石油与天然气地质 ›› 2021, Vol. 42 ›› Issue (5): 1078-1088.doi: 10.11743/ogg20210506
收稿日期:
2020-06-08
出版日期:
2021-10-28
发布日期:
2021-10-26
作者简介:
范柏江(1983-), 男, 博士、副教授, 常规及非常规油气成藏机理。E-mail: 基金资助:
Bojiang Fan1(), Yue Jin1, Liang Shi1, Yating Li1, Weichang Chen2
Received:
2020-06-08
Online:
2021-10-28
Published:
2021-10-26
摘要:
鄂尔多斯盆地中部延长组7段页岩为浅湖-半深湖相沉积,页岩厚度薄且交互发育砂质纹层甚至薄砂层。在压裂改造层面上,该地区页岩由于砂质含量高似乎是更理想的开发目标。但是,尚没有对该地区的页岩油勘探目标进行过剖析与对比。为了探索浅湖-半深湖相的页岩油勘探目标,基于地球化学测试与分析,开展了两类岩性的生、排烃能力对比,综合判断页岩油资源的勘探潜力。研究表明,页岩的有机质丰度高于砂质纹层页岩;页岩主要由偏腐泥型的有机质构成,砂质纹层页岩由混合型有机质构成;页岩和砂质纹层页岩均处于低-中等成熟的热演化阶段;砂质纹层页岩的生烃能力弱于页岩;页岩与砂质纹层页岩均能有效排烃;砂质纹层页岩、页岩的页岩油含量分别为7.22和9.42 mg/g;砂质纹层页岩与页岩的油饱和度指数相当,且两者都具有可动用性;页岩和砂质纹层页岩均具有页岩油勘探潜力。
中图分类号:
图2
鄂尔多斯盆地中部长7段页岩岩心特征 a.黑色页岩, 页岩断面光滑且有凹凸状印模, G314井, 埋深1 810.40 m, 岩心照片, b.黑色页岩, 页岩断面光滑且含有大量鱼鳞, Q100井, 埋深1 383.07 m, 岩心照片; c.砂质纹层页岩, D199井, 埋深1 365.19 m, 岩心照片; d.砂质纹层页岩, YCCV1245井, 埋深1 564.10 m, 岩心照片; e.灰色砂质纹层页岩, YCCV1252井, 埋深1 388.40 m, 岩心照片; f.黑色页岩, 可见孢子体, YCCV1245井, 埋深1 555.60 m, 单偏光铸体薄片; g.黑色以及深灰色页岩, S3114井, 埋深1 141.07~1 147.73 m, 岩心照片; h.砂质纹层页岩渗油, W336井, 埋深1 955.62 m, 岩心照片; i.砂质纹层页岩, 粗粒组分与细粒组分交互发育, YCYV1112井, 埋深1 357.96 m, 单偏光铸体薄片; j.含砂质纹层页岩, D214井, 埋深1 175.21 m, 单偏光铸体薄片; k.砂质纹层页岩, 可见微裂缝发育, YCYV1113井, 埋深2 487.30 m, 单偏光铸体薄片; l.砂质纹层页岩, 可见裂缝被沥青质充填, YCCY1220井, 埋深1 117.50 m, 荧光薄片"
表1
鄂尔多斯盆地中部长7段不同页岩物性对比"
样号 | 井号 | 取心样号或深度 | 岩性 | 实测孔隙度/% | 渗透率/(10-3 μm2) | 测量方向 |
1 | H36 | 2-52/54 | 纯页岩 | 1.69 | 0.076 | 垂直层理方向 |
2 | H36 | 2-52/54 | 纯页岩 | 3.54 | 0.091 | 垂直层理方向 |
3 | H36 | 2-34/54 | 砂质纹层页岩 | 3.36 | 0.036 | 平行层理方向 |
4 | H36 | 2-34/54 | 砂质纹层页岩 | 3.50 | 0.491 | 垂直层理方向 |
5 | C100 | 814.19 m | 砂质纹层页岩 | 3.74 | 0.133 | 垂直层理方向 |
6 | H36 | 2-45/54 | 砂质纹层页岩 | 3.96 | 0.603 | 平行层理方向 |
7 | C100 | 814.19 m | 砂质纹层页岩 | 4.14 | - | 平行层理方向 |
8 | H36 | 2-45/54 | 砂质纹层页岩 | 5.48 | 0.255 | 垂直层理方向 |
9 | X54 | 1 053.31 m | 砂质纹层 | 7.09 | 0.923 | 垂直层理方向 |
10 | X54 | 1 053.31 m | 砂质纹层 | 7.14 | 3.583 | 平行层理方向 |
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