石油与天然气地质 ›› 2021, Vol. 42 ›› Issue (6): 1295-1306.doi: 10.11743/ogg20210605
王濡岳1,2,3(), 胡宗全1, 周彤1, 包汉勇4, 吴靖5, 杜伟1, 何建华6, 王鹏威1, 陈前1
收稿日期:
2021-07-26
出版日期:
2021-12-28
发布日期:
2021-12-16
作者简介:
王濡岳(1990-), 男, 博士、高级工程师, 非常规油气地质与油气勘探规划。E-mail: 基金资助:
Ruyue Wang1,2,3(), Zongquan Hu1, Tong Zhou1, Hanyong Bao4, Jing Wu5, Wei Du1, Jianhua He6, Pengwei Wang1, Qian Chen1
Received:
2021-07-26
Online:
2021-12-28
Published:
2021-12-16
摘要:
利用岩心、测井、扫描电镜和相关样品物性分析等手段,探讨了四川盆地周缘五峰组-龙马溪组页岩裂缝类型、发育特征、分布规律及其对页岩气富集与保存的影响。结果表明:①页岩裂缝发育受沉积、成岩、构造与压力演化等因素共同影响。低角度滑脱缝与层理缝充填程度低,对储层孔隙度和渗透率均有贡献;高角度裂缝和水平层间缝通常被充填,裂缝有效性较低。低角度裂缝对高角度裂缝穿层性的调节对页岩气的富集与保存具有重要意义。②页岩微裂缝以非构造成因为主,上部低有机质高粘土层段层理缝与大尺度层间微裂缝发育程度低,小尺度粘土粒间孔缝发育,宜采用"密切割"和"高砂比"等储层改造工艺技术以提高缝网控制储量。底部硅质页岩层理缝、层间微裂缝和刚性矿物粒缘缝发育程度高,裂缝力学性质薄弱,它们与密集发育的低角度及小尺度高角度裂缝共生形成了有利的天然缝网系统。③中-浅埋深下层理缝和层间微裂缝渗透率显著高于基质,利于储层改造与页岩气的渗流。深层条件下裂缝与基质渗透率均较低且大致相当,储层渗流能力与压裂改造效果是影响深层页岩气高效开发的重要因素。
中图分类号:
表1
四川盆地周缘五峰组-龙马溪组页岩裂缝主要类型及其成因"
类型 | 亚类 | 主要成因 |
构造裂缝 | 剪切裂缝 | 局部或区域构造应力作用下,泥页岩剪切/张性破裂形成,常与褶皱或断层伴生,裂缝以中高角度为主 |
张剪性裂缝 | ||
低角度滑脱裂缝 | 伸展或挤压构造作用下,沿层理或层间薄弱面滑动剪切形成 | |
高角度扭动性裂缝 | 压扭或张扭作用下,剪切裂缝沿缝面发生明显滑动位移形成 | |
非构造裂缝 | 层理缝 | 沉积过程中沉积物成分、结构的差异使力学性质薄弱的剥离线理广泛发育,易于剥离 |
层间缝 | 层间黄铁矿生长、页岩生排烃异常压力等作用下形成 | |
溶蚀缝 | 有机酸等地层流体对不稳定矿物溶蚀作用下形成 | |
成岩收缩缝 | 岩石干缩、脱水、矿物相变或热力收缩等作用下形成 | |
风化裂缝 | 风化、淋滤等作用下形成 |
图2
四川盆地JY1井五峰组-龙马溪组底部页岩裂缝发育特征 a.五峰组和龙马溪组下部成像测井图,页理与层间缝发育;b.低TOC层段高角度构造缝,纵向延伸长,埋深2 330.9 m,S1l1,岩心照片;c.中TOC层段高角度构造缝,裂缝长度与开度有所减小,埋深2 342.0 m,S1l1,岩心照片;d.层理缝,未充填,埋深2 403.5 m,S1l1,岩心照片;e.层间滑脱缝,见擦痕,埋深2 407.9 m,S1l1,岩心照片;f.层间超压裂缝与黄铁矿纹层,埋深2 404.8 m,S1l1,岩心照片;g.层理缝与斑脱岩夹层,易于剥离,埋深2 412.3 m,03w,岩心照片;h.高角度构造缝与水平方解石充填缝,埋深2 414.0 m,O3w,岩心照片;i.高角度构造缝与水平方解石充填缝发育,见两条扭动性裂缝,缝面见擦痕,埋深2 414.5 m,O3w,岩心照片;j.不同类型裂缝纵向发育模式"
图3
四川盆地周缘五峰组-龙马溪组层间微裂缝扫描电镜下发育特征 a.层间缝发育程度低,S1l1上部,埋深2 337.9 m,JY1井;b.层间缝,有机质充填,S1l1下部,埋深3 812.4 m,DY5井;c.层间缝,有机质充填,O3w,埋深2 821.1 m,JY8井;d.层间缝,有机质半充填,S1l1上部,埋深2 330.5 m,JY1井;e.层间缝,有机质半充填,S1l1中下部,埋深2 385.4 m,JY1井;f.层间缝,有机质充填,S1l1下部,埋深3 856.6 m,YY1井;g.图f局部放大,有机质边缘见收缩缝;h.层间缝,粒缘缝沟通形成,重晶石充填,S1l1上部,埋深3 819.4 m,YY1井;i.层间缝,粒缘缝沟通形成,重晶石半充填,O3w,埋深3 870.8 m,YY1井"
图4
四川盆地周缘五峰组-龙马溪组粒缘(间)缝与粒内缝扫描电镜下发育特征 a.粘土矿物粒间缝,未充填为主,S1l1上部,埋深3 800.6 m,YY1井;b.矿物粒缘(间)缝,O3w,埋深2 593.1 m,JY4井;c.粘土矿物粒间缝,有机质充填为主,S1l1下部,埋深2 407.4 m,JY1井;d.莓状黄铁矿及粘土矿物粒间孔缝,S1l1上部,埋深3 784.2 m,YY1井;e.莓状黄铁矿及粘土矿物粒间孔缝,有机质充填,O3w,埋深2 414.9 m,JY1井;f.方解石粒缘缝,S1l1中部,埋深2 373.6 m,JY1井;g.碳酸盐矿物粒缘、粒内孔缝发育,有机质充填为主,O3w,埋深3 865.6 m,YY1井;h.碳酸盐颗粒内孔缝,有机质充填,S1l1下部,埋深3 587.3 m,WY1井;i.长石溶蚀缝,粘土矿物与有机质充填,S1l1下部,埋深2 049.0 m,DY1井"
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