Pore Characteristics and Factors Controlling Lacustrine Shales from the Upper Cretaceous Qingshankou Formation of the Songliao Basin, Northeast China: A Study Combining SEM, Low-temperature Gas Adsorption and MICP Experiments,Acta Geologica Sinica-English Edition

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Pore Characteristics and Factors Controlling Lacustrine Shales from the Upper Cretaceous Qingshankou Formation of the Songliao Basin, Northeast China: A Study Combining SEM, Low-temperature Gas Adsorption and MICP Experiments
Acta Geologica Sinica-English Edition ( IF 3.5 ) Pub Date : 2020-12-14 , DOI: 10.1111/1755-6724.14419
Hui HAN _{1,

2,

3,

4} , Chen GUO ₁ , Ningning ZHONG ₃ , Peng PANG ₁ , Zhengang DING ₁ , Jianping CHEN ₅ , Zhenkai HUANG ₅ , Yuan GAO ₆ , Jinyu LUO ₁ , Qirui LI ₁ , Zhaokun ZHANG ₁

Affiliation

To investigate pore characteristics and the factors controlling lacustrine shales, geochemical, mineralogical and petrophysical experiments were performed on 23 shale samples from the Qingshankou Formation of the Songliao Basin, China. A comparison of mercury injection capillary pressure (MICP) and low-temperature N₂ adsorption pore-size distribution showed that MICP has a higher pore-size distribution (PSD) line in its overlapping pore diameter range, which may be elevated by the higher pressure of MICP. Therefore, in the overlapping range, low-temperature N₂ adsorption data were preferred in pore characterization. Negative correlations were observed between pore volumes and TOC content, indicating organic matter pores are not well-developed in the studied samples. This may be related to their low grade of maturity and type I kerogens. There existed negative relationships between pore volumes and S₁, which illustrated that liquid hydrocarbons occupied some pore space. Micropore volume had a better correlation with S₁ than mesopore and macropore volumes, which suggests that liquid hydrocarbons preferentially occur in micropores. No obvious relationships between pore volumes and quartz or feldspar were observed, while pore volumes increased with the increasing clay mineral content. These relationships indicate that intraparticle pores in clay minerals represent the principal pore type.

中文翻译：

东北松辽盆地上白垩统青山口组湖相页岩孔隙特征及控制因素：结合SEM，低温气体吸附和MICP实验研究

为了研究孔隙特征和控制湖相页岩的因素，对松辽盆地青山口组的23个页岩样品进行了地球化学，矿物学和岩石物理实验。汞注入毛细管压力（MICP）和低温N ₂吸附孔径分布的比较表明，MICP在其重叠的孔径范围内具有较高的孔径分布（PSD）线，较高的压力可能会使其升高MICP。因此，在重叠范围内，低温N ₂在孔表征中优选吸附数据。在孔体积和TOC含量之间观察到负相关，表明在研究的样品中有机物孔不发达。这可能与它们的低成熟度和I型干酪根有关。孔隙体积与S ₁之间存在负相关关系，说明液态烃占据了一定的孔隙空间。微孔体积与S ₁具有更好的相关性比中孔和大孔体积要大，这表明液态烃优先出现在微孔中。没有观察到孔体积与石英或长石之间的明显关系，而孔体积随粘土矿物质含量的增加而增加。这些关系表明粘土矿物中的颗粒内孔隙代表主要的孔隙类型。

更新日期：2020-12-14

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