摘要
在对盆地基本地质特征认识的基础上,以地表油气显示及钻井显示情况为依据,对伦坡拉盆地古近系的油矿成矿条件进行了分析研究。盆地牛堡组二、三段及丁青湖组一段等主要生油岩层具有良好的生油条件及较大的厚度,为古近系地表油砂成矿提供了物质基础;牛堡组与丁青湖组发育好的砂岩储层,为石油聚集提供了储集条件。渐新世末的构造运动形成压性裂隙并直接破坏早期油藏的盖层,是地表油砂矿藏形成的关键因素。采用含油率法和含油饱和度法对盆地中央坳陷带和南北隆起带接合处的大断裂带附近5个构造的油砂资源量进行了计算,最终地质资源量为4 338.49×104t。该盆地油砂资源具有一定潜力,中央坳陷带和南北隆起带接合处的大断裂带附近是勘探的有利地带。
The Lunpola Basin lies in the interior of the North Tibet Plateau,and the regional tectonic location lies in the middle-north of the Gangdisi-Nianqingtanggula fold belt.On the basis of geological features of the basin according to the evidence from the surface oil or gas and the drillings,through the analysis of the mineral-formation conditions of oil sand in the Tertiary formation of the Lunpola Basin,the analysis displays that the main oil source rocks have good unboiled oil conditions and thickness,providing materials for the surface oil sand of the Palaeogene formation.The good sand reservoir in Niubao and Dingqinghu formations provide predominance oil accumulation conditions.The late Oligocene tectonic movement formed fractures and destroyed the caprock of the early reservoir,the key point of surface oil-sand-forming.The quantity of oil sand resource of five structures near the fault zone between the middle depression belt and the north and south uplift zone of the basin is calculated with the methods of oil-bearing rate and oil saturation.The geological resource is 4 338.49×10^4 t.The oil sand in Lunpola Basin is found to have specified potence through evaluation.The fault zone between the middle depression belt and the north and south uplift zone of the basin is the optimum area of exploration.
出处
《桂林工学院学报》
CAS
北大核心
2008年第2期167-173,共7页
Journal of Guilin University of Technology
基金
国家重大专项资助项目(ZP-S-03)
关键词
油砂资源
成矿条件
资源量
伦坡拉盆地
oil sand resource
mineral-formation conditions
resource quantity
Lunpola Basin
