石油与天然气地质 ›› 2022, Vol. 43 ›› Issue (3): 658-669.doi: 10.11743/ogg20220314
孙光远1(), 王哲麟2,3, 刘培刚3,4(), 张志强3
收稿日期:
2021-12-02
修回日期:
2022-03-10
出版日期:
2022-06-01
发布日期:
2022-05-06
通讯作者:
刘培刚
E-mail:3130000936@zju.edu.cn;dongfangwy@upc.edu.cn
作者简介:
孙光远(1995—),男,硕士研究生,油气地质。E?mail: Guangyuan Sun1(), Zhelin Wang2,3, Peigang Liu3,4(), Zhiqiang Zhang3
Received:
2021-12-02
Revised:
2022-03-10
Online:
2022-06-01
Published:
2022-05-06
Contact:
Peigang Liu
E-mail:3130000936@zju.edu.cn;dongfangwy@upc.edu.cn
摘要:
长石次生溶孔是致密砂岩储层微-纳米级别孔喉网络的重要组成部分。为进一步明确碱性长石溶孔发育特征及其对致密砂岩储层物性的改造作用,以鄂尔多斯盆地中南部华庆地区三叠系延长组6段3亚段(长63亚段)致密砂岩储层为研究对象,利用能谱分析获取各类长石的钾、钠元素分布特征及组成特点;基于Image J软件对场发射环境扫描电镜图像进行二值化处理及参数提取,分别对具有典型溶蚀特征的波状条纹长石和斑块状条纹长石进行图像分析和理论计算,提出了基于溶蚀强度参数评价储层溶孔对储集空间贡献程度的方法;定量评价了长石溶蚀对孔隙发育的影响,精准刻画了长石发育特征、溶蚀率及孔隙度贡献率等参数。图像分析和理论计算结果表明,研究区碱性长石溶蚀微孔主要由弱溶蚀作用形成,形态特征为条带状和蜂窝状,面孔率大小分布在2.06 %~35.20 %,平均值为13.99 %,因溶蚀作用形成的孔隙面积占比与碱性长石中K+富含区域面积大小呈负相关。
中图分类号:
表1
鄂尔多斯盆地华庆地区长63亚段致密砂岩储层碱性长石能谱数据"
分类 | 测试编号 | 矿物类型 | 元素含量/% | ||||||
---|---|---|---|---|---|---|---|---|---|
K | Na | Ca | Al | Si | C | O | |||
波状条纹长石 | 1 | 钾长石 | 5.13 | 0.77 | 0 | 6.43 | 19.44 | 2.70 | 65.53 |
2 | 钾长石 | 4.82 | 1.04 | 0 | 6.24 | 19.89 | 4.29 | 63.72 | |
3 | 钾长石 | 5.22 | 0.70 | 0 | 6.06 | 19.44 | 2.79 | 65.79 | |
4 | 钾长石 | 7.01 | 0 | 0 | 5.51 | 18.40 | 2.64 | 66.44 | |
5 | 钾长石 | 5.14 | 0.75 | 0 | 6.21 | 19.33 | 3.84 | 64.73 | |
6 | 钾长石 | 4.76 | 0 | 0 | 6.17 | 17.32 | 11.29 | 60.46 | |
平均值 | 5.35 | 0.54 | 0 | 6.10 | 18.97 | 4.59 | 64.45 | ||
7 | 钠长石 | 0 | 5.96 | 0 | 5.85 | 19.48 | 2.38 | 66.33 | |
8 | 钠长石 | 0 | 6.28 | 0.58 | 6.48 | 17.85 | 3.05 | 65.76 | |
9 | 钠长石 | 0 | 5.73 | 0 | 6.00 | 18.76 | 3.63 | 65.88 | |
10 | 钠长石 | 0 | 6.17 | 0.65 | 6.82 | 18.66 | 3.14 | 64.56 | |
11 | 钠长石 | 0 | 5.65 | 0 | 5.60 | 16.98 | 12.63 | 59.14 | |
12 | 钠长石 | 0 | 6.27 | 0 | 6.00 | 18.63 | 6.06 | 63.04 | |
平均值 | 0 | 6.01 | 0.62 | 6.13 | 18.39 | 5.15 | 64.12 | ||
斑块状条纹长石 | 1 | 钾长石 | 4.99 | 0 | 0 | 6.27 | 20.42 | 3.60 | 64.72 |
2 | 钾长石 | 5.14 | 0.71 | 0 | 5.90 | 19.00 | 4.68 | 64.57 | |
3 | 钾长石 | 5.49 | 0.26 | 0 | 6.17 | 19.40 | 3.32 | 65.36 | |
