石油与天然气地质 ›› 2022, Vol. 43 ›› Issue (6): 1497-1504.doi: 10.11743/ogg20220618
收稿日期:
2022-02-13
修回日期:
2022-09-12
出版日期:
2022-11-21
发布日期:
2022-11-21
通讯作者:
卢双舫
E-mail:liwh@upc.edu.cn;lushuangfang@upc.edu.cn
第一作者简介:
李文浩(1985—), 男, 副教授、硕士生导师,非常规油气地质、古海洋学与有机地球化学。E-mail: 基金项目:
Wenhao Li(), Shuangfang Lu(
), Min Wang, Nengwu Zhou, Zehu Cheng
Received:
2022-02-13
Revised:
2022-09-12
Online:
2022-11-21
Published:
2022-11-21
Contact:
Shuangfang Lu
E-mail:liwh@upc.edu.cn;lushuangfang@upc.edu.cn
摘要:
高分辨率扫描电镜技术是研究致密储层非均质性最直观的方法,但存在视域代表性的问题。以南襄盆地泌阳凹陷古近系核桃园组三段致密储层为例,基于扫描电镜大视域拼接技术,定量揭示了不同类型致密储层的微观非均质性。结果表明,研究区致密砂岩储集空间类型以粒间孔和粒内孔为主,同时发育少量微裂缝;泥页岩储集空间类型同样以粒间孔和粒内孔为主,有机孔和微裂缝相对较少。通过场发射扫描电镜大视域拼接技术与统计学方法结合,探讨了泥岩、页岩、泥质粉砂岩、砂岩等致密储层的矿物微观非均质性和孔隙微观非均质性。其中边长为160,300,300和1 000 μm的正方形视域面积可以分别作为上述4种岩性致密储层矿物微观非均质性代表视域面积;边长为200,300,300和800 μm的正方形视域面积可以分别作为上述4种岩性的孔隙微观非均质性代表视域面积。由此可见,不同岩石类型的致密储层,其微观非均质性存在明显差异,其中砂岩微观非均质性 > 泥质粉砂岩、页岩微观非均质性>泥岩微观非均质性。综合矿物微观非均质性和孔隙微观非均质性,可将边长为200,300,300和1 000 μm的正方形视域面积分别作为研究区泥岩、页岩、泥质粉砂岩和砂岩致密储层微观非均质性的代表视域面积。
中图分类号:
图2
泌阳凹陷核三段致密砂岩储层储集空间类型SEM图像a.长石、石英、方解石等矿物粒间孔, 泌212井, 埋深3 195.20 ~ 3 195.30 m; b.方解石和长石晶间孔和粒内溶孔发育, 可见少量有机孔, 泌212井, 埋深3 195.20 ~ 3 195.30 m; c.长石和粘土矿物晶间孔, 泌212井, 埋深3 195.20 ~ 3 195.30 m; d.少量晶间孔和粒内孔, 泌212井, 埋深3 195.20 ~ 3 195.30 m; e.粘土矿物层间缝发育, 泌212井, 埋深3 195.20 ~ 3 195.30 m; f. 有机孔, 泌212井, 埋深3 195.20 ~ 3 195.30 m; g, h.粒间孔和晶间孔, 安84井, 埋深3 031.72 ~ 3 031.87 m; i.发育少量粒内孔, 安84井, 埋深3 031.72 ~ 3 031.87 m; j, k.晶间孔较发育, 同时含少量粒内溶孔, 安84井, 埋深3 031.72 ~ 3 031.87 m; l.微裂缝, 安84井, 埋深3 031.72 ~ 3 031.87 m"
图3
泌阳凹陷核三段泥页岩储层储集空间类型SEM图像a.少量粒间孔和晶间孔, 泌246井, 埋深3 446.40 ~ 3 446.47 m; b, c.粘土矿物晶间孔、长石晶间孔和溶蚀孔, 泌246井, 埋深3 446.40 ~ 3 446.47m; d.少量层间缝及有机孔, 泌246井, 埋深3 446.40 ~ 3 446.47 m; e.晶间孔和溶蚀孔, 泌246井, 埋深3 446.40 ~ 3 446.47 m; f.有机质及部分有机孔, 泌246井, 埋深3 446.40 ~ 3 446.47 m; g.有机质及部分有机孔, 泌页1井, 埋深2 443.30 ~ 2 430.35 m; h.晶间孔和溶蚀孔, 泌页1井, 埋深2 443.30 ~ 2 430.35 m; i.层间缝, 泌页1井, 埋深2 443.30 ~ 2 430.35 m; j—l.粘土矿物晶间孔、长石晶间孔和溶蚀孔,泌页1井, 埋深2 443.30 ~ 2 430.35 m"
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