石油与天然气地质 ›› 2022, Vol. 43 ›› Issue (5): 1087-1101.doi: 10.11743/ogg20220507
施振生1(), 赵圣贤2, 赵群1, 孙莎莎1(), 周天琪1, 程峰1, 施少军3, 武瑾1
收稿日期:
2022-03-10
修回日期:
2022-07-19
出版日期:
2022-10-01
发布日期:
2022-09-02
通讯作者:
孙莎莎
E-mail:shizs69@petrochina.com.cn;sunss69@petrochina.com.cn
第一作者简介:
施振生(1976—),男,博士、高级工程师,细粒储层地质学。E?mail: 基金项目:
Zhensheng Shi1(), Shengxian Zhao2, Qun Zhao1, Shasha Sun1(), Tianqi Zhou1, Feng Cheng1, Shaojun Shi3, Jin Wu1
Received:
2022-03-10
Revised:
2022-07-19
Online:
2022-10-01
Published:
2022-09-02
Contact:
Shasha Sun
E-mail:shizs69@petrochina.com.cn;sunss69@petrochina.com.cn
摘要:
裂缝直接影响页岩储层特性和页岩气井单井测试产量。通过岩心和露头宏观裂缝描述、偏光显微镜和场发射扫描电镜微裂缝观察发现,川南地区五峰组-龙马溪组含气页岩宏观裂缝和微裂缝发育,可划分为顺层缝和非顺层缝。宏观裂缝中,顺层缝主要为页理缝和层间滑移缝,非顺层缝主要为斜交缝和垂直缝。微裂缝中,顺层缝主要为页理缝,非顺层主要为生烃增压缝、成岩收缩缝和溶蚀缝。含气页岩的裂缝以顺层缝为主,75 %的宏观裂缝和87 %的微裂缝均为顺层缝。裂缝密度和分布受埋深控制,埋深大于3 500 m地区裂缝集中发育于龙一1(1-3)小层,而埋深小于3 500 m地区裂缝集中发育于龙一1(1)小层。且随着埋深增加,宏观裂缝和微裂缝的密度均增大,部分井中埋深大于3 500 m含气页岩井宏观裂缝密度是其他埋深小于3 500 m同层含气页岩的10倍。页岩有机碳含量和层理类型也影响含气页岩的裂缝密度,高总有机碳含量的条带状粉砂型和砂-泥递变型水平层理页岩裂缝密度最大。裂缝发育有利于优质页岩段形成,埋深小于3 500 m地区优质页岩段主要发育于龙一1(1)小层;埋深大于3 500 m地区优质页岩段发育于龙一1(1-3)小层,部分井龙一2亚段底部由于成岩收缩缝发育,也成为优质页岩段。
中图分类号:
图2
川南地区五峰组-龙马溪组不同埋深含气页岩岩心和露头裂缝类型及特征a.顺层缝,页理缝,多数被有机质充填,少数方解石充填,长宁双河剖面,五峰组; b.顺层缝,页理缝,多数被有机质充填,少数被方解石充填,长宁双河剖面,五峰组; c.顺层缝,页理缝,多数被有机质充填,少数被方解石充填,长宁双河剖面,龙马溪组; d.顺层缝,层间滑移缝,方解石充填,阳107井,埋深1 209.05 m,龙一2亚段; e.顺层缝,层间滑移缝,方解石充填,含有大量黄铁矿,阳101H3-8井,埋深 3 744.27 m,龙一1(4)小层; f.斜交缝,方解石充填,阳105井,埋深1 690.10 m,龙一1(2)小层; g.斜交缝,方解石充填,含有大量黄铁矿,阳101H3-8井,埋深3 744.02 m,龙一2亚段; h.垂直缝,方解石充填,阳107井,埋深1 254.22 m,龙一1(2)小层(a—c为大薄片偏光显微镜照片;d—h为岩心照片。)"
图3
川南地区五峰组-龙马溪组不同埋深含气页岩微裂缝类型及特征常规薄片偏光显微镜照片a.顺层缝,硅质充填,阳101H3-8井,五峰组,埋深3 790.68 m; b.顺层缝,硅质充填,阳101H3-8井,五峰组,埋深3 788.69 m; c.顺层缝,硅质充填,阳101H3-8井,五峰组,埋深3 792.84 m; d.顺层缝,硅质充填,阳101H3-8井,龙一1(1)小层,埋深3 785.22 m; e.顺层缝,硅质充填,阳101H3-8井,龙一1(3)小层,埋深3 777.26 m; f.顺层缝,硅质充填,阳101H3-8井,龙一1(3)小层,埋深3 773.40 m; g.顺层缝,有机质充填,巫溪2井,龙一1(3)小层,埋深1 614.00 m; h.顺层缝,有机质、硅质充填,巫溪2井,龙一1(2)小层,埋深1 583.50 m; i.顺层缝,有机质充填,巫溪2井,龙一2亚段,埋深1 584.00 m; j.顺层缝,硅质充填,泸205井,龙一1(1)小层,埋深4 032.67 m; k.非顺层缝,树枝状,硅质充填,巫溪2井,龙一1(4)小层,埋深1 610.50 m; l.非顺层缝,网状,硅质充填,泸205井,龙一1(1)小层,埋深4 376.00 m"
图4
