胜利油气区非烃类气藏形成条件及分布规律探讨  

DISCUSSION ON FORMATION AND OCCURRENCE OF NON HYDROCARBON GAS RESERVOIR IN SHENGLI OIL GAS AREA

作　　者：贾俊德[1,2] 李昌谷[1,2] 

机构地区：[1]胜利石油管理局地质科学研究院 [2]胜利石油管理局职工大学

出　　处：《天然气工业》1997年第2期11-17,共7页Natural Gas Industry

摘　　要：胜利油气区位于渤海湾伸展盆地的济阳坳陷和昌潍坳陷的潍北凹陷，是我国东部无机成因非烃类气的富集区，目前已发现二氧化碳气藏６个，探明气储量一百余亿立方米，揭示该区具勘探非烃类气藏的较大前景。为进一步寻找非烃类气藏，对该区二氧化碳气藏的成藏条件和分布规律进行了研究。研究认为，该区中、新生代由于受世界强烈板块活动的影响，地幔软流圈发生隆起，导致区内地壳变薄、大型断裂发育、岩浆活动频繁和岩石圈内的碳酸盐岩产生热变质作用，使大量壳—幔型二氧化碳等非烃类气体迅速释放，并在沿运移通道附近的有利圈闭中聚集、成藏，从而使区内具备了形成非烃类气藏的有利地质条件。已知气藏的分布表明，非烃类气藏主要沿气源断裂带、热变质作用发育带、软流圈隆起区和大地热流、氦同位素异常区及其周围的有利圈闭规律地分布，这些地区和部位是今后勘探非烃类气藏的有利地区。Located in Weibei Sag of Jiyang depression and Changwei depression in Bohai Bay extensional basin,Shengli oil gas region is the enrichment area of abioganic non hydrocarbon gas in eastern China.6 CO 2 reservoirs have been discovered and the proved reserves are above 10 10 m 3,which indicates this region is of larger exploration potential for non hydrocarbon gas reservoirs.As this region was influenced by violent plate movement in Mesozoic and Cenozoic era,mantle asthenosphere bumped up,which makes the regional earth crust thinner,large faults developed magmation frequent and the thermal metamorphism of the carbonate rocks in lithosphere occuring,so that a lot of non hydrocarbon gases cuch as crust—mantle CO 2 etc,were quickly released and non hydrocarbon gas reservoir were formed in the favourable traps along migration pathway.The distributions of the existing gas reservoirs in the area showes that non hydrocarbon gas reservoirs are mainly distributed along faults cutting throagh gas source rocks,thermal metamorphism belts,asthenospheric “bumps”,and the areas with abnormal terrestrial hrat flow and hellum isotope as well as the favourable neaby traps.

关 键 词：油田 无机成因 二氧化碳 勘探区 气藏形成条件 

分 类 号：P618.130.1[天文地球—矿床学]