松南长岭断陷东部深层天然气勘探潜力分析

松辽盆地南部长岭断陷为古生界变质基底上发育的箕状断陷,沙河子组发育厚度较大的深湖相黒色泥岩,有机质丰度高,热演化程度高,生烃强度大,具备很好的天然气资源基础.断陷期发育2套火山岩,其中营城组爆发相、溢流相火山岩大面积分布,岩性以酸性流纹岩、凝灰岩、火山角砾岩等为主,孔洞发育,储集物性较好.长岭断陷东部发育2个大型古隆起,断裂发育,天然气运聚条件较好,目前已发现3个气藏3个含气构造,是寻找大型天然气藏的最有利地区.

Deep Gas Exploration Potential Analysis of the Eastern Changling Fault in the South of Song-Liao Basin

The Chang-ling Fault is a half graben rift which developed on the Paleozoic metamorphic basement.It is developed quite big thickness deep lacustrine facies black mudstone in Shahezi formation,with high abundance of organic matter,high thermal evolution degree,high hydrocarbon-generating intensity,thus it possess good basis of nature gas accumulation.Faulted period develop two suits of volcanic rocks,which Yingcheng formation distribut of large areas of burst facies and overflow facies volcanic rocks,the lithology are mainly of acid rhyolites,tuffs and volcanic breccias,with rich cavities and great reservoir physical properties.The eastern chang-ling fault develops two large ancient uplifts,with fault developing and good gas migration and accumulation.It have found three gas reservoirs and three gas bearing structures,that is a great favorable area of finding large-scale gas reservoirs.