断裂对泥岩盖层破坏程度综合定量研究方法及其应用

为了研究断裂在油气聚集与保存中的作用,在断裂对泥岩盖层破坏作用机理及影响因素研究的基础上,采用断裂断距与泥岩盖层厚度比较和断层岩排替压力与泥岩盖层排替压力比较的研究方法,建立了一套断裂对泥岩盖层破坏程度的综合定量研究方法。并选取构造盆地徐家围子断陷营城组14个火山岩气藏中的断裂为例,对其对火山岩气藏泥岩盖层破坏程度进行了综合定量研究,结果表明,徐家围子断陷营城组14个火山岩气藏断裂对泥岩盖层的破坏程度仅个别较强其余以弱为主,有利于天然气的聚集与保存,这是断陷营城组火山岩中能找到大量天然气藏的一个重要原因。这一应用结果表明该方法用于断裂对泥岩盖层破坏程度综合定量研究是可行的。

A Comprehensive Quantitative Research Method of Destroy Degree of Faults to Mudstone Caprock and Its Application

To study role of fault to mudstone caprock in oil-gas accumulation and presentation, based on the study of destroy mechanism of fault to mudstone caprock and its influence factors , a comprehensive quantitative research method of destroy degree of faults to mudstone caprock were established by the method contrasting between fault distance and thickness of mudstone caprock and contrasting between displacement pressure of fault rock and displacement pressure of mudstone caprock. Used faults in mudstone caprocks of 14 Volcanic gas reservoirs of k1yc in Xujiaweizi depression as an actual example ,their destroy degree to mudstone caprocks of 14 Volcanic gas reservoirs of k1yc in Xujiaweizi depression was studied comprehensively and quantitatively .The result indicate that destroy degree to mudstone caprocks of 14 Volcanic gas reservoirs of k1yc in Xujiaweizi depression was evaluated to be weak, destroy degree to mudstone caprock in only two gas reservoirs can get to stronger . It is favorable for gas to accumulate and preserve in gas reservoirs. It is one of the important cause that a lot of gas reservoirs have been found in Volcanic rock of K1yc in Xujiaweizi depression.This indicates that the method is practical to evaluate comprehensively and quantitatively destroy degree of faults to mudstone caprock.