中国石油勘探 ›› 2009, Vol. 14 ›› Issue (2): 23-30,6.

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轮南天窗型古潜山油气藏

刘静江,毛光周,阮洋,王庆东   

  1. 西北大学地质学系;中国石油塔里木油田分公司
  • 出版日期:2009-04-15 发布日期:2009-04-15

Lunnan Top-Opening Buried Hill Reservoir

Liu Jingjiang,Mao Guangzhou,RuanYang and Wang Qingdong   

  1. Liu Jingjiang1,2,Mao Guangzhou1,RuanYang2,Wang Qingdong2//1.Geology Department of Northwest University,Xi’an City,Shaanxi Province 710069;2.PetroChina Tarim Oilfield Company,Korla City,Xinjiang Uygur Autonomous Region 841000
  • Online:2009-04-15 Published:2009-04-15

摘要: 轮南古潜山油气藏是塔里木盆地发现的一个超大型碳酸盐岩古潜山油气藏,潜山相对高度为1000~1500m,面积为10000km2,埋深为4100m,潜山主要储集体为奥陶系碳酸盐岩风化壳岩溶裂缝—溶洞系统;潜山周围斜坡由巨厚的上奥陶统泥岩、石炭系泥岩构成披覆盖层,但在潜山顶部有一个80km2的区域为巨厚的三叠系含水砂岩所覆盖,形成古潜山的天窗区。由于天窗的存在从而形成了一种特殊类型的油气藏——天窗型古潜山油气藏。天窗型古潜山油气藏的油气主要分布在潜山斜坡部位,而潜山的高部位为水区或含油水区;天窗型古潜山油气藏油水界面是倾斜的,油气藏具有水动力特征。

关键词: 塔里木盆地, 轮南古潜山, 天窗型古潜山油气藏, 天窗, 水动力圈闭, 动态聚集

Abstract: Lunnan buried hill reservoir is a super large carbonate reservoir, with the relative height 1000~1500m, the acreage 10000km2, and the buried depth 4100m. The main reservoir is the Ordovician carbonate karst weathering crust cracks-cave system. Above the hill, there is a giant thick Ordovician or Carboniferous mudstone onlapped on the slopes as a capping formation, but an area of more than 80km2 in the top is covered by thick Triassic waterbearing sandstone, so a top-window area comes into being. It is just because of the top window that a special type of reservoir is formed, i.e. the topopening buried hill reservoir. In this type of reservoir, oil and gas are mostly accumulated in the slopes surrounding the hill. The upper area near the top is water area or oil/water bearing area. The oil-water interface in the reservoir is tilting, and the oil-gas accumulation has unique hydrodynamic features.

Key words: Tarim Basin, Lunnan buried hill, top-opening buried hill reservoir, top window, hydrodynamic trap, dynamic accumulation

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