东濮凹陷深层异常温压条件下的油气生成特征

运用石油与天然气生成理论,讨论了东濮凹陷深层异常温压条件下烃源岩热演化的异常现象。研究表明,与正常压力油气热演化规律相比,异常高压作用下,烃源岩热演化程度明显偏低,有机质热演化程度与其受热史不匹配,有机质的热演化明显受到抑制。只有地层压力达到一定门限值时,才会明显发生这种现象。在东濮凹陷,当压力系数大于1.5时,有机质的热演化出现明显异常。对深层异常温压条件下烃源岩的生烃潜力研究表明,深层烃源岩仍然具有较高的生烃潜力。同时对该区深层含烃流体相态、储集性及深部盖层封闭性能等问题进行的分析表明,东濮凹陷深层异常温压条件下油气勘探具有良好前景

Hydrocarbon generation features of deep formation in Dongpu Depression at abnormally high temperature and high pressure

By using oil and gas generation theory,the abnormal phenomena during thermal evolution of hydrocarbon source rock in the deep formation of Dongpu Depression were discussed.It is indicated that the thermal evolution extent of hydrocarbon source rock at abnormally high pressure is not match with its thermal history undergone and is lower than that under the normal pressure condition.The anomalous phenomena occurred only at a certain threshold of the formation pressure factor.When the pressure factor is more than 1.5 in Dongpu Depression,there happens an obvious abnormal phenomenon.The hydrocarbon source rock in deep formation of Dongpu Depression shows that there still has a great source potential and will generate enough oil and gas for forming deep reservoirs.A comprehensive analysis on flow phase of hydrocarbon_bearing fluid,reservoir characteristics and the sealing of cap rock in deep formation shows that there is a good exploration future in the deep formations of Dongpu Depression at the abnormal temperature and pressure.