松辽盆地梨树断陷天然气成因类型及勘探方向  

Genetic types of natural gas and its exploration direction in Lishu fault sag,Songliao Basin

作　　者：宋振响[1] 顾忆[1] 路清华[1] 周卓明[1] 李贶[1] 

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所,江苏无锡214126

出　　处：《石油学报》2016年第5期622-630,共9页Acta Petrolei Sinica

基　　金：中国石油化工股份有限公司科技开发部项目(P09026)资助

摘　　要：随着松辽盆地梨树断陷金山地区典型煤型气的发现,梨树断陷天然气来源及成因成为一个亟需研究的问题。结合梨树断陷天然气的发现情况,在天然气的组分组成、轻烃参数及组分碳同位素分析的基础上,讨论了不同地区天然气的来源及成因。研究表明梨树断陷天然气除J2井外,主要为有机成因气,且存在单源型和混源型2种类型:单源型气主体为油型气,而金山地区为典型的煤型气;梨树断陷天然气混源现象普遍,其中孤家子、后五家户和新立地区浅层主要为煤型气和油型气的混合,四五家子地区还可能有生物气的混入。母质类型较好的沙河子组二段烃源岩为梨树断陷的主力油气源岩,小宽断裂和秦家屯断裂之间为该套烃源岩的有利分布区,下一步有望获得油气突破;金山地区煤型气的发现揭示火石岭组和沙河子组一段煤系源岩具备充足的生气能力,东南斜坡带煤型气有望获得新的突破。With the discovery of coal-type gas in Jinshan area, it has b e c o m i n g a pressing research topic to study the origin a n d genetictypes of natural gases in Lishu fault sag. C o m b i n i n g with the natural gas distribution, this paper discussed the natural gasorigin a n d genetic types in Lishu fault sag based o n the analysis of gas c o m p o n e n t composition, light hydrocarbon parameters andcarbon isotopic compositions. T h e result indicates that the natural gases in Lishu fault sag are mainly organic origin with the exceptionof the gas f r o m J2 well. T h e gas type can be divided into t w o categories, monophyletic type a n d m i x e d type respectively.T h e monophyletic type gases are mainly oil-type gas while the gases f r o m Jinshan area are coal-type gas. M i x e d type gases arevery c o m m o n in Lishu fault sag, the gases f r o m Gujiazi,H o u w u j i a h u and Xinli are m i x e d with oil-type gas a n d coal-type gaswhile the gas f r o m Siwuji^zi are m i x e d with thermogenetic gas and biogenetic Gas. T h e mainly source rock formation in Lishufault sag is K sh2 , with the type U i k e r o g e n s,the region b e t w e e n X i a o k u a n fault and Qinji^tun fault m a y b e a favorable distributionarea for this high-quality source rocks and also a g o o d target. T h e discovery of coal-type gas in Jinshan area revealed that thepotential of gas generation f r o m K a h a n d K a sh1 coaly source rocks are very huge, coal gas is expected to obtain a n e w breakthroughin southeast slope belt.

关 键 词：碳同位素 轻烃 天然气成因 勘探方向 梨树断陷 

分 类 号：TE122.1[石油与天然气工程—油气勘探]