摘要
讨论了烃源岩生、排烃史模拟原理与方法.模拟研究了伦坡拉盆地18个井点牛二段、牛三段与丁一段烃源岩的生、排烃史.结果表明,该盆地地温梯度高、有机质类型好、有机碳含量高.主要烃源岩牛二至牛三段下部,生烃时间早,生烃强度大;排烃时间主要在始新世至渐新世.而牛三段上部至丁一段下部,生烃强度小;排烃时间主要在新第三纪.由于伦坡拉盆地主要构造圈闭形成于渐新世以后,晚于主要烃源岩牛二至牛三段下部的主排油期,不利于油气聚集成藏,因此应加强非构造油气藏的勘探.
The simulation concept about hydrocarbon(HC)generation and expulsion history is discussed.The simulation has been made of HC generation and expulsion of the source rocks of Niu-2,Niu-3 and Ding-1 of 18 wells in Lunpola Basin.The results show that the basin has high geothermal gradient,good types of organic matter,and high content of organic carbon.The main source rock,the Niu-2 to lower Niu-3,generating HC early,had large intensity of generation,expelling HC mainly in Eocene to Oligocene.The second source rock,the upper Niu-3 to lower Ding-1,had small intensity of generation,expelling HC chiefly in Neogene.Because the structural traps were formed in Lunpola Basin after Oligocene later than the main expulsion period of Niu-2 to lower Niu-3,they were unfavourable for forming structural oil póols.Therefore,the nonstructural reservoirs should be no- riced in the exploration.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
1996年第2期179-183,共5页
Earth Science-Journal of China University of Geosciences
基金
国家"八五"西藏地勘专项科研成果.
关键词
烃源岩
成藏条件
伦坡拉盆地
西藏
油气藏
source rock
history of HC generation
history of HC expulsion
numeric simulating
forming condition of oil reservoir
Lunpola Basin
Xizang.
