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首次对鄂尔多斯盆地中生界油藏压力进行了研究,发现中生界油藏主要为超低压油藏,并且不同地区和不同层位油藏的异常低压差别显著.研究结果表明,随着地层剥蚀厚度增大和油藏抬升后温度降低值增加,储层压力系数呈减少趋势;延长组油藏抬升温度降低后使储层孔隙水的体积收缩量达0.82%~1.94%.这些指示了盆地在白垩纪末期长时间强烈抬升,地层剥蚀和古地温降低作用是形成低压油藏的主要原因.认为鄂尔多斯盆地中生界这种低压封闭体系对油藏的保存有利,同时对油藏调整、油气运移再富集和油水分布等成藏方面可能起到了重要作用.提出了陕北地区长6低压油藏由东南向西北方向富集和长7砂岩透镜体不含水低压油气藏形成,均与这种低压封闭体系分布密切相关.
It is the first time to study the pressure of the Mesozoic reservoir in the Ordos Basin and find that the Mesozoic reservoirs are mainly ultra-low pressure reservoirs, and there are significant differences in the abnormal low pressure between reservoirs in different areas and in different strata.The results show that with the strata denudation The increase of thickness and the decrease of temperature after reservoir uplift, the pressure coefficient of reservoir shows a decreasing trend, and the volumetric shrinkage of reservoir pore water reaches 0.82% -1.94% It is suggested that the low pressure seal system of Mesozoic in the Ordos Basin is favorable for the preservation of reservoirs, and at the same time, the adjustment of reservoirs, the migration of oil and gas Re-enrichment and oil-water distribution, etc. It is suggested that the Chang 6 low-pressure reservoir in north Shaanxi area be enriched from southeast to northwest and that the Chang 7 sandstone does not contain water and low pressure reservoirs, Low-pressure closed system is closely related.