石油与天然气地质 ›› 2023, Vol. 44 ›› Issue (4): 976-992.doi: 10.11743/ogg20230414
王宏博1(), 马存飞1(), 曹铮2, 李志鹏3, 韩长城4, 纪文明1, 杨艺4
收稿日期:
2023-03-30
修回日期:
2023-06-01
出版日期:
2023-08-01
发布日期:
2023-08-09
通讯作者:
马存飞
E-mail:1240840474@qq.com;mcf-625@163.com
第一作者简介:
王宏博(1999—),男,硕士研究生,非常规油气储层地质学。E?mail: 基金项目:
Hongbo WANG1(), Cunfei MA1(), Zheng CAO2, Zhipeng LI3, Changcheng HAN4, Wenming JI1, Yi YANG4
Received:
2023-03-30
Revised:
2023-06-01
Online:
2023-08-01
Published:
2023-08-09
Contact:
Cunfei MA
E-mail:1240840474@qq.com;mcf-625@163.com
摘要:
综合利用岩心观察、铸体薄片鉴定、扫描电镜观察、样品孔渗测试和压汞分析等资料,结合区域埋藏史和油气充注史,对准噶尔盆地莫西庄地区下侏罗统三工河组储层成岩作用、岩相差异成岩机理及储层孔隙结构进行研究和对比分析。结果表明:三工河组在成岩演化过程中主要经历了机械压实作用、胶结作用和溶蚀作用。不同岩相储层成岩机理差异明显,钙质砂岩相、含泥质炭质纹层砂岩相和富火山凝灰质杂基砂岩相在早成岩阶段储层就趋于致密,至中成岩阶段成岩作用强度较弱;块状砂岩相在早成岩阶段孔隙保存完好,中成岩阶段流体运移通畅,经历了多期次的胶结作用和溶蚀作用;含砾砂岩和砾岩相砾石含量高,流体运移不畅,早成岩阶段压实作用弱,中成岩阶段表现为弱胶结、弱溶蚀的特征。岩相间不同的成岩机理对孔隙结构产生了决定性的影响,钙质砂岩相与含泥质炭质纹层砂岩相的孔隙连通性差、结构复杂,整体物性较差,不利于油气富集;块状砂岩相的孔喉分选性好,孔隙在所有岩相中最为发育且连通性强,整体物性好,有利于油气富集;含砾砂岩和砾岩相的颗粒分选差并紧密接触,孔隙连通性受到一定限制,但破坏性成岩作用强度较弱,总体物性较好,可以形成有效的油气储层。
中图分类号:
图4
莫西庄三工河组二段储层成岩作用特征显微照片a. 庄104井,埋深4 349.50 m,石英颗粒凹凸接触,正交光;b. 庄1-2井,埋深4 332.27 m,石英颗粒线性接触,正交光;c. 庄11井,埋深3 965.26 m,黑云母受强烈挤压变形,单偏光;d. 庄6井,埋深4 034.48 m,石英次生加大,单偏光;e. 庄110井,埋深4 288.20 m,方解石胶结,单偏光;f. 庄11井,埋深3 918.14 m,铁方解石胶结,单偏光;g. 庄11井,埋深3 965.26 m,硬石膏胶结,正交光;h. 庄1-3井,埋深4 328.15 m,长石溶蚀,自生黏土矿物充填残余粒间孔隙,单偏光;i. 庄1-3井,埋深4 328.08 m,绿泥石、高岭石及微晶石英充填粒间孔隙,扫描电镜;j. 庄1-3井,埋深4 342.80 m,伊利石充填长石溶蚀孔隙,扫描电镜;k. 庄104井,埋深4 357.15 m,长石溶蚀,单偏光;l. 庄1井,埋深4 375.38 m,石英边缘溶蚀,单偏光"
表1
莫西庄三工河组二段孔隙结构分类"
孔隙结构类型 | 孔隙度/% | 渗透率/(10-3 μm2) | 排驱压力/MPa | 平均孔径/μm | 特征 |
---|---|---|---|---|---|
Ⅰ型 | 8.1~9.9 (平均8.9) | 82.26~160.68 (平均120.24) | <0.1 | 5.00~10.00 | 储层孔喉分选性好,粗歪度,喉道类型以片状、弯片状为主,少量缩颈型喉道 |
Ⅱ型 | 8.2~10.7 (平均9.1) | 1.56~4.72 (平均2.89) | 0.1~1.0 | 1.00~5.00 | 孔喉分选性中等,略粗歪度,喉道类型以片状、弯片状为主,少量缩颈型喉道 |
Ⅲ型 | 4.8~9.2 (平均7.0) | 82.26~160.68 (平均120.24) | 0.2~1.0 | 0.10~5.00 | 孔喉分选性差,细歪度,喉道多为管束状或喉道不发育 |
Ⅳ型 | 1.8~8.9 (平均5.1) | 0.01~0.31 (平均0.19) | 1.0~2.5 | 0.01~0.10 | 极细歪度 |
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