西藏伦坡拉盆地烃源岩特征及资源条件

CHARACTERISTICS OF SOURCE ROCKS AND RESOURCE PROSPECT IN THE LUNPOLA BASIN, TIBET

顾忆 邵志兵 叶德燎 张小英 卢亚平

GU Yi SHAO Zhi-bing YE De-liao ZHANG Xiao-ying LU Ya-ping

中国新星石油公司实验地质研究院, 江苏无锡214151 2. 中国新星石油公司中南石油局研究院, 湖南长沙410117

Research Institute of Experimental Geology, CNSPC, Wuxi 214151, China 2. South central Bureau of Petroleum Geology, CNSPC, Changsha 410117, China

伦坡拉盆地主要发育下第三系牛堡组烃源层系,主力烃源岩为牛二段及牛三下亚段,牛三上亚段也有一定的生烃能力。烃源岩受沉积相带的控制,主要发育于深-半深湖相区,蒋日阿错凹陷烃源岩厚度最大。烃源岩具有机质丰度中等,母质类型优良,成熟度主体偏高的特点。自始新世末期以来,伦坡拉盆地长期具有成藏的油源条件,早期的源岩为牛二段,晚期则以牛三下亚段为主。总体上看,伦坡拉盆地具良好的油气资源前景。

The source rocks of the Lunpola Basin were developed in the Tertiary Niubao formation and mainly in N-2 and lower N-3 members and some in upper N-3 member of the formation. Distribution of source rocks was controlled by sedimentary facies with deep- and subdeep-lake facies were their major developing area. The thickest source rocks were in Jiangri-Acuo depression. Source rocks were characterized by medium abundance of organic matter, good parent type and relative high maturity. Since the end of Eocene, there has been favorable source condition for hydrocarbon accumulation, and the early hydrocarbon came from N-2 member and the late one from lower N-3　member. In a word, there is good resource prospect in the Lunpola Basin.

https://doi.org/10.11781/sysydz199904340