西藏羌塘盆地烃源岩古油藏带及其油气勘探远景  

Fossil-reservoir of hydrocarbon rock in Qiangtang Basin of Tibet and exploration perspective of oil and gas

作　　者：伍新和[1] 王成善[2] 伊海生[1] 邹艳荣[3] 李亚林[2] 

机构地区：[1]成都理工大学沉积地质研究所,四川成都610059 [2]成都理工大学油气藏地质及开发工程国家重点实验室,四川成都610059 [3]中国科学院广州地球化学研究所,广东广州510640

出　　处：《石油学报》2005年第1期13-17,共5页Acta Petrolei Sinica

基　　金：国家重点基础研究发展规划( 973)项目(G1998040804)"羌塘盆地演化与油气远景"课题资助。

摘　　要：羌塘盆地是青藏高原北部的大型中生代海相沉积盆地,发育有厚度大、分布广的烃源岩。用有机地球化学方法,分析了羌塘盆地上三叠统的肖茶卡组、中侏罗统布曲组、夏里组和索瓦组烃源岩结果发现,其有机质类型好、丰度高,成熟度从成熟到过成熟均有分布,埋藏条件较好。生烃过程模拟结果表明,羌塘盆地烃源岩有两次生烃、排烃过程,且生烃量巨大。于2000 年发现的位于羌塘盆地羌南坳陷比隆错—昂达尔错地区布曲组白云岩中的古油藏带,东西长约100km,南北宽约20km,为一狭长湿状、具有强烈油气味的轻质油苗群。根据油—岩地球化学特征,分析并确定,古油藏带主要来源于下侏罗统烃源岩。古油藏带的发现进一步说明了羌塘盆地曾有大规模的油气运移和成藏,具有良好的油气勘探远景。Qiangtang Basin is a large Mesozoic marine sedimentary basin located on northern Qingzang plateau and has the widespread and thick source rocks. The source rocks of Xiaochaka Formation in the upper Triassic and Buqu Formation and Xiali Formation in the middle Jurassic were researched by organic geochemistry means. It is found that the organic matter type of source rocks is good, and abundance of organic matter is large. The maturity of organic matter varies from mature to over-mature, and the burial conditions of source rocks are relatively good. The simulation of hydrocarbon-generation process revealed that source rocks had two periods of hydrocarbon generation and hydrocarbon expulsion. The production of hydrocarbon is extremely large. The fossil-reservoir belt located in dolomite of Buqu Formation in the Bilongcuo-Angdaercuo region has a length of 100 kilometers and a width of 20 kilometers. It is a long and narrow humid swarm with light oil. The organic geochemistry characters of oil-source rocks show that oil and gas of the fossil-reservior come mainly from the hydrocarbon rock in the lower Jurassic. The discovery of the fossil-reservoir belt implied that Qiangtang Basin had large-scale migration and accumulation of oil and gas. It will have a good prospect for exploration of oil and gas.

关 键 词：西藏 羌塘盆地 中生代 烃源岩 古油藏带 地球化学特征 油气勘探远景 

分 类 号：TE112.36[石油与天然气工程—油气勘探]