楚雄盆地云龙凹陷石油地质条件及勘探前景

THE OIL GEOLOGICAL CONDITION AND EXPLORATION POTENTIAL OF YUNLONG SAG, CHUXIONG BASIN

云龙凹陷位于楚雄盆地东北部浅坳区一级构造单元内， 由于其特定的沉积构造环境与楚雄盆地主体有所不同， 长期未予重视。“八五”以后， 随着大量勘探工作的投入， 特别是“前陆盆地”概念的引入， 认为它应该是楚雄前陆盆地的一部分而统一起来研究， 取得了可喜的成果。笔者以云龙凹陷区域地质为背景， 以地震资料解释为基础， 从构造、地层、圈闭条件等方面进行了论述。表明云龙凹陷的生储盖条件较好， 所发现的三个局部构造具备圈闭条件， 且与生排烃高峰期匹配好， 可作为近期油气勘探的首选目标。云龙凹陷的勘探前景已经引起了勘探决策层的高度重视。由于其勘探目的层浅、成本较低、风险不大， 获得突破的可能性较高。如果针对发现的局部构造进一步做二维地震面积详查， 控制构造形态及圈闭条件， 一旦圈闭落实，

The Yunlong sag is situated in the structure unit I of the NE part of Chuxiong basin. And no attention was paid to it for a long time because its deposit and structure environment is different result has been obtained following a large amount of exploration works since the 8th five year plan, especially owing to the introduction of “foreland basin” concept and regarding it as a part of Chuxiong foreland basin in a unified study. In this paper, the structure, stratigraphy and closed in coditions of Yunlong sag are interpreted basing upon the regional geological setting and seismic data, which shows the good formation, reserve and covering conditions of Yunlong sag. And the 3 discovered partial structures have closed in conditions and good coordination with the high hydrocarbon forming and relesing periods, which can be considered to be the first target in recent oil gas exploration. Because the target horizon is not very deep, the breakthrow possibility is high. And the drilling exploration can be carried out if the closed in condition is confirmed by two-dimensional seismic areal investigation in detail of the discovered partial structures.