积极开展无机成因油气领域的勘查─—无机成因油气是油气资源战略后备领域

TAKING A VIGOROUS ACTION TO EXPLORATION OF INORGANIC-SOURCED HYDROCARBON

无机成因油气领域可能存在比有机油气领域大得多的油气潜量．无机成因油气的成欧条件是：要有岩石圈级深大断裂作通道，以及无机控类运移到地壳表层的过程中不被氧化．根据这些条件和岩石圈结构特征，提出了2种无机成因油气可能成藏的模式；一是在有较厚的还原环境沉积段（在还原环境沉积段中，氧逸度低，无机烃类可以保存不被氧化）的裂谷系或裂陷盆地（这些盆地一般都有与岩石圈底部相通的深大断裂）内的有关圈闭中成藏，往往与有机油气混合成藏；二是在与裂陷盆地相邻共生的隆起区内，水平破裂带（地壳深部烃类的储集体）隆升后的残留体（是理想的裂隙圈闭）．在此基础上，指出了无机油气的有利远景区以及勘查无机油气领域的方法．

There may be much more hydrocarbon in inorganic-sourced domain than in organic-sourced domain.Conditions for accumulation of inorganic-sourced hydrocarbon are as follows: (1)large deep fault to lithosphere as migration path; and (2)the hydrocarbon was not oxidated in process of migrating to crust sur-face. The accumulation pattern was suggested in accordance with above conditions and lithospheric struc-ture: (1) traps in rift system or rift basin with thick sediments of reducing environment, which mixed withorganic hydrocarbon; and (2) residuals of lifted horizontal zone of fracture neighbering rift basin. The prospects of inorganic hydrocarbon and their exploration method were indicated.