石油与天然气地质 ›› 2024, Vol. 45 ›› Issue (2): 420-439.doi: 10.11743/ogg20240209
何骁1(), 郑马嘉2, 刘勇1, 赵群3, 石学文4, 姜振学5(), 吴伟4, 伍亚2, 宁诗坦5, 唐相路5, 刘达东5
收稿日期:
2023-10-28
修回日期:
2024-03-18
出版日期:
2024-04-30
发布日期:
2024-04-30
通讯作者:
姜振学
E-mail:hexiao@petrochina.com.cn;jiangzx@cup.edu.cn
第一作者简介:
何骁(1969—),男,博士、高级工程师,常规和非常规油气开发研究及技术管理。E-mail: hexiao@petrochina.com.cn。
基金项目:
Xiao HE1(), Maja ZHENG2, Yong LIU1, Qun ZHAO3, Xuewen Shi4, Zhenxue Jiang5(), Wei WU4, Ya WU2, Shitan NING5, Xianglu TANG5, Dadong LIU5
Received:
2023-10-28
Revised:
2024-03-18
Online:
2024-04-30
Published:
2024-04-30
Contact:
Zhenxue Jiang
E-mail:hexiao@petrochina.com.cn;jiangzx@cup.edu.cn
摘要:
四川盆地寒武系筇竹寺组是继五峰组-龙马溪组后页岩气勘探开发的重要接替层位,目前在德阳-安岳裂陷槽中心和槽缘部署的Z201井和WY1井页岩气勘探取得良好效果,但裂陷槽内筇竹寺组页岩储层发育特征仍不清楚。以槽内中心Z201井和槽缘WY1井为重点,结合其他页岩气勘探开发资料,系统分析了研究区筇竹寺组页岩各小层矿物特征、有机地化特征、储层及储集空间特征、含气性特征。研究结果表明:①筇竹寺组可划分为8个小层,页岩整体以脆性矿物为主,总有机碳含量(TOC)普遍大于1 %,为优质烃源岩,且槽内TOC高于槽缘,具备良好的生气条件。②筇竹寺组页岩有机孔与无机孔均发育,槽内孔隙发育更好,具有极高的含气量。1,3,5和7小层黑色页岩储层品质较好,5小层储层品质最优。③德阳-安岳裂陷槽控制了筇竹寺组页岩储层发育,槽内Z201井钻遇的筇竹寺组页岩储层优于槽缘WY1井。④乐山-龙女寺古隆起控制筇竹寺组页岩有机质演化程度,古隆起内筇竹寺组有机质热演化成熟度普遍低于古隆起外,隆起区适中的热演化程度具备大规模富气的条件。筇竹寺组页岩储层各项条件较好,是未来页岩气勘探开发的主要接替区域。
中图分类号:
表2
四川盆地筇竹寺组页岩Ro(拉曼)值及干酪根碳同位素统计"
样品位置 | 井名 | 层位 | 埋深/m | Ro(拉曼)/% | δ13C(干酪根)/‰ | ||
---|---|---|---|---|---|---|---|
范 围 | 平均值 | 范围 | 平均值 | ||||
槽内 | Z201 | 筇竹寺组 | 4 893.29 | 3.29 ~ 3.44 | 3.36 | -29.93 ~ -28.61 | -29.41 |
GS17 | 筇竹寺组 | 4 976.86 | 3.54 ~ 3.60 | 3.57 | -31.05 ~ -28.23 | -30.04 | |
N206 | 筇竹寺组 | 1 863.57 | 3.71 ~ 3.75 | 3.74 | -31.42 ~ -29.86 | -31.14 | |
N208 | 筇竹寺组 | 3 237.97 | 3.72 ~ 3.81 | 3.78 | -30.12 ~ -27.59 | -29.55 | |
槽外 | W201 | 筇竹寺组 | 2 822.42 | 3.02 ~ 3.33 | 3.22 | -31.86 ~ -27.74 | -30.23 |
