新疆石油地质 ›› 1991, Vol. 12 ›› Issue (1): 13-22.

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东海盆地西南部地质特征与油气分布探讨

王国纯   

  1. 中国海洋石油总公司海洋石油勘探开发研究中心
  • 发布日期:2020-05-26

GEOLOGICAL CHARCTERITSICS AND DISTRIBUTION OF OIL AND GAS IN SOUTHWEST OF EAST CHIMA SEA BASIN

Wang Guochun   

  1. Research Center of Offshore Oil Exploration and Development China National Offshore Oilnn Corporation
  • Published:2020-05-26

摘要: 本文根据近3X104km地震和13口探井及其它地球物理、地质等方面资料,综合分析认为:东海盆地西南部与盆地其它布分在发育演化、构造运动、沉积环境等方面差异甚大。
盆地西南部(杭州湾一冲绳岛断裂以南地区)发育演化径历了断陷一坳陷一隆起一铺盖四个阶段。始新世末期的隆起在研究区演化史上有15~20Ma 的沉积间断、剥蚀。这段历程,盆地其它部分未曾经历。其次是区内始新世末期抬升运动,致使始新统及以下老地层受剥蚀,仅始新统最大剥蚀量达1000m,这是盆地内绝无仅有的。第三是第三纪以海相沉积环境为主,特别在始新世,为海侵高潮,海城宽阔达8000km2,这时盆地东北部正接受陆相沉积。研究区中部(北东向)可能存在超压泥岩及多套生油岩系,应为有利生油气区。研究区可能是盆地最有油气远景地 区之一。

关键词: 东海盆地, 构造运动, 油气富集

Abstract: Southwestern of East China Sea Busin differ from other part of bausin in evolution,tectonic movement、 sedi-mental environment etc.
Southwestern evolution of East China Sea Basin may be divided into four stages,i • e • faultdown,downwarp,lift and draping.Sediment interupted 15-20M.Y. during lift movement later Eocene. This proccess did not undergo in other part of oasin. Second,it was eroded over 1000 meters during elevating move-ment later Eocene. This scene never took place in other area of basin, Third characteristic is mainly marine facies enviro-nment during Eogene yet transgressive develpment highest peak at Eocene, marine water area about 8000km2. Northeastern of the basin is continentai deposit. Mudston rock of high pressure may be distributed in the middle part of research area. The oil and gas potenliai of restarch area may be best in the basin.

Key words: Eost sea Basin, Tectonic movement, oil and gas enrichment