石油与天然气地质 ›› 2024, Vol. 45 ›› Issue (4): 1079-1088.doi: 10.11743/ogg20240413
解馨慧1,2(), 邓虎成3, 胡蓝霄3, 李勇1, 毛金昕3, 刘佳杰1, 张鑫1, 李柏洋1
收稿日期:
2023-12-01
修回日期:
2024-08-01
出版日期:
2024-09-05
发布日期:
2024-09-05
第一作者简介:
解馨慧(1993—),女,博士、讲师,非常规油气地质。E‑mail: xxh0622@cdut.edu.cn。
基金项目:
Xinhui Xie1,2(), Hucheng Deng3, Lanxiao Hu3, Yong Li1, Jinxin Mao3, Jiajie Liu1, Xin Zhang1, Boyang Li1
Received:
2023-12-01
Revised:
2024-08-01
Online:
2024-09-05
Published:
2024-09-05
摘要:
细粒沉积岩蕴藏着丰富的油气资源,为了研究细粒沉积岩颗粒微观结构及力学特征,以鄂尔多斯盆地上三叠统延长组7段细粒沉积岩为例,开展了扫描电镜观察和纳米压痕实验分析,据此研究细粒沉积颗粒的几何特征和微观力学性质。研究认为:用粒径、扁平度、棱角性、硬度和弹性模量5个特征参数,可将细粒沉积岩划分为粒度+棱角型、扁平度+棱角型、扁平度+棱角+弹性模量+硬度型、弹性模量+硬度型、棱角+弹性模量+硬度型和粒度+棱角+弹性模量型6种主要颗粒类型;接着,根据颗粒类型的相对含量,进一步将颗粒类型划分为5种组合类型;最后,分析了细粒沉积颗粒类型与矿物类型之间的耦合关系。细粒沉积岩颗粒微观分类方案的建立,有助于理解细粒沉积岩微观结构特征,预测地质“甜点”空间分布,对细粒沉积岩的油气资源评价和效益开发具有重要的理论和科学意义。
中图分类号:
图3
鄂尔多斯盆地长7段陆源碎屑和自生矿物颗粒微观形态特征扫描电镜照片(据文献[30]修改)a. 单晶结构的石英颗粒群,W19井, 埋深1 241.1m;b. 石英内发育粒内溶孔,W19井, 埋深1 241.1 m;c. 部分长石被溶蚀,见粒内溶孔,W19井, 埋深1 241.1 m;d. 长石沿解理溶蚀,见次生溶蚀孔,W19井, 埋深1 241.1 m;e. 片状云母,发育片间孔隙,W22井, 埋深1 004.2 m;f. 霉球状黄铁矿,W22井, 埋深1 004.2 m;g. 有机质-黄铁矿结构体,黄铁矿被有机质包裹,W22井, 埋深1 004.2 m; h. 方解石,有轻度溶蚀现象,W8井, 埋深998.5 m; i. 方解石表面发育溶蚀孔,W8井, 埋深998.5 m;j. 白云石及其晶间孔隙发育,W24井, 埋深1 021.8 m;k.叠层状高岭石,W13井, 埋深904.5 m;l. 片状蒙脱石,微孔发育,顺层排列,W13井, 埋深904.5 m; m. 薄膜状有机质发育,W23井, 埋深893.1 m;n. 自然剖面上条带状有机质,W23井, 埋深893.1 m;o. 条带状有机质,弯曲分布,W23井, 埋深893.1 m"
表2
鄂尔多斯盆地长7段矿物颗粒的微观力学参数值"
矿物颗粒 | 弹性模量分布区间/GPa | 弹性模量平均值/GPa | 硬度分布区间/GPa | 硬度平均值/GPa |
---|---|---|---|---|
石英 | 22.84~125.43 | 69.62 | 3.10~38.80 | 12.10 |
长石 | 42.00~102.11 | 67.82 | 1.50~12.52 | 6.18 |
黏土矿物 | 7.30~99.34 | 50.38 | 1.37~11.17 | 4.85 |
方解石 | 11.17~113.70 | 55.73 | 1.44~7.09 | 4.03 |
白云石 | 25.13~77.57 | 49.76 | 0.82~12.93 | 4.32 |
黄铁矿 | 253.90~293.20 | 273.90 | 30.12~39.80 | 34.79 |
有机质 | 0.40~4.70 | 2.50 | 0.20~1.10 | 0.53 |
表3
鄂尔多斯盆地长7段矿物颗粒类型与矿物成分相关关系"
矿物组分含量 | 相关系数R2 | |||||
---|---|---|---|---|---|---|
类型一占比 | 类型二占比 | 类型三占比 | 类型四占比 | 类型五占比 | 类型六占比 | |
石英含量 | 0.214(+) | 0.554(-) | 0.526(-) | 0.269(+) | 0.871(+) | 0.009(+) |
长石含量 | 0.013(-) | 0.656(+) | 0.710(-) | 0.157(-) | 0.120(+) | 0.287(+) |
黄铁矿含量 | 0.342(+) | 0.467(-) | 0.243(-) | 0.659(+) | 0.230(-) | 0.260(-) |
黏土矿物含量 | 0.361(-) | 0.509(+) | 0.252(+) | 0.293(-) | 0.548(-) | 0.197(-) |
TOC | 0.644(+) | 0.553(-) | 0.241(-) | 0.285(+) | 0.200(+) | 0.289(-) |
黏土矿物含量+TOC | 0.010(-) | 0.204(-) | 0.872(+) | 0.030(+) | 0.444(-) | 0.345(-) |
方解石+白云石+长石含量 | 0.070(-) | 0.285(+) | 0.730(-) | 0.207(-) | 0.100(+) | 0.453(+) |
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