Characteristics and Paleoenvironment of the Niutitang Shale Reservoir in the Zhenba Area DOI Open Access

Tao Tian,

Wei Chang, Pei Zhang

et al.

Processes, Journal Year: 2024, Volume and Issue: 12(11), P. 2595 - 2595

Published: Nov. 18, 2024

The lack of in-depth analysis on the reservoir characteristics and paleoenvironmental conditions Niutitang Formation in study area has led to an unclear understanding its geological background. In this study, core samples from well SZY1 were selected, X-ray diffraction (XRD), scanning electron microscopy (SEM), quantitative elemental employed systematically investigate properties paleoenvironment shales. results indicate that shales form a low-porosity, low-permeability reservoir. By utilizing indicators such as chemical index alteration (CIA) ratios, delves into paleoclimate paleoproductivity region. (La/Yb)n ratio is approximately 1, indicating rapid deposition rate beneficial for accumulation preservation organic matter. chondrite-normalized North American Shale Composite (NASC)-normalized rare earth element (REE) distribution patterns show consistent trends with minimal variation, reflecting presence mixed sources sediments area. Analysis reveals are enriched light rare-earth elements (LREEs) negative europium anomaly, primary source rocks sedimentary granitic, located far areas seafloor hydrothermal activity. NiEF CuEF values suggest high paleoproductivity, deposited anoxic-reducing environment. depositional environments Marcellus Utica United States, Wufeng-Longmaxi black Changning Sichuan Basin, similar, characterized by anoxic reducing well-developed fractures. thermal evolution degree relatively moderate, currently peak gas generation stage, quality rated medium high, good potential hydrocarbon promising exploration prospects.

Language: Английский

Dispersed organic matter from pre-Devonian marine shales: A review on its composition, origin, evolution, and potential for hydrocarbon prospecting DOI
Qingyong Luo,

Fariborz Goodarzi,

Ningning Zhong

et al.

Earth-Science Reviews, Journal Year: 2024, Volume and Issue: unknown, P. 105027 - 105027

Published: Dec. 1, 2024

Language: Английский

Citations

9
Oceanic redox variations during the Cambrian Age 2-3 in the Yangtze Block of South China: Evidence from pyrite-based proxies DOI
Fangliang Fu,

Caineng Zou,

Zhengfu Zhao

et al.

Marine and Petroleum Geology, Journal Year: 2025, Volume and Issue: unknown, P. 107438 - 107438

Published: May 1, 2025

Language: Английский

Citations

0
Identification and Application of Favorable Lithofacies Associations in the Transitional Facies of the Permian Longtan Formation in Central and Southern Sichuan Basin DOI Open Access

Longyi Wang,

Xizhe Li,

Yana Chen

et al.

Minerals, Journal Year: 2025, Volume and Issue: 15(3), P. 198 - 198

Published: Feb. 20, 2025

The transitional shale system of the Longtan Formation (LTF) is widely distributed in Sichuan Basin. However, lithofacies LTF exhibit vertical variations, with frequent interbedding blocks, and shale–sand–coal sequences, which makes identifying “sweet spots” a challenging task. To address this issue, associations were investigated based on well log analysis from 30 wells, experimental data 19 samples, including X-ray diffraction, total organic carbon (TOC), pore structure characterization, methane isothermal adsorption tests. Four classified: carbon–shale (I-1), shale(carbon)–coal (I-2), shale–sand (II), assemblage (III). A favorable association index (Com) was developed, providing quantitative method for lithofacies. results indicate that among four associations, I-2 most association. Com threshold defined as 0.6, lithofacies, it 0.7. Overall, are primarily Suining-Dazu Lujiao areas.

Language: Английский

Citations

0
Composition-based methane adsorption models for the Qiongzhusi Formation shale in Deyang-Anyue rift trough of Sichuan Basin, China, and its comparison with the Wufeng-Longmaxi Formation shale DOI
Jianfa Wu, Wenbin Jiang, Chao Luo

et al.

Fuel, Journal Year: 2025, Volume and Issue: 393, P. 134976 - 134976

Published: March 7, 2025

Language: Английский

Citations

0
Origin of chemical structure and pore heterogeneity of over-matured organic matter in the Paleozoic marine shales, China DOI

Yingzhu Wang,

Jijin Yang

International Journal of Coal Geology, Journal Year: 2025, Volume and Issue: 303, P. 104742 - 104742

Published: March 5, 2025

Language: Английский

Citations

0
The shale gas migration capacity of the Qiongzhusi Formation: Implications for its enrichment model DOI
Huan Miao, Zhenxue Jiang, Xun Gong

et al.

