关于松辽盆地北部油气勘探如何突破的思考

REFLECT ON HOW TO MAKE A BREAKTHROUGH IN HYDROCARBON EXPLORATION IN NORTH PART OF SONGLIAO BASIN

松辽盆地北部在大庆油区建设中如何取得突破，是油气勘探工作者的中心任务。新理论、新观念、新认识就是油气勘探的新领域。松辽盆地存在沉积岩、火山岩兼有的“水火”二元结构地层；ＮａＨＣＯ３型地层水环境中出现Ｎａ２ＳＯ４、ＣａＣｌ２、ＭｇＣｌ２型地层水；具有δ１３Ｃ１＞－２５‰及δ１３Ｃ１＞δ１３Ｃ２＞δ１３Ｃ３特征的烷烃气藏；具有δ１３ＣＣＯ２＞－９‰的ＣＯ２气藏；二叠系浅变质板岩中含烃量达数千毫克每千克；原油中有１７种在生物物质中不见的元素；原油中含有地壳中稀缺而地幔中丰富的铼；盆地边缘有利生油区以外发现了富拉尔基油田和太平庄气田；油气田（藏）沿深大断裂分布；于基底花岗岩风化壳见工业气层；火山岩见产量最高的工业气层等十大特异地质现象。说明松辽盆地存在有机生烃、无机生烃及合成生烃机制，存在区带生烃、灶体生烃、催化生烃、无机气态烃、无机液态烃及气态合成烃等多种生烃模型；存在圈控型与源控型含油气系统。因此，松辽盆地北部应有较多的油气勘探新领域。

Ten major abnormal geological phenomena exist in Songliao Basin, i.e: the formation of Songliao Basin is binary structure formation with both sedimentary rock and volcanic rock; Na 2SO 4, CaCl 2, Mgcl 2 type formation water appear in enviroment of NaHCO 3 type formation water; there exists paraffine gas reservoir with property of δ 13 C 1> 25‰ and δ 13 C 1>δ 13 C 2>δ 13 C 3; there exists CO 2 gas reservoir with δ 13 C>-9‰in CO 2; hydrocarbon content in Permian shallow metamorphosed slate reaches several thousand mg/g; 17 elements in the petroleum cant be seen in biological material; rhenium, which is poor in crust and rich in mantle, is beared in petroleum; Fulaerji oil field and Taipingzhuang gas field are found outside favoral oil-generating zone in peripheral basin ; oil and gas fields (reservoir) distribute along large rupture; commercial gas layer is found in basal granite weathering crust; commercial gas layer with highest production is in vocalnic rock etc. All these demonstrated that there exist organic hydrocarbon generation, inorganic hydrocarbon generation and synthetic hydrocarbon generation mechanism in Songliao Basin, and exist several hydrocarbon generation model such as band hydrocarbon generation, kitchen hydrocarbon generation, catalysis hydrocarbon generation, inorganic gas hydrocarbon, inorganic liquid hydrocrbon and gas synthetic hydrocarbon and source rock-controlled hydrocarbon-bearing systems. So there should be many new domains for hydrocarbon exploration in north part of Songliao Basin.