更新勘探观念,开拓深层油气新领域

生油岩(烃源岩)是一个具有诸多不确定因素的概念。这个概念长期以来禁锢着人们的思想。已故的乌克兰科学院院士波尔菲利也夫提出了油气深部起源的理论,即石油的形成与上地幔的活动有关,于第三纪末由上地幔沿大断裂带进行垂直运移并在基底及沉积盖层的孔隙-裂隙岩石储集层中聚集而形成油气田。美国在墨西哥湾盆地的超深钻探证实于6885m的深度仍有油藏存在。有理由认为在盆地基底以下纵深部位的结晶岩、变质岩中,如有破碎带、裂隙带存在,这将是深部油气贮存的地方。因此,发展深部钻探将会开拓油气藏的新领域。

Renew exploration concept and open up frontiers in deep strata

Source rock, a concept with many uncertainties, has confined the thoughts of explorationists for a long time. V.B.Porfiriev, the late Academician of Ukraine Academy of Sciences, proposed a theory of deep origin of hydrocarbons, i.e. generation of hydrocarbons has been related to activities of the upper mantle. At the end of Tertiary, hydrocarbons migrated vertically upward from the upper mantle along large fracture belts and accumulated in the porous-fractured reservoirs in the basement and sedimentary cover. Deep and ultra-deep drilling in Gulf of Mexico has verified that oil pool can occur in reservoir up to a depth of 6 885 m. It is justified to believe that should fractured zones exist in the deep crystalline and metamorphic rocks below the basin's basement, they would be the petroleum occurrences. Therefore, it would be possible to open up frontiers of petroleum exploration through deep drilling.