A revised method for reconstructing the hydrocarbon generation and expulsion history and evaluating the hydrocarbon resource potential: Example from the first member of the Qingshankou Formation in the Northern Songliao Basin, Northeast China

Li, Changrong; Pang, Xiongqi; Huo, Zhipeng; Wang, Enze; Xue, Nan

doi:10.1016/j.marpetgeo.2020.104577

Cited by 37 publications

(29 citation statements)

References 34 publications

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“…Based on the mass balance principle and the method of Chen and Jiang, 20 Li et al 22 proposed a hydrocarbon generation statistical method to fit the evolution of the hydrogen index (HI = S 2 /TOC × 100 refers to the residual hydrocarbon generation potential per gram of organic carbon) and the hydrocarbon generation index (Ig = (S 1 + S 2 )/TOC × 100 refers to the sum of residual hydrocarbon generation potential and the generated hydrocarbon amount of per gram of organic carbon) in the context of thermal maturity for a set of samples (the detailed formula derivation can be found in Appendix A of Li et al; 22 this method is used directly in this study). This method can quantify the hydrocarbon generation, expulsion, and retention capacity of a specific shale Fm with a certain number of samples ( Figure 3 ).…”

Section: Methodsmentioning

confidence: 99%

Mass Balance-Based Method for Quantifying the Oil Moveable Threshold and Oil Content Evaluation of Lacustrine Shale in the Paleogene Shahejie Formation, Nanpu Sag, Bohai Bay Basin

Wang

Yuan

et al. 2022

ACS Omega

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Substantial heterogeneity in lacustrine shale brings significant challenges to oil exploration. Therefore, a clear and effective resource evaluation standard can significantly reduce the exploration risk and cost, thus further guiding the prediction in productive areas. However, due to the lack of consideration of the thermal maturity and kerogen type, the present evaluation standards may result in the misjudgment of the resource quality of shale oil reservoirs. In this study, a method based on mass balance involving a hydrocarbon generation statistical model was proposed to calculate oil movable threshold (OMT) values. The OMT values for different types of kerogens are determined from simple and easily obtained pyrolysis parameters. Based on the OMT values, a three-dimensional resource quality evaluation model is constructed and applied to the source rocks in Member (Mbr) 1 of the Shahejie Formation (Fm) Nanpu Sag, Bohai Bay Basin, eastern China. The results show that the Mbr 1 of Shahejie Fm shale is a set of high-quality source rocks with high total organic matter (TOC) and S 1c (calibrated free hydrocarbons) content. Meanwhile, the hydrocarbon generation potential of the studied lacustrine shales are in the order of type I > type II 1 > type II 2 > type III, whereas the OMT values show a similar order. From type I to type III, the hydrocarbon expulsion threshold (HET) values for the four types of shales correspond to pyrolysis peak temperatures ( T max ) at 438, 426, 428, and 432 °C with the maximum OMT values being 143, 128, 127, and 122 mg HC/g TOC, respectively. The movable and favorable shale oil accumulations are mainly associated with type II 1 and II 2 shales. Our work provides a novel method for distinguishing the resource quality and locating a favorable exploration target for lacustrine shale, improving efficiency and reducing exploration risks.

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Section: Methodsmentioning

confidence: 99%

Mass Balance-Based Method for Quantifying the Oil Moveable Threshold and Oil Content Evaluation of Lacustrine Shale in the Paleogene Shahejie Formation, Nanpu Sag, Bohai Bay Basin

Wang

Yuan

et al. 2022

ACS Omega

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“…The hydrocarbon generation and expulsion model of source rocks in the E 2 w was established by using the improved hydrocarbon generation potential method (Li et al, 2020) (Fig. 8).…”

Section: Characteristicsmentioning

confidence: 99%

“…Based on the detailed analysis of the geological and geochemical characteristics of E 2 w source rocks in the Huizhou Depression, this study selected the improved hydrocarbon generation potential method to establish the hydrocarbon generation and expulsion model of source rocks (Li et al, 2020). Furthermore, by improving the restoration of original hydrocarbon generation potential of source rocks, the history of the hydrocarbon generation and expulsion of source rocks was revealed, and the potential of conventional, tight, and shale oil and gas resources were further evaluated based on the history of tight reservoir evolution.…”

Section: Introductionmentioning

confidence: 99%

Potential resources of conventional, tight, and shale oil and gas from Paleogene Wenchang Formation source rocks in the Huizhou Depression

et al. 2022

Adv. Geo-Energy Res.

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Conventional and tight unconventional oil and gas resources in the Huizhou Depression have shown broad exploration prospects, which mainly originate from Wenchang Formation source rocks. Thus far, studies on Wenchang Formation source rocks mainly focused on the geochemical characteristics and conventional petroleum resource evaluation; however, the correlation of conventional, tight, and shale oil and gas, and their resources are still unknown. In fact, the formation of conventional, tight, and shale oil and gas are intrinsically related, which allows for a more objective evaluation to consider the three types of oil and gas resources simultaneously in the whole dynamic process of both hydrocarbon generation and expulsion, as well as reservoir tightness history. In this work, based on geological and geochemical analyses, the improved hydrocarbon generation potential method was utilized to establish a hydrocarbon generation and expulsion model of the Wenchang Formation source rocks. Then, combined with the reservoir tightness history, the conventional, tight, and shale oil and gas resources were evaluated. The results show that the Wenchang Formation source rocks are distributed in the whole depressions, with a thickness of 50-1850 m and an average total organic carbon content of 2.2%. The organic matter is mainly type II and is mature-high maturity. The Wenchang Formation source rocks reached hydrocarbon generation threshold and expulsion threshold at a vitrinite reflectivity of 0.43% and 0.65%, respectively, and the reservoir evolved completely tight at 2.3 Ma. Overall, the Lower and Upper Wenchang Formation contain a large amount of conventional, tight, and shale oil and gas resources.

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“…Based on the pyrolysis experiment and geological model, Hou et al (2017) found that the increase of the shale thickness during the oil generation stage would significantly reduce the oil expulsion efficiency. The thinner a single shale seam in a shale-FIGURE 6 | (A) Relationship between oil content and TOC of organic-rich shale (data from Wang M. et al, 2015;Li X. N. et al, 2017;Hu et al, 2018;Xu et al, 2019;Li C. R. et al, 2020). (B) relationship between lamina development and oil expulsion rate (modified from Wang Y. et al, 2016) (C) relationship between oil content and pore volume (modified from Zhao X.…”

Section: Influences Of Shale Thickness and Preservation Conditions 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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A revised method for reconstructing the hydrocarbon generation and expulsion history and evaluating the hydrocarbon resource potential: Example from the first member of the Qingshankou Formation in the Northern Songliao Basin, Northeast China

Cited by 37 publications

References 34 publications

Mass Balance-Based Method for Quantifying the Oil Moveable Threshold and Oil Content Evaluation of Lacustrine Shale in the Paleogene Shahejie Formation, Nanpu Sag, Bohai Bay Basin

Mass Balance-Based Method for Quantifying the Oil Moveable Threshold and Oil Content Evaluation of Lacustrine Shale in the Paleogene Shahejie Formation, Nanpu Sag, Bohai Bay Basin

Potential resources of conventional, tight, and shale oil and gas from Paleogene Wenchang Formation source rocks in the Huizhou Depression

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

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