岩性油气藏 ›› 2024, Vol. 36 ›› Issue (2): 5264.doi: 10.12108/yxyqc.20240206
• 地质勘探 • 上一篇
白雪峰1,2,3, 李军辉2,3, 张大智2,3, 王有智2,3, 卢双舫1, 隋立伟2,3, 王继平2,3, 董忠良2,3
BAI Xuefeng1,2,3, LI Junhui2,3, ZHANG Dazhi2,3, WANG Youzhi2,3, LU Shuangfang1, SUI Liwei2,3, WANG Jiping2,3, DONG Zhongliang2,3
摘要: 基于钻井岩心的地球化学及其他实验分析结果,结合生产测试资料,对四川盆地仪陇—平昌地区侏罗系凉高山组页岩油地质特征及富集条件进行研究,并划分了勘探有利区。研究结果表明:①仪陇—平昌地区凉高山组为早侏罗世第3次湖盆扩张期的沉积产物,整体经历了凉下段滨湖—浅湖、凉上段中—下部深湖—半深湖及浅湖、凉上段上部三角洲前缘和浅湖的沉积环境变化。②研究区凉高山组页岩可分为长英质页岩、钙质页岩、黏土质页岩等3种;页岩有机质丰度高,TOC值为0.50%~3.39%,平均值为1.30%,有机质类型以Ⅱ1和Ⅱ2型为主,热演化程度高,镜质体反射率(Ro)为1.00%~1.90%,处于高—过成熟阶段。③凉高山组页岩物性较好,孔隙度为0.48%~7.17%,平均为3.61%,发育无机成因孔、有机孔和构造缝等储集空间类型;含油性较好,以轻质组分为主,整体呈零散状、点状分布,局部呈团块状富集;凉上段下部富有机质页岩更发育,是目前勘探的重点层位。④凉高山组页岩油气的富集受控于前陆盆地过渡期的弱沉降环境、大面积分布的深湖相沉积、较高的热演化程度以及普遍发育的微裂缝。中南部为页岩油气潜力区,页岩储层厚度一般大于15m,TOC值大于1.50%,孔隙度大于4.00%,Ro大于1.30%;凉高山组页岩油资源量为26.75×108t、页岩气资源量为1.72×1012m3,有望成为四川盆地石油产量增加的主力层系。
中图分类号:
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