松辽盆地长岭断陷乾北次洼深层天然气成因判别  

The Origin of Deep Natural Gas of Qianbei Sub-Sag of Changling Fault Depression in Songliao Basin

作　　者：王伟明[1,2] 卢双舫 张淑霞 吴慧[2] 王贵磊[2] 文思亮 

机构地区：[1]中国石油大学非常规油气与新能源研究院,山东青岛266580 [2]东北石油大学地球科学学院,黑龙江大庆163318 [3]中国石油大学化学工程学院,山东青岛266580 [4]中国石油大学地球科学学院,北京102249

出　　处：《新疆石油地质》2013年第4期405-408,共4页Xinjiang Petroleum Geology

基　　金：国家973项目(2011CB211701)

摘　　要：乾北次洼是松辽盆地南部长岭断陷中最大的一个洼陷,但天然气勘探程度低。据天然气组分、同位素及轻烃分析等资料,结合烃源岩特征,对该洼陷深层天然气成因进行了分析。该洼陷深层烃源岩有机质丰度高、以腐殖型为主,营城组发育Ⅱ1和Ⅱ2型较好的烃源岩,处于过成熟阶段;天然气组分甲烷占绝对优势,乙烷同位素值偏轻,甲烷和乙烷具有明显的碳同位素倒转现象,甲烷来源于偏腐殖型母质,乙烷来源于偏腐泥型母质。Qianbei sub-sag is the biggest one in Changling fault depression in southern Songliao basin,with low degree of natural gas exploration.This paper analyses the origin of deep gas in this sub-sag using natural gas component,isotope and lighter hydrocarbon data,combined with the characteristic of hydrocarbon source rocks.The result shows that the deep source rocks are dominated by humus kerogen,characterized by high abundance of organic matter,and good source rocks of Type-Ⅱ1 and Type-Ⅱ2 are distributed in Yingcheng formation,with post-maturity evolution degree;methane accounts for absolute advantage of natural gas component,non-hydrocarbon gas content is low;ethane isotope value is somewhat lighter,methane and ethane have obvious carbon isotope reversal phenomenon,corresponding to different types of kerogens： the methane is partial humic type and the ethane partial sapropelic type.

关 键 词：松辽盆地 长岭断陷 乾北次洼 天然气成因 碳同位素 混合比例 

分 类 号：TE112.111[石油与天然气工程—油气勘探]