摘要
从恢复古构造的途径可以计算出断陷盆地各发展阶段的拉张量。渤海盆地中各坳陷在早第三纪各阶段拉张量表明,盆地经历了始新世与渐新世的拉张旋回,而渐新世的拉张旋回又可分为两个亚旋回,在时空上,拉张活动具很大的不均衡性。在每一拉张旋回中,盆地内都发育了重要的生油岩。早、中期拉张活动强烈的沉积凹陷,油气主要富集于下第三系及其基底构造层中,晚期拉张活动仍较强烈,以及晚第三纪早期仍有一定活动性的沉积凹陷,则可以形成上第三系次生的油气富集。针对各沉积凹陷的含油气特点进行挖潜,可进一步提高渤海盆地的油气潜力。
The magnitude of extension of a faulted basin in developing stages can be obtained by means of restoring its palaeostructural cross-section. The extension variation of the depressions in the Bohai basin clearly suggests that the basin was experienced Eocene and Oligocene extension cycles, and the latter involves two subcycles. Chronologically and spacially, the extension was greatly uneven and the source rocks developed in each cycle. For the sedimentary depressions with intensive extension in Eocene and early Oligocene, hydrocarbon was mainly accumulated in Lower Tertiary and basement layers, for those with intensive extension in late Oligocene and slight activities in Neogene, secondary hydrocarbon was trapped mainly in Neogene layers, In accordance with the properties of hydrocarbons in each sedimentary depression, further exploration may greatly widen the prospect of the Bohai basin.
出处
《石油学报》
EI
CAS
CSCD
北大核心
1990年第2期1-12,共12页
Acta Petrolei Sinica