JS1 | 筇竹寺组 | 3 280.52 | 3.41 ~ 3.50 | 3.46 | -31.00 ~ -29.30 | -30.58 | |
PT1 | 筇竹寺组 | 3 280.52 | 3.38 ~ 3.52 | 3.44 | -34.08 ~ -30.64 | -32.33 |
图6
四川盆地筇竹寺组页岩储层孔隙类型镜下特征照片及筇竹寺组、龙马溪组各小层不同孔隙类型占比纵向分布特征a. Z201井,有机孔发育,槽内,埋深4 458.74 m,SEM;b. WY1井,有机孔较发育,槽缘,埋深4 296.97 m,SEM;c. W201井,有机孔不发育,槽外,SEM;d. Z201井,无机孔发育,埋深4 458.74 m,槽内,SEM;e. WY1井,无机孔发育,槽缘,埋深4 296.97 m,SEM;f. W201井,黏土矿物粒间孔,槽外,埋深2 771.30 m, SEM;g. Z201井,筇竹寺组,槽内;h. W201井,筇竹寺组,槽外;i. Y101H井,龙马溪组"
表5
四川盆地Z201井和WY1井筇竹寺组页岩储层参数(TOC≥2 %)"
井名 | 地层 | 小层编号 | 起始 深度/m | 终止 深度/m | 地层 厚度/m | 储层 厚度/m | 有效孔隙度/% | 含水 饱和度/% | 黏土 矿物 含量/% | 碳酸盐矿物 含量/% | 石英 含量/% | 脆性 指数/% | TOC/% | 吸附气含量/(m3/t) | 游离气含量/(m3/t) | 总含 气量/(m3/t) | 储层类型 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Z201 | 筇二段 | 7 | 4 460.9 | 4 487 | 26.1 | 2.4 | 4.8 | 32.2 | 24.3 | 0 | 63.0 | 69.0 | 2.1 | 1.5 | 5.7 | 7.2 | Ⅱ类 |
筇一2亚段 | 5 | 4 563.2 | 4 620.9 | 57.7 | 40.6 | 4.8 | 25.4 | 21.3 | 1.4 | 64.0 | 71.2 | 2.8 | 1.7 | 6.3 | 8.0 | Ⅰ类 | |
筇一1亚段 | 3 | 4 740.4 | 4 809.3 | 68.9 | 15.0 | 3.9 | 25.3 | 13.6 | 12.5 | 63.1 | 80.4 | 2.7 | 1.7 | 5.0 | 6.6 | Ⅰ类 | |
1 | 4 846.9 | 4 868.8 | 21.9 | 4.1 | 3.9 | 24.7 | 9.6 | 12.4 | 67.0 | 83.8 | 3.2 | 1.9 | 5.0 | 6.8 | Ⅰ类 | ||
WY1 | 筇二段 | 7 | 4 219.1 | 4 243.2 | 24.1 | 0.6 | 4.0 | 37.8 | 34.9 | 6.2 | 45.4 | 57.0 | 2.1 | 1.4 | 3.7 | 5.2 | II类 |
筇一2亚段 | 5 | 4 314.9 | 4 364.7 | 49.8 | 18.0 | 4.4 | 22.6 | 34.2 | 3.2 | 48.1 | 63.1 | 2.5 | 1.6 | 6.4 | 8.0 | Ⅰ+Ⅱ类 | |
筇一1亚段 | 3 | 4 403.9 | 4 448.7 | 44.8 | 23.0 | 3.7 | 19.3 | 35.8 | 2.2 | 47.4 | 66.2 | 2.8 | 1.7 | 5.8 | 7.5 | Ⅰ+Ⅱ类 | |
1 | 4 463.5 | 4 477.5 | 14.0 | 0 | — | — | — | — | — | — | — | — | — | — | Ⅲ类 |
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