石油与天然气地质 ›› 2022, Vol. 43 ›› Issue (1): 149-160.doi: 10.11743/ogg20220112
王林生1(), 叶义平1, 覃建华1, 高阳1, 邓远1,2(), 李映艳1, 肖佃师3
收稿日期:
2021-08-24
修回日期:
2021-11-25
出版日期:
2022-02-01
发布日期:
2022-01-28
通讯作者:
邓远
E-mail:bkqwls@petrochina.com.cn;dengyuan_geo@163.com
第一作者简介:
王林生(1978—),男,高级工程师,油气田开发。E?mail: 基金项目:
Linsheng Wang1(), Yiping Ye1, Jianhua Qin1, Yang Gao1, Yuan Deng1,2(), Yingyan Li1, Dianshi Xiao3
Received:
2021-08-24
Revised:
2021-11-25
Online:
2022-02-01
Published:
2022-01-28
Contact:
Yuan Deng
E-mail:bkqwls@petrochina.com.cn;dengyuan_geo@163.com
摘要:
针对准噶尔盆地吉木萨尔凹陷二叠系芦草沟组页岩油储层类型多样和油层甜点预测难度大的问题,开展页岩油孔隙发育影响机制及含油性分级评价研究。在岩心观察的基础上,应用扫描电镜、压汞和核磁共振等手段,研究吉木萨尔凹陷二叠系芦草沟组页岩油储层的微观孔隙结构,揭示孔隙发育及含油性影响机制,建立油层分类评价标准。结果表明:①芦草沟组发育粒间孔型、粒间-溶蚀-晶间孔型、溶蚀孔型、溶蚀-晶间孔型和晶间孔型5类储层,其中粒间孔型和溶蚀孔型物性及可动性最好,晶间孔型最差。②较高的偏粗组分数量、适中的白云石含量和低胶结物含量共同决定优质储层形成,优质储层分布受近物源、高能环境及古凹的控制。③源-储互层或一体型配置模式含油性好于邻源厚层型,15 nm和70 nm为芦草沟组能否含油及含油性变好的孔喉半径界限。④以孔喉结构与含油性关系为指导,划分出Ⅰ类油层、Ⅱ类油层和Ⅲ类油层。芦草沟组一段二亚段优质储层发育,源-储配置佳,油层甜点分布规模大。研究成果为芦草沟组页岩油油层分类评价及甜点预测提供了地质依据。
中图分类号:
表1
准噶尔盆地吉木萨尔凹陷二叠系芦草沟组页岩油储层样品信息"
样品编号 | 含油级别 | 薄片鉴定岩性 | 孔隙度/% | 渗透率/(10-3 μm2) | 孔喉组合类型 | 全岩矿物含量/ % | 可动饱和度/ % | ||||
---|---|---|---|---|---|---|---|---|---|---|---|
石英 | 长石 | 白云石 | 方解石 | 粘土 | |||||||
5?H | 荧光 | 泥岩 | 5.5 | 0.577 0 | E | 28.6 | 53.5 | 1.5 | 1.2 | 15.2 | 20.50 |
13?H | 荧光 | 白云质泥岩 | 6.9 | 0.055 9 | E | — | — | — | — | — | 13.83 |
17?H | 荧光 | 白云质泥岩 | 6.1 | 0.009 4 | E | 20.6 | 32.7 | 40.8 | 0 | 5.7 | 17.54 |
3 | 荧光 | 泥晶白云岩 | 4.3 | 0.003 0 | E | 29.3 | 43.3 | 12.9 | 4.7 | 7.6 | 44.13 |
J43?95 | 油迹 | 灰质粉砂岩 | 5.6 | 0.008 5 | D | 9.4 | 49.7 | 1.5 | 36.3 | 3.1 | 22.69 |
13 | 油迹 | 含灰粉砂岩 | 5.1 | 0.011 9 | D | 14.1 | 53.2 | 6.5 | 21.2 | 3.3 | 36.89 |
