页岩气现场解析气量影响因素探讨——以潍北凹陷昌页参1井为例

Study on Influence Factors of Shale Gas Scene Analytical Gas Quantity——Take Changye Canyi Well as an Example

潍北凹陷是昌潍坳陷的次一级凹陷盆地,也是传统油气开采区,潍北凹陷孔店组二段沉积了较厚的暗色泥岩、泥页岩、油页岩,多为良好的烃源岩,也是潍北凹陷内页岩气的主要生、储层位。通过分析昌页参1井现场解析实验数据,探讨了潍北凹陷孔店组二段地层损失气量、损失时间、样品深度、样品岩性等与解析气量的对应关系。分析现场解析实验数据发现,样品的损失气量大于解析气量,两者的变化趋势基本一致;深度相近、岩性相同时,解析气量随着损失时间的增长而减小,深度相近时,泥岩解析气量大于粉砂质泥岩;岩性相同时,解析气量随深度的增加而增加,增速随深度的增加而减小。

Weibei depression is a secondary depression basin in Changwei depression.It is also a traditional oil and gas exploitation area.Thick dark mudstone,shale and oil shale are sedimented in the second section of Kongdian formation in Weibei depression.They are good hydrocarbon source rocks and raw shale gas reservoir in Weibei depression.In this paper,through analyzing the scene analytical experiment data of Ca-nyi well in Changyel,the corresponding relation of the loss of gas,loss of time,sample depth,lithology and the analysis of gas in the second section of Kongdian formation in Weibei depression have been studied. As showed by the analysis of the scene analytical experiment data,it is indicated that the loss of gas is greater than the analytical gas.The variation trend is uniform,that is when the depth is similar and the li-thology is the same,analytical gas will increase accompanying with the decrease of the loss of time;when the depth is similar,the analytical gas of the mudstone is greater than the silty mudstone;when the lithol-ogy is the same,the analytical gas will increase accompanying with the growth of the depth,and the growth rate will decrease accompanying with the growth of the depth.