摘要
松辽盆地中地壳有一低速—高导层(也称塑性层),中地壳的塑性层与松辽盆地的成因以及盆山耦合系统有关.盆地地幔流体活动有下列表现:(1)高热流、高地温场;(2)深大断裂与火山岩喷溢;(3)碱交代作用(如钠长石化、伊利石化);(4)Mg2+交代作用(如白云石化)等等.地球化学省与地球化学急变带控制了大油气田的分布并显示了盆地发生的壳—幔相互作用.中地壳的低速—高导层不是岩浆岩,而是一充满地幔流体的地质体,它们富含氢、碱金属(K+、Na+)、卤素(F-、Cl-)、碳(甲烷、CO、CO2)、氮、硫等.在中地壳的温度压力条件下,在Fe、Ni等催化剂的参与下,H2与CO(CO2)可发生费—托合成烃的反应.实验表明:这个反应不仅可生成气态烃还可生成液态烃,并将发生碳同位素分馏作用.松辽盆地的U形运移模型受到质疑.按照石油无机生成的模型,松辽盆地的深部将会有更多的石油与天然气,庆深气田的发现便是一个明证.
There is a low velocity-high conductive layer in the mid-crust of the Songliao Basin. This plastic layer of mid-crust is connected with the origin of the Songliao Basin and the basin-mountain system. In the basin, there are some features of mantle fluids ： （ 1 ） high heat flow ; （2） deep-large faults and volcano eruption ; （3） alkaline metasomatism （albitization） ; （4）Mg^2＋ metasomatism（dolomitization）, and so on. Geochemical provinces and geochemical steep gradient zones control the distribution of the giant oil and gas reserviors and display the crust-mantle interaction. It is shown that the low velocity-high conductive layers of mid crust is rich in mantle fluids, such as： hydrogen（H）, alkaline（K^＋ , Na^＋ ）, saline（Cl^- , F ^-）, carbon（CH4 , CO2, CO）, nitrogen（N）, sulphur（S） and so on. At the temperature and pressure of mid-crust, H2 and CO（CO2 ） can generate hydrocarbon with the Fischer-Tropsch synthesis（under the presence of Fe,Ni catalyst）. The experiments show that this reaction can not only produce gaseous hydrocarbon, but also produce liquid hydrocarbon, and it also can produce carbon isotope fractionation. The hypothesis of oil gas U-type migration model in the Songliao Basin is questioned. According to this hypothesis of petroleum inorganic origin, there are much more oil and gas reserves in the deep crust.
出处
《地球物理学进展》
CSCD
北大核心
2008年第5期1507-1513,共7页
Progress in Geophysics
基金
中国石油天然气股份有限公司"松辽盆地北部岩性油气藏和深层油气综合评价与目标优选"项目(050104-2)资助
关键词
中地壳
低速—高导层
地幔流体
费—托合成
石油的无机成因
松辽盆地
mid crust, low velocity high conductive layer, inorganic origin of petroleum, mantle fluid, Fischer Tropseh synthesis, Songliao Basin
