石油与天然气地质 ›› 2023, Vol. 44 ›› Issue (5): 1308-1320.doi: 10.11743/ogg20230519
王鑫1,2(), 曾溅辉1,2(), 贾昆昆1,2, 王伟庆3, 李博3, 安丛1,2, 赵文4
收稿日期:
2023-05-01
修回日期:
2023-06-07
出版日期:
2023-10-19
发布日期:
2023-10-19
通讯作者:
曾溅辉
E-mail:xinwang.geo@outlook.com;zengjh@cup.edu.cn
第一作者简介:
王鑫(1993—),男,博士研究生,盆地流体分析与储层评价。E-mail: 基金项目:
Xin WANG1,2(), Jianhui ZENG1,2(), Kunkun JIA1,2, Weiqing WANG3, Bo LI3, Cong AN1,2, Wen ZHAO4
Received:
2023-05-01
Revised:
2023-06-07
Online:
2023-10-19
Published:
2023-10-19
Contact:
Jianhui ZENG
E-mail:xinwang.geo@outlook.com;zengjh@cup.edu.cn
摘要:
润湿性对低渗透砂岩中流体的渗流能力具有关键的控制作用。在成岩演化过程中,低渗透砂岩储层流体性质、矿物类型及成分变化频繁,导致润湿性演化机制尚不明确,严重制约了低渗透油气成藏机理的研究工作。以渤海湾盆地东营凹陷古近系沙河街组四段上亚段为例,基于地质资料分析,采用铸体薄片观察、X射线衍射矿物组分分析、基于核磁共振技术的高温高压Amott法润湿性实验和高温高压固-油-水接触角实验,系统分析成岩作用对低渗透砂岩储层润湿性的控制作用。研究结果表明:复杂多样的成岩作用导致不同成岩阶段发育的主要孔隙类型存在差异。在早成岩A期、B期及中成岩A1期、A2期和B期的这5个成岩阶段,低渗透砂岩储层发育的主要孔隙类型依次为压实残余孔、长石溶蚀粒内孔-碳酸盐溶蚀粒间孔、石英边缘溶蚀孔、长石溶蚀粒内孔-碳酸盐溶蚀粒间孔和裂缝。随着成岩演化的进行,压实残余孔、石英边缘溶蚀孔和长石溶蚀粒内孔亲水性变强,而方解石溶蚀粒间孔亲油性变强,白云石溶蚀粒间孔由水润湿变为中性润湿。同时,不同成岩阶段发育的主要孔隙类型及其表面润湿特性决定了低渗透砂岩整体的润湿性。在成岩过程中低渗透砂岩润湿性主要表现为水润湿的特性,在从早到晚的5个成岩阶段依次为强亲水性、弱亲水性、亲水性、中性和亲水性。最后,建立了成岩作用控制下砂岩储层润湿性演化模式,对指导低渗透砂岩储层的甜点预测具有重要意义。
中图分类号:
表1
东营凹陷古近系沙河街组四段上亚段5块砂岩样品岩石成分、岩石结构及其成岩阶段划分"
样品 编号 | 井号 | 深度/m | 石英含量/% | 长石含量/% | 岩屑含量/% | 粒径中值/ mm | 分选系数 | I/S混层比 | 成岩阶段 | 实验所设温度/℃ | 实验所设压力/MPa | ||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
岩浆岩 | 变质岩 | 沉积岩 | |||||||||||
1 | 樊127 | 2 390 | 47 | 34 | 3 | 12 | 4 | 0.091 | 1.59 | 80 | 早成岩A期 | 50 | 10 |
2 | 高89 | 2 993 | 53 | 30 | 1 | 14 | 2 | 0.081 | 1.59 | 50 | 早成岩B期 | 80 | 20 |
3 | 滨420 | 2 658 | 43 | 35 | 3 | 25 | 4 | 0.092 | 1.61 | 30 | 中成岩A1期 | 100 | 27 |
4 | 纯108 | 3 052 | 48 | 37 | 6 | 8 | 1 | 0.089 | 1.58 | 20 | 中成岩A2期 | 120 | 48 |
5 | 史146 | 3 814 | 43 | 40 | 4 | 8 | 5 | 0.017 | 1.63 | 10 | 中成岩B期 | 145 | 55 |
图3
东营凹陷古近系沙河街组四段上亚段滩坝砂岩典型成岩作用及其镜下特征a. 高95井, 埋深1 650.70 m,颗粒点-线接触,单偏光;b. 梁104井, 埋深2 883.91 m,颗粒线-凹凸接触,正交光;c. 滨438井, 埋深3 809.10 m,颗粒凹凸-缝合接触,正交光;d. 樊170井, 埋深3 681.10 m,矿物颗粒定向排列且塑性矿物弯曲变形,正交光;e.梁223井, 埋深2 959.00 m,石英次生加大边,正交光;f. 滨420井, 埋深2 670.80 m,铁方解石胶结且交代石英,正交光;g. 高89井, 埋深2 995.20 m,铁白云石胶结且交代长石和白云石,铁方解石胶结且交代方解石和石英加大边,单偏光;h. 滨420井, 埋深2 660.84 m,方解石胶结,铁方解石胶结且交代方解石和石英加大边,单偏光;i. 滨420井, 埋深2 652.60 m,长石颗粒内部溶蚀,正交光;j. 滨420井, 埋深2 621.97 m,方解石和铁方解石颗粒间溶蚀,单偏光;k. 樊137井, 埋深3 170.50 m,方解石和铁方解石颗粒间溶蚀,石英颗粒边缘溶蚀,单偏光;l. 滨438井, 埋深3 809.30 m,石英颗粒边缘溶蚀,正交光"
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