致密砂岩砂-泥结构发育特征及其对储集空间的控制作用

doi:10.11743/ogg20230508

Abstract

Abstract:

The swift shifts in sedimentary water bodies in continental petroliferous sedimentary basins result in frequent intercalation of sandstone and mudstone layers. Various sandstone-mudstone intercalation patterns （sand-mud assemblages） lead to significant differences in the storage spaces in sandstone reservoirs. Focusing on the lower submember of the 3^rd member of the Paleogene Shahejie Formation in the Linnan sub-sag， Huimin Sag， Bohai Bay Basin， we first analyze the spatial assemblages and single-layer thickness of sandstone and mudstone layers. Using casting thin section observations， physical property tests， and micro-CT scanning， we systematically elucidate the physical properties， pore types， and pore structures of sandstone reservoirs with different sand-mud assemblages. As indicated by the findings， the lower submember contains nine types of sand-mud assemblages， namely thick mudstone interbedded with thin sandstone， medium mudstone interbedded with thin sandstone， thick mudstone interbedded with medium sandstone， intercalated thin sandstone and thin mudstone， intercalated medium sandstone and medium mudstone， intercalated thick sandstone and thick mudstone， medium sandstone interbedded with thin mudstone， thick sandstone interbedded with medium mudstone， and thick sandstone interbedded with thin mudstone. The ionic interactions between sandstones and mudstones lead to strong heterogeneity in the storage capacity of sandstone reservoirs with different sand-mud assemblages. For sand-mud assemblages with low net-to-gross ratios， mudstones supply ample CO₃^2-， Ca²⁺， Fe²⁺， and Mg²⁺ to sandstones， and sandstones are completely filled with cements. Consequently， the sandstone reservoirs become extremely tight. However， when this ratio rises， mudstones cannot provide sandstones with sufficient ions mentioned above. In this case， sandstones near the sand-mud interfaces exhibit strong carbonate cementation， forming extremely tight reservoirs. In contrast， the interior of the sandstones shows weak carbonate cementation， with a small number of primary pores present. Additionally， the sand-mud assemblages with relatively thick sandstones promote organic acid infiltration， enhancing reservoir quality through the formation of numerous intergranular dissolution pores. Based on the differences in sand-mud assemblages， we reveal the influence of sand-mud assemblages on the evolutionary path and model of the storage spaces in sandstone reservoirs. Our insights are pivotal for predicting sweet spots in tight sandstone reservoirs.

Key words: cementation, pore structure, sand-mud assemblage, tight reservoir, Jiyang Depression, Bohai Bay Basin

CLC Number:

TE122.2

Junliang LI, Xin WANG, Weiqing WANG, Bo LI, Jianhui ZENG, Kunkun JIA, Juncheng QIAO, Kangting WANG. Influence of sand-mud assemblages in tight sandstones on reservoir storage spaces： A case study of the lower submember of the 3^rd member of the Paleogene Shahejie Formation in the Linnan sub-sag， Bohai Bay Basin[J]. Oil & Gas Geology, 2023, 44(5): 1173-1187.

Figures/Tables 16

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砂-泥结构类型	砂岩厚度/m	泥岩厚度/m	砂/地比
厚泥岩夹薄砂岩	<1.0	>3.5	0 ~ 0.125
中泥岩夹薄砂岩	<1.0	1.5 ~ 3.5	0 ~ 0.250
厚泥岩夹中砂岩	1.0 ~ 2.5	>3.5	0 ~ 0.263
薄砂岩-薄泥岩互层	<1.0	<1.5	0.250 ~ 0.571
中砂岩-中泥岩互层	1.0 ~ 2.5	1.5 ~ 3.5	0.263 ~ 0.571
厚砂岩-厚泥岩互层	>2.5	>3.5	0.263 ~ 0.588
中砂岩夹薄泥岩	1.0 ~ 2.5	<1.5	0.571 ~ 1.000
厚砂岩夹中泥岩	>2.5	1.5 ~ 3.5	0.588 ~ 1.000
厚砂岩夹薄泥岩	>2.5	<1.5	0.769 ~ 1.000

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Influence of sand-mud assemblages in tight sandstones on reservoir storage spaces： A case study of the lower submember of the 3^rd member of the Paleogene Shahejie Formation in the Linnan sub-sag， Bohai Bay Basin

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Influence of sand-mud assemblages in tight sandstones on reservoir storage spaces： A case study of the lower submember of the 3rd member of the Paleogene Shahejie Formation in the Linnan sub-sag， Bohai Bay Basin

RichHTML

PDF (PC)

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Abstract

Cite this article

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Figures/Tables 16

References 43

Related Articles 15

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Influence of sand-mud assemblages in tight sandstones on reservoir storage spaces： A case study of the lower submember of the 3^rd member of the Paleogene Shahejie Formation in the Linnan sub-sag， Bohai Bay Basin