考虑岩石变形的火山岩气藏数值模拟研究

随着油气勘探技术的提高,在我国东部松辽盆地深层发现了具有广阔前景的火山岩气藏,具有岩石类型多,岩性复杂,岩性岩相变化快,储层微裂缝较发育,物性差,非均质性强,应力敏感性强的特点。针对火山岩气藏地质条件的复杂性,通过实验研究了该类气藏开采过程中岩石的变形特征及其对渗透率和气井产能的影响。建立了考虑岩石裂缝变形的双重介质气藏数值模拟模型,并利用该模型进行了岩石裂缝变形对开发效果影响的模拟研究,为火山岩气藏的有效开发提供了一定的科学依据。

NUMERICAL SIMULATION STUDY OF VOLCANIC GAS RESERVO IR W ITH ROCK DEFORMATION

With the improvement of oil and gas exploration technology, a volcanic gas reservoirwith good developmentpotential has been found for the first time in deep zone of Songliao Basin,North-East of China. The pay zone is characteristic of various rocks, complex lithologies, sharp lateral variations of lithologies and lithofacies, developed microcrack, poor physical property,serious anisotropy and stress sensitivity. In this paper, according to the geological complexity in the volcanic gas reservoir, its deformation character and the effect on the permeability and productivitywere researched through laboratory experiments. On the base of experiment results, considering the rock-crack deformation, a numerical simulationmodel of the double rositymedia gas reservoirwas established, and the recovery effect caused bythe rock-crack deformation was also been simulated. It can be said that the research of this paperprovides some scientific references for the effective development of volcanic gas reservoirs.