Gulong shale oil enrichment mechanism and orderly distribution of conventional– unconventional oils in the Cretaceous Qingshankou Formation, Songliao Basin, NE China

ZHANG, Shuichang; ZHANG, Bin; WANG, Xiaomei; FENG, Zihui; HE, Kun; WANG, Huajian; FU, Xiuli; LIU, Yuke; YANG, Chunlong

doi:10.1016/s1876-3804(23)60448-3

Cited by 12 publications

(4 citation statements)

References 34 publications

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“…thermal evolution degree of source rocks. [62] conducted pyrolytic analysis on the shale at the mature to the high-maturity stage in the Gulong Sag after extraction, and the pyrolysis Tmax value was between 440 and 490 °C, which is consistent with the measured Ro.…”

Section: Maturity Of Organic Matter 431 Vitrinite Reflectance (Ro)supporting

confidence: 74%

Geochemical Characteristics of Mature to High-Maturity Shale Resources, Occurrence State of Shale Oil, and Sweet Spot Evaluation in the Qingshankou Formation, Gulong Sag, Songliao Basin

Gao,

Feng,

Luo

et al. 2024

Energies

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The exploration of continental shale oil in China has made a breakthrough in many basins, but the pure shale type has only been found in the Qingshankou Formation, Gulong Sag, Songliao Basin, and the evaluation of shale oil occurrence and sweet spot faces great challenges. Using information about the total organic carbon (TOC), Rock-Eval pyrolysis, vitrinite reflectance (Ro), kerogen elemental composition, carbon isotopes, gas chromatography (GC), bitumen extraction, and component separation, this paper systematically studies the organic geochemical characteristics and shale oil occurrence at the Qingshankou Formation. The G1 well, which was cored through the entire section of the Qingshankou Formation in the Gulong Sag, was the object of this study. On this basis, the favorable sweet spots for shale oil exploration are predicted. It is concluded that the shale of the Qingshankou Formation has high organic heterogeneity in terms of organic matter features. The TOC content of the source rocks in the Qingshankou Formation is enhanced with the increase in the burial depth, and the corresponding organic matter types gradually changed from Ⅱ2 and Ⅱ1 types to the Ⅰ type. The distribution of Ro ranges from 1.09% to 1.67%, and it is the mature to high-mature evolution stage that generates a large amount of normal crude oil and gas condensate. The high-quality source rocks of good to excellent grade are mainly distributed in the Qing 1 member and the lower part of the Qing 2 member. After the recovery of light hydrocarbons and the correction of pyrolytic heavy soluble hydrocarbons, it is concluded that the occurrence state of shale oil in the Qingshankou Formation is mainly the free-state form, with an average value of 6.9 mg/g, and there is four times as much free oil as adsorbed oil. The oil saturation index (OSI), mobile hydrocarbon content, Ro, and TOC were selected to establish the geochemical evaluation criteria for shale oil sweet spots in the Qingshankou Formation. The evaluation results show that interval 3 and interval 5 of the Qingshankou Formation in the G1 well are the most favorable sections for shale oil exploration.

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Section: Maturity Of Organic Matter 431 Vitrinite Reflectance (Ro)supporting

confidence: 74%

Geochemical Characteristics of Mature to High-Maturity Shale Resources, Occurrence State of Shale Oil, and Sweet Spot Evaluation in the Qingshankou Formation, Gulong Sag, Songliao Basin

Gao,

Feng,

Luo

et al. 2024

Energies

Self Cite

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“…The Qingshankou Formation is deposited in a warm and humid reducing environment . The TOC distribution of shale ranges from 0.16% to 12.99% and is concentrated between 1.01% and 3.22%; the maximum hydrocarbon generation potential ( S 1 + S 2 ) can reach 29.27 mg/g, with an average value of approximately 4.86 mg/g. , The organic matter mainly comes from layered algae rich in lipid compounds, with the main types being Type I and II1. The hydrogen index is generally distributed between 600 and 800 mg/g.…”

Section: Geologic Settingmentioning

confidence: 99%

“…The Qingshankou Formation shale in the Songliao Basin is a set of high-quality source rocks with potent hydrocarbon generation, − and its oil indicators are extensive, as evidenced in the core samples across multiple wells. However, the Qingshankou Formation shale has undergone high thermal evolution, resulting in a higher content of volatile light components in the generated crude oil. , This leads to uncertainty when employing old sample S 1 to evaluate shale oil content, thereby hindering the accurate grasp of the resource potential and scale of shale oil, consequently encountering predicaments in strategic decisions about shale oil exploration and development.…”

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

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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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“…The Denglouku formation has a total of 28 faults that developed from the deposition period and continued until the deposition period of the Quantou formation and Qingshankou formation ended [30,31]. A total of nine faults developed in the Denglouku formation within the area of the depleted gas reservoir.…”

Section: Geologic and Tectonic Characteristics Of Depleted Gas Reserv...mentioning

confidence: 99%

Dynamic Evaluation of Sealing and Site Optimization for Underground Gas Storage in Depleted Gas Reserve: A Case Study

Zhuge,

Hong,

Wang

et al. 2023

Applied Sciences

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In the post-epidemic economic recovery background, under the influence of the international situation brought by the Russia-Ukraine conflict, the world is facing a significant rebound in total energy consumption. In order to seek a smooth transition for national energy low-carbon transformation, it is urgent that research be conducted on the trap dynamic sealing capacity evaluation and site optimization for underground storage in depleted gas reserves. Based on the geological data of Block S in Northeast China, combined with a dynamic acoustic test and a static triaxial test, a rock mechanical property model for wells is established, and the stress model of the underground storage in depleted gas reserves before construction is inverted. The sealing of the cap rock and faults in the underground gas storage is evaluated from both static and dynamic perspectives. The results show that the maximum horizontal principal stress of the cap rock and reservoir before construction is distributed between 48–76 MPa and 50–85 MPa, respectively. The reservoir of the Yingcheng Formation has strong stratigraphic mechanical strength and can be used as the main space for underground gas storage. The global cap rock shear safety factor is between 0.7–0.9, and the fault slip factor is only 0.1, indicating that this reservoir has strong dynamic closure sealing and is suitable for construction, thereby realizing the dynamic evaluation of sealing and site optimization for underground gas storage in a depleted gas reserve, providing a guarantee for the safe and stable operation of its subsequent expansion, multi-cycle injection, and production.

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Gulong shale oil enrichment mechanism and orderly distribution of conventional– unconventional oils in the Cretaceous Qingshankou Formation, Songliao Basin, NE China

Cited by 12 publications

References 34 publications

Geochemical Characteristics of Mature to High-Maturity Shale Resources, Occurrence State of Shale Oil, and Sweet Spot Evaluation in the Qingshankou Formation, Gulong Sag, Songliao Basin

Geochemical Characteristics of Mature to High-Maturity Shale Resources, Occurrence State of Shale Oil, and Sweet Spot Evaluation in the Qingshankou Formation, Gulong Sag, Songliao Basin

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

Dynamic Evaluation of Sealing and Site Optimization for Underground Gas Storage in Depleted Gas Reserve: A Case Study

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