楚雄前陆盆地的油气特征

doi:10.11743/ogg20000405

摘要/Abstract

摘要：

楚雄盆地为一中生代前陆盆地,盆地在演化过程中形成了“两凹一隆”的古地理格局。前渊盆地快速沉降过程中发育欠补偿生油凹陷,在前陆隆起阻挡作用下隆后盆地形成半局限环境生油凹陷。盆地中储集岩可分为三大类:第一为前渊地带和隆后盆地中的浊积岩;第二为前陆隆起两侧和隆后盆地边缘的河流、三角洲和滨浅海陆源碎屑岩;第三为前陆隆起向海一侧的前陆缓坡碳酸盐岩。前陆逆冲作用从拉丁期开始,以前置式的方式向扬子克拉通推覆,形成了断弯褶皱圈闭、断展褶皱圈闭、台阶状逆冲断层及岩性圈闭、基底折离圈闭、推覆带前缘传播消减带褶皱圈闭等多种圈闭类型。前陆逆冲带的侵位促进了油气的运移和保存,是油气成熟和运移的热源和动力,因而盆地逆冲带的演化对油气的聚集起到了巨大的促进作用,因而楚雄盆地是一个油气勘探前景广阔的区域。

关键词: 油气特征, 前陆盆地, 盆地演化

Abstract:

Chuxiong Basin is a Mesozoic basin located in central Yunnan.The basin developed into two sag one uplift palaeogeographic pattern.A uncompensated oil generation sag formed when foredeep basin rapidly subsided,and back-bulge basin developed into a semi-restricted oil generation sag under the blockage of foreland uplift.The reservoir rocks in the basin could be divided into three types:1.turbidite in the foredeep belt and the back-bulge basin;2.continental clastic rocks of fluvial,deltaic,littoral shallow sea facies on two sides of the foreland uplift and the margin of the bulge basin;3.carbonate ramp on the foreland uplift facing the sea.Foreland thrusting towards Yangtze craton started in Latinian stage,thus resulting in fault-bended fold trap,fault-propagated fold trap,step thrust-lithologic trap,basal detachment trap,the subducted belt fold trap in nappe front.The emplacement of foreland thrust belt improved hydrocarbon migration and preservation,it acted as the heat source and dynamic force of hydrocarbon maturation and migration.Hydrocarbon exploration in Chuxiong Basin will show broad prospects.

Key words: hydrocarbon feature, foreland basin, basin evolution

中图分类号:

TE121.1

尹福光,许效松,万方,等. 楚雄前陆盆地的油气特征[J]. 石油与天然气地质, 2000, 21(4): 308-312. doi: 10.11743/ogg20000405 Yin Fuguang,Xu Xiaosong,Wan Fang,et al. HYDROCARBON FEATURES OF FORELAND BASIN IN CHUXIONG[J]. Oil & Gas Geology, 2000, 21(4): 308-312. doi: 10.11743/ogg20000405

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