松辽盆地徐家围子断陷火山岩气藏天然气成因类型和气源对比  

Genetic types and source correlation of natural gases in volcanic reservoir of the Xujiaweizi Fault-Depression,Songliao Basin

作　　者：刘伟[1] 刘安英[1] 

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《地质科学》2009年第2期571-584,共14页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家重点基础研究发展计划(编号:2009CB219308)资助

摘　　要：松辽盆地徐家围子断陷发育营城组火山岩气藏。钻井统计、地球化学特征及天然气组份分析和碳同位素研究表明徐中和徐东地区天然气源岩有机质偏腐泥型,生气潜力更大。对主力源岩层沙河子组和次要源岩层营城组源岩分布有了新的认识。对营城组天然气的烃类气体和CO_2气的来源进行对比和探讨,认为烃类气受气源的控制,CO_2气藏受深大断裂的控制,与火山岩分布关系不大。连通地幔的气藏中,也没有发现无机烃类气体聚集。徐家围子断陷营城组天然气以烃类气占绝对优势,而且主要为甲烷,二氧化碳成藏并不普遍。天然气甲烷成因类型以煤型气为主,甲烷碳同位素变化范围较小。乙烷、丙烷和丁烷碳同位素均有较大的变化范围,而且具有较好的相关性,说明母质类型多样,乙烷、丙烷和丁烷具有相同的来源。含量大于50%的二氧化碳来源于地幔,属无机成因。含量小于50%的二氧化碳既有无机成因,也有有机成因。The natural gas of volcanic reservoir in the Xujiaweizi Fault-Depression, Songliao Basin, was mainly stored in Members 1 and 3 ,Yingcheng Formation in age of Early Cretaceous. Three nearly N-S fractures and two W-E uplifts divided the depression into five blocks, and characters of natural gas had some differences in each block. Bounded by the Shengping Uplift,the Member 3 ,Yingcheng Formation developed to the north of the uplift,while the member 1 of the formation occurred to the south of the uplift. The total thickness of the volcanic formation of the two members was 50 to 1 500 meters,with an average thickness being 600 meters. Natural gas reserve mainly（about 79.5% ）came from the volcanic formation of Yingcheng Formation. The charateristics,genetic types, source and distribution of natural gas were studied in the paper. Most of natural gas in the volcanic reservoir was hydrocarbon gas, with a genetic type being coal-type gas. The hydrocarbon gas was controlled by the source rocks ,while the carbon dioxide reservoir was constrained by the deep fractures. Furthermore, the paper explored source regions of the natural gas in the Xujiaweizi Fault-Depression,and discovered that the hydrocarbon gas and carbon dioxide gas had varied source regions.

关 键 词：火山岩气藏 天然气成因类型 烃源岩 气源对比 徐家围子断陷 松辽盆地 

分 类 号：TE122.3[石油与天然气工程—油气勘探]