4 | 钾长石 | 5.41 | 0.26 | 0 | 6.23 | 19.04 | 3.45 | 65.61 | |
5 | 钾长石 | 5.68 | 0.67 | 0 | 5.86 | 18.76 | 2.86 | 66.17 | |
6 | 钾长石 | 5.29 | 0.38 | 0 | 6.57 | 19.76 | 3.85 | 64.15 | |
平均值 | 5.33 | 0.38 | 0 | 6.17 | 19.40 | 3.63 | 65.10 | ||
7 | 钠长石 | 0 | 5.95 | 0.82 | 7.06 | 18.21 | 2.37 | 65.59 | |
8 | 钠长石 | 0 | 6.56 | 0 | 6.18 | 18.80 | 4.19 | 64.27 | |
9 | 钠长石 | 0 | 6.23 | 0.54 | 6.32 | 18.72 | 3.16 | 65.03 | |
10 | 钠长石 | 0 | 6.27 | 0 | 6.11 | 18.99 | 2.51 | 66.12 | |
11 | 钠长石 | 0 | 5.30 | 0 | 4.80 | 14.99 | 17.74 | 57.17 | |
12 | 钠长石 | 0 | 6.65 | 0 | 6.26 | 19.49 | 2.51 | 65.09 | |
平均值 | 0 | 6.16 | 0.68 | 6.12 | 18.20 | 5.41 | 63.88 |
表2
致密储层长石次生溶孔孔隙度理论计算结果[24-25]"
矿物类型 | 长石溶蚀过程反应式 | 反应前、后矿物体积差/cm3 | 参加反应矿物总体积/cm3 | 理论溶蚀孔隙度/% |
---|---|---|---|---|
钾长石 | 初期:1 mol钾长石→1/2 mol高岭石+2 mol石英 | -14.05 | 109.1 | 12.88 |
后期:1 mol钾长石→1/3 mol伊利石+2 mol石英 | -16.80 | 109.1 | 15.40 | |
钠长石 | 初期:1 mol钠长石→1/2 mol高岭石+2 mol石英 | -5.15 | 100.2 | 5.14 |
后期:1 mol钠长石→1/3 mol伊利石+2 mol石英 | -7.93 | 100.2 | 7.91 | |
钙长石 | 初期:1 mol钙长石→1 mol高岭石 | -1.40 | 100.7 | 1.39 |
后期:1 mol钙长石→2/3 mol伊利石 | -6.97 | 100.7 | 6.92 |
表3
鄂尔多斯盆地华庆地区长63亚段致密砂岩储层长石溶孔率与溶蚀强度判定"
样品编号 | 溶孔率/% | 总孔隙度/ % | 溶孔贡献率/% | 总溶孔贡献率/% | 溶蚀强度判定 | ||
---|---|---|---|---|---|---|---|
钾长石 | 钠长石 | 钾长石 | 钠长石 | ||||
2 | 0.70 | 0.33 | 10.90 | 6.43 | 3.03 | 9.45 | 弱溶蚀 |
4 | 0.60 | 0.28 | 5.95 | 10.14 | 4.78 | 14.92 | 弱溶蚀 |
7 | 1.16 | 0.55 | 8.84 | 13.16 | 6.20 | 19.37 | 中溶蚀 |
11 | 0.22 | 0.10 | 15.38 | 1.40 | 0.66 | 2.06 | 弱溶蚀 |
13 | 0.36 | 0.17 | 14.03 | 2.53 | 1.19 | 3.73 | 弱溶蚀 |
14 | 0.79 | 0.37 | 7.82 | 10.15 | 4.78 | 14.93 | 弱溶蚀 |
16 | 0.84 | 0.40 | 8.00 | 10.51 | 4.95 | 15.46 | 中溶蚀 |
17 | 0.48 | 0.23 | 7.49 | 6.47 | 3.05 | 9.52 | 弱溶蚀 |
18 | 1.63 | 0.77 | 6.83 | 23.93 | 11.28 | 35.20 | 强溶蚀 |
19 | 0.61 | 0.29 | 10.40 | 5.91 | 2.78 | 8.69 | 弱溶蚀 |
23 | 0.27 | 0.13 | 8.58 | 3.18 | 1.50 | 4.68 | 弱溶蚀 |
25 | 0.95 | 0.45 | 10.70 | 8.86 | 4.18 | 13.04 | 弱溶蚀 |
26 | 1.31 | 0.62 | 8.08 | 16.18 | 7.63 | 23.81 | 中溶蚀 |
27 | 1.53 | 0.72 | 10.74 | 14.28 | 6.73 | 21.01 | 中溶蚀 |
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