川南地区五峰组-龙马溪组不同埋深含气页岩顺层微裂缝类型及特征SEM照片a,b.页理缝,无充填,阳101H3-8井,五峰组,埋深3 789.30 m; c,d.页理缝,有机质充填,阳101H3-8井,龙一1(1)小层,埋深3 783.71 m; e.页理缝,充填少量围岩碎片,阳101H3-8井,龙一2亚段,埋深3 752.60 m; f.页理缝,无充填,阳101H3-8井,龙一1(4)小层,埋深3 765.29 m; g.页理缝,充填有机质和围岩碎片,阳101H3-8井,龙一1(2)小层,埋深3 781.95 m; h.页理缝,充填有机质,阳101H3-8井,龙一2亚段,埋深3 747.18 m; i.页理缝,充填有机质,有机质中含黄铁矿颗粒和围岩碎片,阳101H3-8井,龙一2亚段,埋深3 745.92 m; j.页理缝,有机质中含大量围岩碎片,阳101H3-8井,龙一1(3)小层,埋深3 773.40 m"
图5
川南地区五峰组-龙马溪组不同埋深含气页岩非顺层微裂缝类型及特征SEM照片a,b.生烃增压缝,裂缝沿着有机质与碎屑颗粒边缘分布,阳101H3-8井,龙一2亚段,埋深3 755.33 m; c.生烃增压缝,裂缝沿着有机质与碎屑颗粒边缘分布,充填少量围岩碎片,阳101H3-8井,龙一2亚段,埋深3 745.92 m; d.成岩收缩缝,分布于片状矿物内部,无充填,阳101H3-8井,龙一1(4)小层,埋深3 767.73 m; e.成岩收缩缝,分布于片状矿物内部,无充填,阳101H3-8井,龙一1(4)小层,埋深3 764.00 m; f.成岩收缩缝,分布于片状矿物内部,无充填,阳101H3-8井,龙一2亚段,埋深3 745.92 m; g.成岩收缩缝,分布于片状矿物内部,无充填,阳101H3-8井,五峰组,埋深3 793.80 m;h.成岩收缩缝,分布于片状矿物内部边缘,无充填,阳101H3-8井,五峰组,埋深3 788.69 m; i.成岩收缩缝,分布于片状矿物内部,无充填,阳101H3-8井,五峰组,埋深3 788.69 m; j.溶蚀缝,分布于碳酸盐矿物内部,充填少量方解石晶体,阳101H3-8井,龙一2亚段,埋深3 745.92 m;k.溶蚀缝,分布于碳酸盐矿物内部,无充填,阳101H3-8井,龙一2亚段,埋深3 755.33 m;l.溶蚀缝,分布于碳酸盐矿物边缘,无充填,阳101H3-8井,龙一1(3)小层,埋深3 777.26 m"
表2
川南地区五峰组-龙马溪组不同埋深含气页岩宏观裂缝密度对比"
层位 | 阳105井(压力系数1.2) | 威202井(压力系数1.4) | 阳101H3-8井(压力系数1.9) | 泸206井(压力系数2.2) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
深度/m | 裂缝密度/ (条·m-1) | TOC/% | 深度/m | 裂缝密度/ (条·m-1) | TOC/% | 深度/m | 裂缝密度/ (条·m-1) | TOC/% | 深度/m | 裂缝密度/ (条·m-1) | TOC/% | |
龙二段 | 1 022.8~1 098.0 | 0.47 | 0.7 | — | — | — | — | — | — | — | — | — |
龙一2亚段 | 1 098.0~1 166.8 | 0.53 | 1.1 | 2 537.2~2 560.0 | 0.9 | 2.8 | 3 744.0~3 762.2 | 3.1 | 2.2 | 4 014.5~4 017.1 | 1.7 | 1.8 |
龙一1(4)小层 | 1 166.8~1 180.2 | 0.15 | 2.5 | 2 560.0~2 567.5 | 1.1 | 3.5 | 3 762.2~3 770.5 | 2.6 | 2.7 | 4 017.1~4 026.0 | 3.6 | 2.2 |
龙一1(3)小层 | 1 180.2~1 194.0 | 0.14 | 3.5 | 2 567.5~2 570.6 | 1.2 | 3.9 | 3 770.5~3 778.4 | 3.3 | 4.4 | 4 026.0~4 033.8 | 4.4 | 3.2 |
龙一1(2)小层 | 1 194.0~1 200.2 | 0.54 | 4.1 | 2 570.6~2 572.6 | 1.6 | 5.3 | 3 778.4~3 781.9 | 2.9 | 4.9 | 4 033.8~4 038.0 | 5.1 | 4.3 |
龙一1(1)小层 | 1 200.2~1 201.5 | 0.77 | 6.5 | 2 572.6~2 574.0 | 5.4 | 6.1 | 3 781.9~3 784.6 | 5.9 | 5.1 | 4 038.0~4 040.8 | 7.8 | 4.8 |
五峰组 | 1 201.5~1 202.6 | 1.82 | 4.5 | 2 574.0~2 581.9 | 1.3 | 2.0 | 3 784.6~3 792.6 | 1.1 | 2.4 | 4 040.8~4 051.8 | 3.2 | 2.2 |
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