松辽盆地南部梨树断陷天然气轻烃地球化学研究  

Geochemical Characteristics of Light Hydrocarbon in Natural Gas from Lishu Fault Depression in Songliao Basin

作　　者：高丽丽[1,2] 张敏[1,2] 赵红静[1,2] 

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室,湖北荆州434023 [2]长江大学地球化学系,湖北荆州434023

出　　处：《天然气地球科学》2011年第4期709-714,共6页Natural Gas Geoscience

基　　金：国家重大专项"大型油气田及煤层气开发"项目(编号:2008ZX05007-001-01)资助

摘　　要：对松辽盆地南部梨树断陷八屋、孤家子、后五家户、皮家等油气田天然气样品的C6—C7轻烃化合物首次开展了系统的地球化学对比研究,结合天然气碳同位素组成特征,认为研究区天然气样品普遍贫芳香烃,绝大多数样品C6—C7饱和烃具链烷烃优势,尤以正构烷烃含量最高,环烷烃含量相对较低,表明该区天然气的母质类型主要为腐泥型;研究区Mango轻烃稳态动力学常数K1基本保持恒定,来自湖相烃源岩的C7轻烃中三环优势(3PR)大于五环优势(5PR)和六环优势(6PR),与Mango的结论一致。庚烷值、异庚烷值多较高,寓示该区天然气主要为高熟—过熟的裂解气,与该区天然气甲烷碳同位素组成普遍偏重相吻合。We comparatively studied the geochemical characteristics of C6-C7 light hydrocarbons in natural gas from Lishu fault depression in Songliao basin for the first time. Combined with characteristics of carbon isotope,results showed that natural gas from Lishu fault depression is very poor in aromatic hydrocarbon but rich in chain alkanes. Among the components of C67 light hydrocarbon,n-alkanes have the content advantage and naphthenes have the lowest content. The distribution characteristics suggested that the natural gas originated from sapropelie organic matter. The ratio K1 is around 1 and the three-ring preference （3RP） is greater than 5RP and 6RP in C7 light hydrocarbon from lacustrine facies source rocks,which were basically consistent with the conclusion of light hydrocarbons by Mango, The high value of paraffin index and heptane index indicated that the natural gas is mainly pyrolysis gas which coincides with the high value of δ^13C1.

关 键 词：梨树断陷 松辽盆地 地球化学特征 轻烃 天然气 

分 类 号：TE122.113[石油与天然气工程—油气勘探]