Oil & Gas Geology ›› 2024, Vol. 45 ›› Issue (4): 1079-1088.doi: 10.11743/ogg20240413
• Petroleum Geology • Previous Articles Next Articles
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
CLC Number:
Xinhui Xie, Hucheng Deng, Lanxiao Hu, Yong Li, Jinxin Mao, Jiajie Liu, Xin Zhang, Boyang Li. Micromechanical characteristics and classification of the grains of lacustrine fine-grained sedimentary rocks: A case study of shales in the 7th member of the Upper Triassic Yanchang Formation, Ordos Basin[J]. Oil & Gas Geology, 2024, 45(4): 1079-1088.
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Table 1
Morphology definition of the fine-grained sedimentary grains in the Chang 7 Member, Ordos Basin (modified after reference [15])"
形状名称 | 定义 | 沉积颗粒类别 | 颗粒形状示意图 | 扫描电镜照片 |
---|---|---|---|---|
似圆形 | 表面光滑,近似椭圆形 | 石英、菱铁矿 | ||
多角形 | 多面体形 | 方解石、石英、白云石等 | ||
不规则状 | 形状不对称的形体 | 絮凝颗粒、黏土矿物、有机质-矿物颗粒结合体 | ||
粒状体 | 具有相同等级量纲的不规则体 | 黄铁矿 | ||
片状 | 板片形状 | 云母、蒙脱石、伊/蒙混层、绿/蒙混层等 | ||
纤维状 | 规则或不规则的线状体 | 伊利石、云母等 | ||
多孔状 | 表面或体内发育孔隙 | 生烃有机质、溶蚀的脆性矿物颗粒等 |
Table 2
Micromechanical parameters of mineral grains in the Chang 7 Member, Ordos Basin"
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 |
Table 3
Relationships between mineral grain types and mineral components in the Chang 7 Member, Ordos Basin"
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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