An analysis of major scientific problems and research paths of Gulong shale oil in Daqing Oilfield, NE China

Sun, Li; Liu, He; He, Wen; Li, Guoxin; Zhang, Shuichang; Zhu, Rixiang; Xu, Jinkai; Meng, Siwei; Jiang, Hang

doi:10.1016/s1876-3804(21)60043-5

Cited by 143 publications

(72 citation statements)

References 18 publications

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“…In order to provide reliable results, we brought 10 core samples from one of the tight reservoirs located in Daqing field (one of the unconventional oilfields in China). More information about the sedimentology and lithology of this oilfield can be found in 13 . The properties of core samples are explained in Table 1 .…”

Section: Methodsmentioning

confidence: 99%

An experimental study to measure oil recovery factor by chemical agents and carbon dioxide after waterflooding

Yang

Bai

Song

et al. 2022

Sci Rep

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Development of tight formations would be one of the main priority for petroleum industries due to the enormous demand to the fossil fuels in various industries. In this paper, we provided a set of experiments on the generated foams by carbon dioxide (CO2) and nitrogen (N2), cyclic CO2 injection, water alternating gas injection (WAG), active carbonated water injection (coupling surfactant effects and carbonated water (CW)), and introducing the impact of active carbonated water alternating gas injection (combination of WAG and CW injection) after waterflooding. Carbon dioxide is more feasible than nitrogen, it can be mobilize more in the pore throats and provided higher oil recovery factor. Generated foam with CO2 has increased oil recovery factor about 32% while it’s about 28% for generated foam by N2. Moreover, according to the results of this study, the maximum oil recovery factor for active carbonated water alternating gas injection, active carbonated water injection, and water alternating gas injection measured 74%, 65%, and 48% respectively.

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Section: Methodsmentioning

confidence: 99%

An experimental study to measure oil recovery factor by chemical agents and carbon dioxide after waterflooding

Yang

Bai

Song

et al. 2022

Sci Rep

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“…In fact, with increasing pore size, pore volume and porosity, the oil content in shales usually increases (Wang et al, 2019b;Song et al, 2020;Wang B. Y. et al, 2021). Because the density of the generated oil and gas is lighter than that of kerogen, the volume expansion and the overpressure phenomenon occurs in shales, resulting in the generation of oil expulsion fractures (Sun L. D. et al, 2021). Although shale microfractures form effective oil migration channels and oil storage spaces, when the scale of microfractures reaches a certain extent, this may reduce the shale oil content.…”

Section: Control Of Toc Content Oil Storage Space and Mineral Composition On Oil Retentionmentioning

confidence: 99%

Oil Retention in Shales: A Review of the Mechanism, Controls and Assessment

et al. 2021

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Shale oil is a vital alternative energy source for oil and gas and has recently received an extensive attention. Characterization of the shale oil content provides an important guiding significance for resource potential evaluation, sweet spot prediction, and development of shale oil. In this paper, the mechanism, evaluation and influencing factors of oil retention in shales are reviewed. Oil is retained in shales through adsorption and swelling of kerogen, adsorption onto minerals and storage in shale pores. Quite a few methods are developed for oil content evaluation, such as three-dimensional fluorescence quantitation, two-dimensional nuclear magnetic resonance (2D NMR), solvent extraction, pyrolysis, multiple extraction-multiple pyrolysis-multiple chromatography, logging calculation, statistical regression, pyrolysis simulation experiment, and mass balance calculation. However, the limitations of these methods represent a challenge in practical applications. On this basis, the influencing factors of the oil retention are summarized from the microscale to the macroscale. The oil retention capacity is comprehensively controlled by organic matter abundance, type and maturity, mineral composition and diagenesis, oil storage space, shale thickness, and preservation conditions. Finally, oil mobility evaluation methods are introduced, mainly including the multitemperature pyrolysis, 2D NMR, and adsorption-swelling experiment, and the influencing factors of movable shale oil are briefly discussed. The aim of this paper is to deepen the understanding of shale oil evaluation and provide a basis for further research.

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“…Shale formations have become important targets of the unconventional oil and gas explorations worldwide. A typical representative is the Bakken shale, which is a marine medium–low mature shale with abundant shale oil resources that has contributed significantly to the U.S. petroleum industry. − Since the 1970s, inspired by the successful exploitation of the rich commercial oil deposits in North American marine shales, abundant shale oil has also been successfully exploited in the Bohai Bay, Ordos, Sichuan, and Songliao basins. − As a national reserve energy source, recently, domestic oil exploration and development efforts have continued to increase, and major strategic breakthroughs have been made in the GK (the first member of the Qingshankou Formation (K2qn 1 ), Gulong Sag) shale oil of the Songliao Basin. , The Gulong shale is a typical continental shale found in China. The K 2 qn 1 contains vast shale oil resources.…”

Section: Introductionmentioning

confidence: 99%

“…Compared to the North American marine facies enriched with shale oil and other domestic continental shales, the most significant feature of the K 2 qn 1 shale in the Gulong Sag is its high thermal maturity. The K 2 qn 1 shale is a medium–high maturity shale, and there is a big difference in its properties, such as mineral composition and oil content. , Since 2018, the Daqing Oil Field has deployed multiple vertical wells in the Gulong Sag and discovered a large number of flow streams in the K 2 qn 1 shale formation. Although all the wells produce oil, their productivities vary vastly, indicating that there are large differences in the shale reservoir space .…”

Section: Introductionmentioning

confidence: 99%

Pore Structure Characteristics and Affecting Factors of Shale in the First Member of the Qingshankou Formation in the Gulong Sag, Songliao Basin

Wang

et al. 2022

ACS Omega

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A major historical breakthrough has been made in the exploration of the GK (the first member of the Qingshankou Formation (K2qn 1 ), Gulong Sag) shale oil of the Songliao Basin. However, few reports have been reported on the pore structure characteristics of this large-scale lacustrine medium−high maturity shale. In addition, the difference between the pore structure characteristics of the GK shale and medium−low maturity marine/ continental shale is unknown, and the affecting factors of pore development are still unclear. Therefore, in order to clarify the pore structure characteristics of the GK shale and its affecting factors, this study characterized them experimentally and revealed the law of pore evolution using the mineral composition and geochemical analysis, microscopic observations, and pore quantification techniques. Results indicate that (1) the pore system of GK shale reservoirs is divided into micropores (pore diameter < 10 nm), mesopores (10 nm < pore diameter < 50 nm), and macropores (pore diameter > 50 nm); (2) the pore structure of the GK shale is mainly affected by the clay content, siliceous mineral content, and thermal maturity; and (3) when the content of clay minerals and siliceous minerals in the GK shale reservoir is high, and ∼0.8% < R o < ∼1.4%, the storage capacity and oil content of the GK shale show high values, and it can be considered as a strong candidate for further exploration and development. This research can push the shale oil revolution to a new height and is significant to promote the development of the petroleum industry.

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An analysis of major scientific problems and research paths of Gulong shale oil in Daqing Oilfield, NE China

Cited by 143 publications

References 18 publications

An experimental study to measure oil recovery factor by chemical agents and carbon dioxide after waterflooding

An experimental study to measure oil recovery factor by chemical agents and carbon dioxide after waterflooding

Oil Retention in Shales: A Review of the Mechanism, Controls and Assessment

Pore Structure Characteristics and Affecting Factors of Shale in the First Member of the Qingshankou Formation in the Gulong Sag, Songliao Basin

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