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(5)

Published: May 1, 2025

As the exploration of deep and ultra-deep shale gas advances, traditional static enrichment factors inadequately explain processes in these formations. It is essential to consider dynamic adjustments reservoirs that are influenced by migration. The Qiongzhusi Formation represents a notable progression from Longmaxi Formation; however, research on its mechanisms largely remains static. Focusing ⑤ ⑥ layers Sichuan Basin, we employed various analytical techniques—total organic carbon analysis, x-ray diffraction, porosity testing, high-pressure mercury intrusion, low-pressure N2 adsorption, low-temperature CO2 adsorption—to evaluate migration capabilities within Deyang–Anyue rift trough surroundings. Pores support transitional flow comprise largest fraction (50.04%–64.24%), followed those facilitate slip (29.28%–43.36%). Although fewer pores accommodating Darcy crucial for layer exhibits higher hydrocarbon generation potential ability than layer, rendering it more gas-rich. Given lower capability at edge compared exterior, both Additionally, content differs significantly between trough. greatest exists outside trough, where sealing over comparatively weaker. Therefore, difference minimized layers. Consequently, development efforts silty should prioritize exterior regions

Language: Английский

Citations

0
Pore development characteristics and controlling factors of Lower Cambrian Qiongzhusi shale gas reservoir in Sichuan Basin, China DOI Creative Commons

Zi-Nuo Zhang,

Miruo Lin,

Kelai Xi

et al.

Unconventional Resources, Journal Year: 2024, Volume and Issue: 4, P. 100100 - 100100

Published: Jan. 1, 2024

Recently, the shale gas exploration of Lower Cambrian Qiongzhusi Formation in Sichuan Basin has made a great breakthrough. However, pore characteristics and controlling factors shale-gas reservoir are not clear, which hinders further development gas. This paper focuses on Basin. On basis mineral composition lithofacies types reservoirs were classified by microscopic observation. Additionally, focused ion beam-scanning electron microscope (FIB-SEM), advanced identification characterization system (AMICS) analysis, large-field stitching scanning technology (MAPS) nitrogen adsorption experiment employed to comprehensively determine differential development. The results indicate that mainly composed interparticle pores intercrystalline pores. structure is complex. Significant differences parameters observed among different lithofacies. Quartz feldspar contribute preservation primary due their strong compressive resistance. Clay minerals carbonate impede occluding influence organic matter relatively small. According parameters, laminated favorable facies types.

Language: Английский

Citations

1
Using benzonaphthothiophenes to trace paleo-oil migration directions in the Ediacaran-Cambrian reservoirs of the central Sichuan Basin DOI

Zhi Chai,

Zhonghong Chen, Moïse Luemba

et al.

Applied Geochemistry, Journal Year: 2024, Volume and Issue: unknown, P. 106189 - 106189

Published: Sept. 1, 2024

Language: Английский

Citations

1
Characteristics and Paleoenvironment of the Niutitang Shale Reservoir in the Zhenba Area DOI Open Access

Tao Tian,

Wei Chang, Pei Zhang

et al.

Processes, Journal Year: 2024, Volume and Issue: 12(11), P. 2595 - 2595

Published: Nov. 18, 2024

The lack of in-depth analysis on the reservoir characteristics and paleoenvironmental conditions Niutitang Formation in study area has led to an unclear understanding its geological background. In this study, core samples from well SZY1 were selected, X-ray diffraction (XRD), scanning electron microscopy (SEM), quantitative elemental employed systematically investigate properties paleoenvironment shales. results indicate that shales form a low-porosity, low-permeability reservoir. By utilizing indicators such as chemical index alteration (CIA) ratios, delves into paleoclimate paleoproductivity region. (La/Yb)n ratio is approximately 1, indicating rapid deposition rate beneficial for accumulation preservation organic matter. chondrite-normalized North American Shale Composite (NASC)-normalized rare earth element (REE) distribution patterns show consistent trends with minimal variation, reflecting presence mixed sources sediments area. Analysis reveals are enriched light rare-earth elements (LREEs) negative europium anomaly, primary source rocks sedimentary granitic, located far areas seafloor hydrothermal activity. NiEF CuEF values suggest high paleoproductivity, deposited anoxic-reducing environment. depositional environments Marcellus Utica United States, Wufeng-Longmaxi black Changning Sichuan Basin, similar, characterized by anoxic reducing well-developed fractures. thermal evolution degree relatively moderate, currently peak gas generation stage, quality rated medium high, good potential hydrocarbon promising exploration prospects.

Language: Английский

Citations

0