石油与天然气地质 ›› 2021, Vol. 42 ›› Issue (1): 66-75.doi: 10.11743/ogg20210106
王红岩1,2(), 施振生1,2, 孙莎莎1,2, 张磊夫1,2
收稿日期:
2020-04-24
出版日期:
2021-02-28
发布日期:
2021-02-07
作者简介:
王红岩(1971-), 男, 博士、教授级高级工程师, 非常规油气地质。E-mail: 基金资助:
Hongyan Wang1,2(), Zhensheng Shi1,2, Shasha Sun1,2, Leifu Zhang1,2
Received:
2020-04-24
Online:
2021-02-28
Published:
2021-02-07
摘要:
深层页岩储层是页岩气勘探开发的重要接替领域。针对四川盆地及周缘龙马溪组一段深层页岩,系统开展了X-衍射全岩(XRD)、总有机碳(TOC)、大薄片及氩离子抛光大片成像研究。结果表明,相对于浅层页岩,深层页岩储层具有高硅质和低TOC含量、低粉砂纹层含量、高孔隙度和更有效的孔隙网络特征。由浅层至深层,页岩硅质含量由30%增至62%。相应地,碳酸盐含量由32%降至14.3%,粘土矿物含量由33%降至7.8%,TOC含量由7.1%降至4.25%。深层页岩储层发育条带状粉砂纹理,与浅层页岩相比,其粉砂纹层含量减少、单层厚度减薄。黑色页岩发育有机孔、无机孔和微裂缝,由浅层至深层,页岩总面孔率由1.6%增至10.8%,有机孔和无机孔均明显增加,且微裂缝占比由1%增至12%。深层页岩储层有机孔、无机孔和微裂缝相互连通,形成有效的孔隙网络。深层高硅质含量、高孔隙度和更有效的孔隙网络与生物成因硅有关,低TOC含量与远离物源有关,低粉砂纹层含量与水深较大有关。生物成因硅在成岩过程中可形成大量有机孔、无机孔和微裂缝,且其可有效保存孔隙。有机质的生成受营养物质供给影响,远离物源区营养供给较少。粉砂纹层主要由碳酸盐矿物组成,深层不利于碳酸盐的形成。
中图分类号:
表1
四川盆地及周缘志留系龙马溪组取样点及分析测试项目"
取样位置 | 层位 | 深度/m | TOC/% | XRD测试矿物含量/% | |||
粘土矿物 | 石英 | 长石 | 碳酸盐 | ||||
足202井 | 龙一1(1) | 3 890.75 | 4.13 | 17.4 | 66.7 | 5.1 | 7.0 |
足203井 | 龙一1(1) | 4 101.50 | 4.76 | 11.7 | 70.1 | 3.7 | 11.3 |
威201井 | 龙一1(1) | 1 541.78 | 5.16 | 14.3 | 66.2 | 2.7 | 14.5 |
威201井 | 龙一1(1) | 1 542.60 | 8.20 | 12.4 | 68.1 | 3.3 | 11.5 |
威202井 | 龙一1(1) | 2 571.28 | 7.10 | 14.4 | 71.2 | 1.6 | 11.7 |
自202井 | 龙一1(1) | 3 647.95 | 4.04 | 17.1 | 45.8 | 11.2 | 17.9 |
荣203井 | 龙一1(1) | 4 344.56 | 1.44 | 26.6 | 47.9 | 4.5 | 18.5 |
黄202井 | 龙一1(1) | 4 080.64 | 3.66 | 11.4 | 65.7 | 2.4 | 17.9 |
泸201井 | 龙一1(1) | 3 615.70 | 4.25 | 6.5 | 69.9 | 2.4 | 19.4 |
宁201井 | 龙一1(1) | 2 519.60 | 7.08 | 15.0 | 44.0 | 2.0 | 36.0 |
宁203井 | 龙一1(1) | 2 392.55 | 4.72 | 5.0 | 67.0 | 4.8 | 21.5 |
宁209井 | 龙一1(1) | 3 168.97 | 5.41 | 23.8 | 50.2 | 2.6 | 23.4 |
宁210井 | 龙一1(1) | 2 232.49 | 4.69 | 16.5 | 55.1 | 0.0 | 28.4 |
YS106井 | 龙一1(1) | 1 432.40 | 5.15 | — | — | — | — |
YS112井 | 龙一1(1) | 2 455.30 | 5.25 | 23.6 | 36.3 | 10.9 | 25.0 |
YS112井 | 龙一1(1) | 2 456.61 | 8.90 | 8.5 | 12.2 | 3.6 | 60.9 |
宝1井 | 龙一1(1) | 1 273.50 | — | 33.0 | 30.0 | 5.0 | 32.0 |
长宁双河剖面 | 龙一1(1) | — | 9.87 | 16.0 | 71.0 | 3.0 | 10.0 |
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