石油与天然气地质 ›› 2024, Vol. 45 ›› Issue (6): 1577-1589.doi: 10.11743/ogg20240606
牛小兵1,2(), 张辉1,3, 王怀厂1,3, 虎建玲1,3, 吴陈君4, 赵伟波1,3(), 潘博1,3
收稿日期:
2024-09-15
修回日期:
2024-10-20
出版日期:
2024-12-30
发布日期:
2024-12-31
通讯作者:
赵伟波
E-mail:nxb_cq@petrochina.com.cn;zhaowb_cq@petrochina.com.cn
第一作者简介:
牛小兵(1978—),男,教授级高级工程师,油气勘探管理与科研。E-mail:nxb_cq@petrochina.com.cn。
基金项目:
Xiaobing NIU1,2(), Hui ZHANG1,3, Huaichang WANG1,3, Jianling HU1,3, Chenjun WU4, Weibo ZHAO1,3(), Bo PAN1,3
Received:
2024-09-15
Revised:
2024-10-20
Online:
2024-12-30
Published:
2024-12-31
Contact:
Weibo ZHAO
E-mail:nxb_cq@petrochina.com.cn;zhaowb_cq@petrochina.com.cn
摘要:
鄂尔多斯盆地石炭系本溪组8#煤储层厚度大、分布范围广、发育稳定,是该区深层煤岩气有利勘探层段。通过对盆地中、东部重点井煤岩样品开展宏观煤岩特征、煤岩性质、储层特征以及煤岩含气性等方面的测试分析,研究了本溪组8#煤储层非均质性特征及成因。研究表明:①煤岩性质纵向发育存在明显的非均质性特征,下段主要发育半亮煤,灰分产率高,惰质组相对较发育,表明该段煤储层形成于偏氧化的成煤环境。中、上段发育光亮煤和半亮煤,灰分产率低,镜质组含量较高,反映了陆源输入较少的还原性成煤环境;②本溪组8#煤储层煤岩沉积环境变化控制了煤岩性质和储层发育特征。储层非均质性受到陆源矿物输入充填原生孔隙以及高含量镜质组生烃阶段产生大量气孔的双重影响。③上段由于沉积环境稳定,成煤条件好,灰分产率较低,煤储层孔隙和裂隙受碎屑矿物充填影响较小,煤岩储集物性更好,有利于气体的吸附和保存。中、上段镜质组含量高、生气能力强,具有更好的煤岩气物质条件,使得煤岩含气量更高,是鄂尔多斯盆地本溪组8#煤储层天然气勘探开发的有利层段。
中图分类号:
图4
鄂尔多斯盆地中、东部M172井本溪组8#煤储层煤岩样品显微组分特征显微照片a.半亮煤,丝质体和基质镜质体,埋深2 425.45 m;b.半亮煤,基质镜质体胶结粗粒体和矿物,埋深2 426.22 m;c.光亮煤,基质镜质体均质镜质体呈条带状分布,埋深2 427.27 m;d.光亮煤,基质镜质体均质镜质体呈条带状分布,埋深2 427.89 m;e.半亮煤,基质镜质体,埋深2 428.65 m;f.半亮煤,基质镜质体均质镜质体呈条带状分布,埋深2 429.29 m;g.半亮煤,基质镜质体胶结丝质体、半丝质体、粗粒体、微粒体、惰屑体和黏土矿物,埋深2 429.90 m;h.半亮煤,基质镜质体胶结丝质体、半丝质体、粗粒体、微粒体、惰屑体和黏土矿物,埋深2 430.55 m;i.半亮煤,基质镜质体胶结丝质体、粗粒体、微粒体和树脂体,埋深2 434.08 m"
表1
鄂尔多斯盆地中、东部M172井本溪组煤储层分形维数计算结果"
样品编号 | 埋深/m | 宏孔分形维数 | R2(宏孔) | 微孔分形维数 | R2(微孔) |
---|---|---|---|---|---|
M172-1 | 2 425.45 | 2.642 2 | 0.862 4 | 2.361 7 | 0.962 1 |
M172-2 | 2 426.22 | 2.704 9 | 0.865 9 | 2.301 0 | 0.9594 |
M172-3 | 2 427.27 | 2.630 7 | 0.869 7 | 2.307 9 | 0.954 3 |
M172-4 | 2 427.89 | 2.692 6 | 0.871 4 | 2.376 4 | 0.961 2 |
M172-5 | 2 428.65 | 2.671 6 | 0.896 9 | 2.317 8 | 0.956 1 |
M172-6 | 2 429.29 | 2.591 6 | 0.940 4 | 2.217 1 | 0.940 7 |
M172-7 | 2 429.90 | 2.752 4 | 0.851 4 | 2.223 2 | 0.978 6 |
M172-8 | 2 430.55 | 2.565 6 | 0.984 0 | 2.218 2 | 0.944 6 |
M172-9 | 2 431.01 | 2.667 2 | 0.964 6 | 2.272 9 | 0.957 0 |
M172-10 | 2 431.69 | 2.625 0 | 0.909 7 | 2.203 7 | 0.934 8 |
M172-11 | 2 432.60 | 2.691 2 | 0.860 5 | 2.215 3 | 0.963 0 |
M172-12 | 2 433.25 | 2.768 0 | 0.758 2 | 2.181 0 | 0.924 8 |
M172-13 | 2 434.08 | 2.733 1 | 0.757 5 | 2.321 8 | 0.952 4 |
M172-14 | 2 434.90 | 2.535 2 | 0.986 6 | 2.201 7 | 0.968 2 |
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