Occurrence state and oil content evaluation of Permian Fengcheng Formation in the Hashan area as constrained by NMR and multistage Rock-Eval

Wang, Yue; Chang, Xiangchun; Liu, Zhong‐Quan; Zhang, Pengfei; Gao, Weizheng; Zeng, Zhiping; Li, Guisheng

doi:10.1016/j.petsci.2022.11.019

Cited by 3 publications

(3 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(5) The core was kept in the core holder and the ISCO displacement pump was used to inject CO 2 to the designed pressure (20/30/40 MPa). Then, the inlet and outlet valves of the core holder were closed and soaked for 4 h. (6) The outlet valve of the core holder was 46,47 The expression is shown in eq 1…”

Section: Comentioning

confidence: 99%

“…Shale oil, with its substantial reserves and considerable exploitative potential, has assumed a prominent role in this landscape. However, shale oil exists in shale matrix pores, microfractures, and thin interlayers of nonsource rocks in the form of mutual dissolution or adsorption of free shale oil and organic kerogen. − The reservoir’s characteristics include low porosity, low permeability, and strong heterogeneity, leading to great difficulty in development. Shale oil is typically developed through horizontal wells with volumetric hydraulic fracturing, but there are problems, such as rapid production decline and low recovery after a period of production.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Insights into Enhancing Shale Oil Recovery Postfracturing with CO₂ Huff and Puff and Elastic Depletion Development Strategies

Li,

Huang,

Duan

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

After hydraulic fracturing, shale reservoirs often undergo rapid production declines during depleted development, resulting in a low cumulative production. CO 2 huff and puff emerges as a promising method to enhance shale oil recovery postfracturing. This study conducted independent experiments to investigate multistage depressurization elastic depletion development and the CO 2 huff and puff method in shale oil. The effects of injection pressure, temperature, fractures, and other parameters on the CO 2 huff and puff recovery were analyzed using nuclear magnetic resonance (NMR). The impact of the CO 2 huff and puff on crude oil in different pores was elucidated. The results show that the fluid mobility of the shale reservoir is poor, with the recovery rate of elastic depletion development being less than 10%. Conversely, a CO 2 huff and puff can enhance the recovery rate by up to 20%. The recovery rate of shale oil through a CO 2 huff and puff correlates positively with injection pressure and temperature. The initial cycle of huff and puff contributes the most to crude oil recovery, reaching up to 50%. Under equivalent parameter conditions, the presence of fractures can increase the CO 2 huff and puff efficiency by 20% compared to the matrix core. Combined with NMR experiments, the lower limit of pores that oil can be produce in matrix and fracture cores in elastic depletion development is 200 and 150 nm, respectively. In the context of CO 2 huff and puff development, these values decrease to 30 nm for matrix cores and 15 nm for fractured cores.

show abstract

Section: Comentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Insights into Enhancing Shale Oil Recovery Postfracturing with CO₂ Huff and Puff and Elastic Depletion Development Strategies

Li,

Huang,

Duan

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…The oil content of shale is a pivotal parameter for assessing shale oil resources, estimating reserves, and making informed decisions on favorable development areas. − Rock pyrolysis assesses source rocks and is known for its convenience, speed, and information-rich results. , A pyrolysis parameter S 1 is widely utilized for evaluating oil contents and occurrence states (free hydrocarbons) in shales. , However, samples analyzed using rock pyrolysis methods are sometimes specimens drilled from underground and exposed to laboratory conditions upon reaching the surface. In comparison to in situ shale, changes in temperature, pressure, and longer exposure times can lead to significant evaporation of light hydrocarbon components from the shale. − Concurrently, rock pyrolysis parameters also exhibit phenomena of heavy hydrocarbon losses. − The light hydrocarbon portion lost from shale represents oil resources that are prioritized for extraction.…”

Section: Introductionmentioning

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

View full text Add to dashboard Cite

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.

show abstract

Organic geochemical and petrographic characteristics of the Cambrian-Ordovician organic-rich marine shales in Scandinavia

Zheng¹,

Schovsbo²,

Bian³

et al. 2023

Petroleum Science

View full text Add to dashboard Cite

Occurrence state and oil content evaluation of Permian Fengcheng Formation in the Hashan area as constrained by NMR and multistage Rock-Eval

Cited by 3 publications

References 39 publications

Insights into Enhancing Shale Oil Recovery Postfracturing with CO₂ Huff and Puff and Elastic Depletion Development Strategies

Insights into Enhancing Shale Oil Recovery Postfracturing with CO₂ Huff and Puff and Elastic Depletion Development Strategies

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

Organic geochemical and petrographic characteristics of the Cambrian-Ordovician organic-rich marine shales in Scandinavia

Contact Info

Product

Resources

About

Occurrence state and oil content evaluation of Permian Fengcheng Formation in the Hashan area as constrained by NMR and multistage Rock-Eval

Cited by 3 publications

References 39 publications

Insights into Enhancing Shale Oil Recovery Postfracturing with CO2 Huff and Puff and Elastic Depletion Development Strategies

Insights into Enhancing Shale Oil Recovery Postfracturing with CO2 Huff and Puff and Elastic Depletion Development Strategies

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

Organic geochemical and petrographic characteristics of the Cambrian-Ordovician organic-rich marine shales in Scandinavia

Contact Info

Product

Resources

About

Insights into Enhancing Shale Oil Recovery Postfracturing with CO₂ Huff and Puff and Elastic Depletion Development Strategies

Insights into Enhancing Shale Oil Recovery Postfracturing with CO₂ Huff and Puff and Elastic Depletion Development Strategies