基于扫描电镜大视域拼接技术定量表征致密储层微观非均质性

doi:10.11743/ogg20220618

Abstract

Abstract:

High-resolution scanning electron microscope （SEM） is the most intuitive method to study the heterogeneity of tight reservoirs， though the problem of representation of view area is yet to be solved. The tight reservoir of the third member of the Hetaoyuan Formation in the Biyang Sag is taken to quantitatively reveal the micro heterogeneity of tight reservoirs of diverse types with large-view splicing technology of field emission scanning electron microscope （FE-SEM）. The results show that the main types of tight sandstone reservoir space in the study area include intergranular pores and intragranular pores， together with a few micro-fractures， and the shale reservoir space types are also dominated by intergranular and intragranular pores， with relatively few organic pores or micro-fractures. The micro heterogeneity of minerals and pores in tight reservoir rocks such as mudstone， shale， argillaceous siltstone and sandstone are discussed by combining FE-SEM technology with statistical method. The view area of a square with a side length of 160 μm， 300 μm， 300 μm and 1 000 μm can be regarded as representative view area of mineral micro heterogeneity of the four lithological types of tight reservoirs mentioned above， and the view area of a square with a side length of 200 μm， 300 μm， 300 μm and 800 μm can be used as the representative view area of their pores' micro heterogeneity respectively. Thus it can be seen that there are marked differences in micro heterogeneity among different types of tight reservoirs， that is， the micro heterogeneity of sandstone， that of argillaceous siltstone and shale， and that of mudstone ever decreasing in order. Considering the micro heterogeneity of minerals and pores， the view area of a square with a side length of 200 μm， 300 μm， 300 μm and 1 000 μm can be used， respectively， as the representative view area of micro heterogeneity of the mudstone， shale， argillaceous siltstone and sandstone reservoirs in the study area.

Key words: mineral micro heterogeneity, pore micro heterogeneity, large-view splicing technology, tight reservoir, Biyang Sag, Nanxiang Basin

CLC Number:

TE122.2

Wenhao Li, Shuangfang Lu, Min Wang, Nengwu Zhou, Zehu Cheng. Quantitative characterization of micro heterogeneity of tight reservoirs by large-view FE-SEM splicing technology[J]. Oil & Gas Geology, 2022, 43(6): 1497-1504.

Figures/Tables 7

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Quantitative characterization of micro heterogeneity of tight reservoirs by large-view FE-SEM splicing technology

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