摘要
塔里木盆地是一个多旋回叠合盆地,下古生界烃源岩具有典型的二次生烃特征.当前关于二次生烃的研究集中在通过热模拟方法认识生烃机理和模式等方面,关于典型盆地二次生烃发生范围、分布规律、影响因素研究相对较少.本文在认识塔里木盆地构造背景和热演化规律的基础上,选取不同构造单元具有代表性的50余口井,利用Basin Mod 1D盆地模拟软件对多口井进行烃源岩成熟史模拟,结合现有的镜质体反射率数据,研究奥陶系和寒武系烃源岩是否存在二次生烃以及二次生烃发生时期和规律.综合分析单井模拟结果发现,奥陶系烃源岩二次生烃发生范围分布在沙雅隆起、卡塔克隆起中部和古城墟隆起西端,寒武系烃源岩二次生烃发生范围分布在沙雅隆起、巴楚隆起和卡塔克隆起中部.不同构造单元二次生烃开始的时间不同.二次生烃生烃史受盆地构造-热演化史控制,且对油气藏形成和分布有一定影响.
Tarim basin is a typical multicyele and multiplex basin, the hydrocarbon generation history of Lower Palaeozoic source rock is characterized by secondary hydrocarbon generation. The former studies mostly converned the aspects such as the mechanism and mode of hydrocarbon generation. Researches about the region, regularities of distribution and influencing factors of secondary hydrocarbon generation about a typical basin are relatively fewer. The authors model the tectono-thermal evolution and hydrocarbon generation history of typical wells in different structural units, then discuss the feasibility, periods and characteristics of secondary hydrocarbon generation of the Lower Paleozoic source rock in different structural units. Synthetically analyzing the structural evolution and thermal history of typical wells can give the possibility and the period and region of secondary hydrocarbon generation. The main aro~ nf Ahydrocarbon generation of Ordovician source rock are distributed in the Shaya uplift, the middle part of Katake uplift, and the west part of Guchengxu uplift. And for Cambrian strata, it is in Shaya uplift, the middle part of Katake uplift, and Baehu uplift. The starting time of secondary hydrocarbon generation in different structural units is different. The tectono-thermal evolution controlled the secondary hydrocarbon generation. Reservoir formation was affected by secondary hydrocarbon generation.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第7期1863-1873,共11页
Chinese Journal of Geophysics
基金
国家重点基础研究发展计划项目(2005CB422102)
中石化海相前瞻性项目(YPH08057)共同资助
关键词
塔里木盆地
下古生界
构造热演化
二次生烃
Tarim basin, Lower Palaeozoic, Tectono-thermal evolution, Secondary hydrocarbongeneration
