Enrichment of free oil in alkaline lacustrine Fengcheng Formation in Mahu Sag

Liu, Kouqi; Jin, Zhijun; Zeng, Lianbo; Wang, Zhenlin; Ostadhassan, Mehdi; Wang, Yamin; Liang, Xu; Cao, Yan; Liu, Shuai

doi:10.1016/j.geoen.2023.212015

Cited by 2 publications

(2 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Fengcheng Formation, located in Mahu Sag, is considered to be the source area (rich in organic matter) and shale oil reservoir (rich in liquid) of Mahu Sag, and is currently the focus of shale oil research in this area. 7 This academic exploration contributes to a deeper understanding of the unique characteristics and commercial potential of shale oil in the Mahu Sag area.…”

Section: Introductionmentioning

confidence: 97%

“…Unlike North America, shale oil in China mostly exists in lacustrine facies with complex geological conditions and uneven geochemical characteristics. , The geological nature of continental shales in China, in comparison to North American marine shales, is marked by elevated pore structure complexity, pronounced heterogeneity, and limited organic pore development. − To date, China has successfully achieved commercial development of continental shale oil in silt-carbonate interbeds within shale units, such as Ordos Basin Chang 7 Member and Songliao Basin Qingshankou Formation. The Fengcheng Formation, located in Mahu Sag, is considered to be the source area (rich in organic matter) and shale oil reservoir (rich in liquid) of Mahu Sag, and is currently the focus of shale oil research in this area . This academic exploration contributes to a deeper understanding of the unique characteristics and commercial potential of shale oil in the Mahu Sag area.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Detailed Characterization of Pore Results of Continental Shale Reservoir in Fengcheng Formation, Mahu Sag

Zhang,

Liu,

Wang

et al. 2024

ACS Omega

Self Cite

View full text Add to dashboard Cite

The exploration potential of shale oil in the Fengcheng Formation of the Mahu Sag, located in the Junggar Basin, is significant. However, there is a notable dearth of research on shale oil within this formation. This study addresses this gap by focusing on the pore structure and associated development factors of the Fengcheng Formation in Mahu Sag. A total of 113 samples from well X of the Fengcheng Formation were meticulously selected for analysis. The mineral components and pore structure of these samples were characterized using advanced techniques, including X-ray diffraction (XRD), low-temperature nitrogen adsorption (LTNA), high-pressure mercury injection (HPMI), and scanning electron microscopy (SEM). The findings reveal that, despite a relatively low content of clay minerals in the Fengcheng Formation, their presence is intricately linked to pore development. The high content of feldspar in the formation contributes significantly to the formation of clay minerals through dissolution processes. This dual influence plays a crucial role in shaping the overall pore development within the Fengcheng Formation. In addition, a comparative analysis was conducted with shale samples from other wells within the Fengcheng Formation in Mahu Sag, as well as from different basins, such as the Songliao Basin and Ordos Basin. Different from Qingshankou Formation in Songliao Basin and Yanchang Formation in Ordos Basin, the samples from Fengcheng Formation in Mahu Sag are composed of a large number of felic minerals and carbonate minerals with less clay minerals. This study underscores the paramount importance of mineral components and their respective content in influencing the pore development of shale oil reservoirs. The unique characteristics of the Fengcheng Formation in Mahu Sag, as revealed through comprehensive analyses, contribute valuable insights to the understanding of shale oil exploration potential in the Junggar Basin.

show abstract

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Detailed Characterization of Pore Results of Continental Shale Reservoir in Fengcheng Formation, Mahu Sag

Zhang,

Liu,

Wang

et al. 2024

ACS Omega

Self Cite

View full text Add to dashboard Cite

show abstract

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

View full text Add to dashboard Cite

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.

show abstract

Enrichment of free oil in alkaline lacustrine Fengcheng Formation in Mahu Sag

Cited by 2 publications

References 39 publications

Detailed Characterization of Pore Results of Continental Shale Reservoir in Fengcheng Formation, Mahu Sag

Detailed Characterization of Pore Results of Continental Shale Reservoir in Fengcheng Formation, Mahu Sag

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

Contact Info

Product

Resources

About