陕北斜坡上古生界构造裂缝及其天然气成藏意义

被引:14
作者
万永平 [1 ,2 ]
王根厚 [1 ]
归榕 [1 ]
李春霞 [2 ]
银晓 [2 ]
周进松 [2 ]
机构
[1] 中国地质大学地球科学与资源学院
[2] 陕西延长石油(集团)有限责任公司研究院
关键词
陕北斜坡; 上古生界; 裂缝; 运移通道; 天然气; 成藏;
D O I
10.13278/j.cnki.jjuese.2013.01.013
中图分类号
P618.13 [石油、天然气];
学科分类号
0709 ; 081803 ;
摘要
鄂尔多斯盆地陕北斜坡上古生界气藏发育多套储层,中上部储层(石盒子组及石千峰组)与烃源岩(山西组下部及本溪组煤系地层)之间发育280~350m致密砂泥岩隔层,由于盆地断裂构造不发育,天然气运移通道及成藏模式成为该区气藏研究的焦点。在岩心观察、微裂缝研究、测井解释、岩心孔隙度-渗透率实验研究的基础上,结合成岩作用及裂缝形成时间分析,对研究区上古生界隔层裂缝分布与中上部气藏之间的匹配关系进行了系统研究。结果表明:研究区上古生界主要发育剪性裂缝,裂缝形成于晚侏罗世早白垩世,裂缝的形成在改善储层渗透性的同时,为天然气的纵向运移提供了必要的运移通道。综合分析认为:研究区上古生界隔层裂缝与中上部气藏在时空上具有良好的耦合关系,形成了基于裂缝运移及砂岩储存的石盒子组与石千峰组"岩性-裂缝型"气藏。
引用
收藏
页码:28 / 38
页数:11
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