10 | 油斑 | 泥岩 | 11.9 | 0.027 7 | D | 40.2 | 35.7 | 11.1 | 0 | 13.0 | 38.60 |
24 | 油斑 | 泥质粉砂岩 | 8.9 | 0.139 5 | D | 16.3 | 51.1 | 7.8 | 10.1 | 12.3 | 42.56 |
3?H | 油斑 | 粉砂质泥岩 | 14.7 | 0.061 8 | C | 37.5 | 48.0 | 2.6 | 3.8 | 5.2 | 37.90 |
39 | 油浸 | 粉砂质白云岩 | 14.9 | 0.046 9 | B | 6.4 | 5.3 | 88.3 | 0 | 0 | 54.80 |
2?H | 油浸 | 细粒粉砂岩 | 14.3 | 0.083 3 | A | 28.5 | 67.0 | 0 | 0 | 3.7 | 59.89 |
15?H | 油浸 | 含灰泥质粉砂岩 | 9.4 | 0.019 7 | B | 21.0 | 56.7 | 0 | 18.7 | 3.1 | 43.24 |
9?H | 富含油 | 云屑砂岩 | 14.0 | 0.289 0 | A | 12.0 | 74.2 | 2.4 | 9.8 | 1.6 | 70.20 |
32 | 富含油 | 细粒粉砂岩 | 15.6 | 0.107 5 | C | 22.1 | 59.2 | 5.1 | 0 | 6.4 | 69.80 |
10?H | 富含油 | 云屑砂岩 | 13.7 | 0.275 0 | A | 12.0 | 73.2 | 2.4 | 9.8 | 1.6 | 69.15 |
12?H | 富含油 | 砂屑云岩 | 14.6 | 1.320 0 | A | 4.5 | 29.2 | 40.4 | 24.2 | 1.7 | 77.32 |
图2
准噶尔盆地吉木萨尔凹陷二叠系芦草沟组页岩油储层孔隙扫描电镜特征a.残留粒间孔和粒内溶蚀孔发育,12-H号样品,砂屑白云石,埋深3 317.50 m,J10016井;b.残留粒间孔、粒间溶蚀孔和粒内溶蚀孔并存,39号样品,粉砂质白云岩,埋深2 715.15 m,Ji31井;c.溶蚀孔和粘土晶间孔,30-H号样品,云质粉砂岩,埋深3 469.90 m,J10022井;d.溶蚀孔和晶间孔,9号样品,粉砂质泥岩,埋深2 844.56 m,Ji37井;e.长石粒内溶蚀孔及方解石交代,J43-95号样品,灰质粉砂岩,埋深2 967.59 m,Ji43井;f.粘土晶间孔,30-H号样品,云质粉砂岩,埋深3 469.90 m,J10022井;g.白云石晶间孔,11号样品,泥晶白云岩,埋深2 856.41 m,Ji37井;h.有机孔和粒内溶蚀孔,3-H号样品,粉砂质泥岩,埋深3 296.40 m,J10016井;i.微裂缝和粒内溶蚀孔,24号样品,泥质粉砂岩,埋深3 756.38 m,Ji251井"
图4
准噶尔盆地吉木萨尔凹陷二叠系芦草沟组页岩油储层T2分布a.3号样品,晶间孔型组合,泥晶白云岩,埋深3 044.97 m,Ji176井;b.10号样品,溶蚀-晶间孔组合,页岩,埋深2 847.16 m,Ji37井;c.39号样品,粒间-溶蚀-晶间孔型组合,粉砂质白云岩,埋深2 715.15 m,Ji31井;d.30-H号样品,溶蚀孔型组合,云质粉砂岩,埋深3 469.90 m,J10022井;e.5-H号样品,晶间孔型,泥岩,埋深3 301.40 m,J10016井;f.J43-95号样品,溶蚀-晶间孔型,灰质粉砂岩,埋深2 967.59 m,Ji43井;g.15-H号样品,粒间-溶蚀-晶间孔型,含灰质粉砂岩,埋深3 452.20 m,J10016井;h.9-H号样品,粒间孔型,云屑粉砂岩埋深3 315.20 m,J10016井;i.12-H号样品,粒间孔型,砂屑白云岩,埋深3 317.50 m,J10016井"
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