Visualization of dynamic micro-migration of shale oil and investigation of shale oil movability by NMRI combined oil charging/water flooding experiments: A novel approach

Zhang, Yuanhao; Chang, Jiaqi; Jiang, Zhenxue; Gao, Zhiye; Zhang, Chengju; Wang, Guozhen; Shao, Xindi; He, Wenjun

doi:10.1016/j.marpetgeo.2024.106907

Cited by 3 publications

(1 citation statement)

References 74 publications

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“…Shale layers are characterized by tight reservoirs with low porosity and permeability, making oil extraction challenging. ,, Therefore, during shale oil exploration, not only the role of the in situ oil content of shale needs to be assessed , but the mobility of the crude oil within the shale layer also needs to be assessed . Currently, both domestic and international scholars are still in the exploratory stage regarding the mobility issue of shale oil.…”

Section: Results and Disscussionmentioning

confidence: 99%

Graded Evaluation and Controls on In Situ Oil Content within Lacustrine Shale of the Upper Cretaceous Qingshankou Formation, Songliao Basin, China

Shao,

Song,

Jiang

et al. 2024

Energy Fuels

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A pyrolysis parameter S 1 is widely used to evaluate the oiliness of rocks. When the S 1 (free hydrocarbon) is used to evaluate shale oil resources, there is often a phenomenon of light hydrocarbon loss and heavy hydrocarbon loss, resulting in underestimation of the amount of resources. To accurately estimate the oil content of shale, this study establishes a light hydrocarbon recovery coefficient curve based on routine rock pyrolysis and related geochemical tests, and calculates a heavy hydrocarbon correction coefficient. This study have ascertained the in situ oil content of the Qingshankou Formation shale in the northern part of the Songliao Basin, identified the controlling factors of in situ oil content, and quantitatively assessed the mobility and movable resource volume of shale oil. The research reveals that light hydrocarbon loss ranges from 0.01 to 8.69 mg HC/g Rock, heavy hydrocarbon loss varies between 0.04 and 4.05 mg HC/g Rock, and in situ oil content spans from 0.04 to 16.38 mg HC/g Rock. The latter accounts for roughly 3.9 to 6.3 times the measured S 1 , indicating that the district is mainly enriched and moderately riched with resources. Organic matter abundance, thermal evolution degree, and reservoir structure are the principal factors controlling the in situ oil content of shale. Movable oil content ranges from 0.02 to 11.30 mg HC/g Rock, and the movable resource quantity approximates 84.84 × 10 8 t, constituting about 59.45% of the total resources, suggesting large potential and high mobility.The results of this study can provide theoretical and practical guidance for shale oil resource evaluation and sweet spot optimization in the regional area.

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Section: Results and Disscussionmentioning

confidence: 99%

Graded Evaluation and Controls on In Situ Oil Content within Lacustrine Shale of the Upper Cretaceous Qingshankou Formation, Songliao Basin, China

Shao,

Song,

Jiang

et al. 2024

Energy Fuels

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Complementary laboratory experiments and molecular dynamics simulation method to investigate the mobility of shale oil: The Permian Fengcheng Formation in the Mahu Sag, Junggar Basin

Chang,

Jiang,

Jin

et al. 2024

Marine and Petroleum Geology

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The Occurrence Characteristics and Enrichment Patterns of Shale Oil in Different Lithofacies: A Case Study of the Fengcheng Formation in the Mahu Sag

Jia,

Yang,

Gao

et al. 2024

ACS Omega

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The supply of shale oil is of significant importance to the sustainability of energy resources. However, due to the diversity of shale lithofacies, the occurrence characteristics and enrichment patterns of free oil and adsorbed oil remain unclear. Based on this, taking the shale oil reservoir of the Fengcheng Formation in the Mahu Sag as the research object, a series of experiments were conducted, including X-ray diffraction analysis (XRD), total organic carbon (TOC) content analysis, high-pressure mercury injection (HPMI), and field emission scanning electron microscopy (FE-SEM). In addition, multitemperature pyrolysis was used to preliminarily determine the contents of free oil and adsorbed oil in different lithofacies, and a laser scanning confocal microscope (LSCM) was employed to visually characterize the occurrence characteristics of shale oil at the lamina scale. Principal component analysis (PCA) was combined to assess the effect of pore structure parameters on the contents of free oil and adsorbed oil in different lithofacies. The results showed that the samples could be categorized into three lithofacies: continuous laminated felsic shale, discontinuous laminated felsic shale, and agglomerated mixed shale. Based on sedimentary structural characteristics, the shale oil in the continuous laminated felsic shale indicated obviously laminated distribution, while for the shale oil in the discontinuous laminated felsic shale, the laminated distribution of shale oil was weakly distributed, exhibiting a district distribution along the fracture. The histogram counts of the two lithofacies adsorbed oil fluorescence were higher than those of the free oil. The agglomerated mixed shale oil was widely distributed and exhibited a platy pattern, and the histogram counts of the free oil fluorescence were higher than those of the adsorbed oil. Analysis of the pore principal component parameter F (including neighborcount, rugosity, aspect ratio, and symmetry) revealed that the pores in the continuous laminated felsic shale and the discontinuous laminated felsic shale could provide more effective adsorption sites, resulting in higher contents of adsorbed oil. The pore type of the agglomerated mixed shale was quite different from the other two lithofacies, with higher free oil content compared with adsorbed oil. Combined with the sedimentary structure and the occurrence characteristics of shale oil, the shale oil enrichment patterns were finally categorized into lamina-pore controlled type, lamina-pore-fracture controlled type, and fracture-pore controlled type, respectively. Overall, this study aims to facilitate efficient exploration and production of shale oil and gas resources.

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Visualization of dynamic micro-migration of shale oil and investigation of shale oil movability by NMRI combined oil charging/water flooding experiments: A novel approach

Cited by 3 publications

References 74 publications

Graded Evaluation and Controls on In Situ Oil Content within Lacustrine Shale of the Upper Cretaceous Qingshankou Formation, Songliao Basin, China

Graded Evaluation and Controls on In Situ Oil Content within Lacustrine Shale of the Upper Cretaceous Qingshankou Formation, Songliao Basin, China

Complementary laboratory experiments and molecular dynamics simulation method to investigate the mobility of shale oil: The Permian Fengcheng Formation in the Mahu Sag, Junggar Basin

The Occurrence Characteristics and Enrichment Patterns of Shale Oil in Different Lithofacies: A Case Study of the Fengcheng Formation in the Mahu Sag

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