柴达木盆地石炭系油气资源调查评价进展

柴达木盆地是我国大型含油气盆地之一,已经发现的油气主要来自中新生界地层。作者通过近年来对柴达木盆地石炭系油气资源的调查研究,证实柴达木盆地内石炭系地层分布广泛,厚度大。石炭系分布范围达10万km2。厚度大于1000m的范围达5.71万km2。盆地石炭系发育良好的烃源岩,石炭系地层普遍发育厚层油砂,显示石炭系具有很好生烃能力和油气运移过程。石炭系构造变形主要发生在新近纪末,之前的构造变形较弱,有利于石炭系油气保存。初步评价柴达木盆地石炭系油气资源量为6.14×108～7.23×108t。显示柴达木盆地石炭系油气资源潜力很大,是油气资源战略突破的新领域。

The Progress of Carboniferous Oil and Gas Investigation and Assessment in Qaidam Basin

The Qaidam Basin is one of China’s large petroliferous basins,and oil and gas have been found mainly in Mesozoic and Cenozoic strata.Through the investigation of Carboniferous oil and gas resources of Qaidam Basin in recent years,the authors have confirmed that the Carboniferous strata are widely distributed and in large thickness in the Qaidam Basin.The Carboniferous distribution is 10 km2.The area greater than 1000 m in thickness is 5.71 km2.Carboniferous strata having well-developed source rocks are widely developed in the thick layer of oil sands,suggesting that Carboniferous strata have a good capability for hydrocarbon generation and oil and gas migration process.Carboniferous tectonic deformation occurred mainly in late Neogene,and prior to this period,tectonic deformation was weak,which was favorable for Carboniferous hydrocarbon preservation. Preliminary evaluation of the Carboniferous oil and gas resources in Qaidam Basin amounts to 6.14×108-7.23×10 8t,implying that Qaidam Basin has large Carboniferous oil and gas resource potential and serves as a new area for strategic breakthrough in oil and gas resources exploration.