A Study on The Evolution of Hydrodynamics, The Migration and Accumulationof Oil and Gas in The Songliao Basin
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摘要: 松辽盆地地下水动力场具有明显的不对称性：盆地北部大气水下渗形成向心流；中央坳陷区发育泥岩压榨水形成的离心流和越流泄水；盆地南部以越流—蒸发泄水为特征，只有盆地边缘和隆起区的顶部有大气水下渗。泥岩压榨水形成的离心流是松辽盆地油气运移的主要动力。古水文地质的旋回性和离心流的阶段性，决定了油气的阶段性运移和在一个独立水动力体系内多个油环在内，气环在外，与沉积凹陷同心的阶梯式—环带状油气分布规律.Abstract: The hydrodynamics field in the Songliao basin is obviously asymmetrical with the characteristics ofgravity- induced centripetal flow recharged by meteoric water mainly in its northern region, centrifugalflow and cross-formational flow in the basin center area, groundwater discharged by cross-formationalflow and evaporation in its southern area, and meteoric water permeating dow nwards only along thebasin rim and uplifted areas locally and unabidingly.Centrifugal flow caused by mudstone-compactedwater is the main dynamic force which induces the petroleum migration and accumulationin the Songliaobasin.Paleohydrogeologic cycles and centrifugal flow stages induced the migration by stages and step-mannular distribution of oil and gas in an independent hydrodynamic system.Multidepressions for theSongliao basin would have developped several hydrodynamic systems.Of which two major ones are lo-cated at the Sanzhao and Qijia-Gulong depressinons, and they made up a double step-annular distributionof oil and gas in the Songliao basin.Inside are multirings of oil, which are encapsulated by uncontinuousnatural gas pools.All of them are concentric with their depressions mainly due to symmetric and concen-tric centrifugal flow.
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Key words:
- hydrodynamics /
- migration and accumulation of oil and gas /
- Songliao basin
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