摘要
对柯坪地区的烃源岩进行的综合定性研究表明 ,烃源岩可分为寒武系、奥陶系、石炭系和二叠系四套主要源岩层系。其中二叠系烃源岩发育较好、有机质丰度也相对较高 ,但演化程度低 ,使其生油量受到了限制 ;石炭系发育厚度最大 ,但有机质丰度低、类型差 ,其生油能力最低 ;奥陶系源岩虽发育厚度较薄 ,但其中有机质丰度很高、有机质类型很好 ,又正处于生油高峰演化阶段 ,尤其是萨尔干组和印干组生油层是本区最优生油岩 ,因此奥陶系烃源岩是研究区内的最优生油层系 ;最下部的寒武系地层虽发育厚度较大、类型较好 ,但由于有机质丰度低、成熟度过高 ,导致其生油量低于奥陶系源岩 。
The source rocks in Keping area of Tarim basin are studied synthetically and qualitatively by combining the previous findings with the analytical data of samples from drilling cores and the section outcrops.The source rocks composed of carbonate rock and pelites may be mainly defined into four oil-generating formations:Cambrian(∈), Ordovician(O),Carboniferous(C) and Permian(P).In P formation, the source rock is thicker,and its abundance of organic materials is relatively high.The nature of organic matter of Balikelike(P1b) and Kupukuziman(P1kk) series is also good,but they have lower maturation level,therefore, their oil-generating amounts are limited.C formation is the thickest one in this area,but the richness and type of organic matter are poor.Its contribution to the generation of oil is the least.Although thickness of O formation source rock is thinner,their richness and type are all better,and the maturation level is situated at the oil-generating peak stage. Especially the Salgan(O1~2s) and Yingan(O3y) series are the best source rocks, and the O formation is the excellent one in the area.Although the thickness and nature of the bottom of the ∈ formation are good,but its richness of organic matter is lower,and its evolution degree is too high to generate more crude oil relatively than that of O formation,but it still may generate considerable condensate and gas.\;
出处
《新疆石油学院学报》
2001年第1期22-25,共4页
Journal of Xinjiang Petroleum Institute
基金
中国石油天然气集团公司科技攻关项目! (96 - 111- 0 1- 0 6 )
关键词
塔里木盆地
柯坪地区
有机质
烃源岩
定性评价
Tarim basin
Keping area
Organic matter
Source rocks
Qualitative evaluation
