫1-莫2井一带,任丘凸起沉入水下变为潜山,在其东、西两侧分别形成了属于坝县凹陷的陵城洼槽和属于饶阳凹陷的任西洼槽,为任丘油田形成丰富的油源和混合型原油准备了条件.沙河街组一段—东营组沉积时期,变换带向北移至高家堡一带,两个凹陷演化进入衰退期,形成了覆盖该地区的泥岩盖层.东营期末—晚第三纪,烃源岩成熟形成古潜山圈闭大油田.

关键词: 任丘, 大油田, 变换带, 冀中坳陷

Abstract:

Renqiu buried hill oilfield is one of the big oil fields with high productivity in China even in the world.The buried hill trap is 30 km2 in north-south,7 km2 in east west with an area of 183 km2.The reservoirs are carbonate rocks of Lower Palaeozoic,Middle and Upper Proterozoic,the source rocks are pelite of Es3+2 ,the caprocks are mudstone and halite of Es 1+Ed.The major oil pools,resulted from NWW striking Tongkou transformation belt and NNE striking Renqiu uplift,are in Middle Proterozoic carbonate rocks in the northern part of the buried-hill.In Es3+2 depositional period,the transformation belt displaced northward to Mo-14 ~Mo-2 Wells neighborhood.Then Renqiu uplift subsided under the water and became the buried hill.Lingcheng subsag in Baxian sag and Renxi subsag in Raoyang sag which are situated in two sides of the buried-hill provided rich hydrocarbon source and mingling crude oil for Renqiu Oilfield.In Es1~Ed period,the transformation belt moved north to Gaojiapu area,resulted in the recession of the two subsags,and formed regional mudstone caprock.In Ed~N period,source rocks matured and formed Renqiu oilfield of buried-hill trap type.

Key words: Renqiu, big Oilfield, transformation belt, Jizhong Depression

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