Prediction of organic carbon content in oil shale based on logging: a case study in the Songliao Basin, Northeast China

Wang, Junxian; Xu, Yinbo; Sun, Pingchang; Liu, Zhaojun; Zhang, Jiaqiang; Meng, Qingtao; Zhang, Penglin; Tang, Baiqiang

doi:10.1007/s40948-022-00355-9

Cited by 8 publications

(6 citation statements)

References 55 publications

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“…The study area (Dachanggou Basin) is located in the northern Xinjiang Uygur Autonomous Region, and its tectonic orientation is part of the Tangbala Karamaili Paleozoic composite trench-arc belt on the Junggar microplate that is part of the Kazakhstan plate (Figure a). − The basin is surrounded by Meso-Cenozoic basins, such as the Santanghu Basin, Junggar Basin, Balikun Basin, and Turpan Hami Basin (Figure b). These basins in northern Xinjiang have had similar geological evolution histories since the Mesozoic, so they have the same stratigraphic division system − The study horizon is the Early Jurassic Badaowan Formation.…”

Section: Geological Settingmentioning

confidence: 99%

Characteristics, Genesis, and Hydrocarbon Aspects of Lacustrine Siderite-Rich Marl (Early Jurassic): A Case Study in the Dachanggou Basin, Xinjiang, Northwest China

Bai

Wang

Liu

2023

ACS Earth Space Chem.

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Thinly bedded marls are widely developed in the oil shalebearing series of the Lower Jurassic Badaowan Formation in the Dachanggou Basin (Northwest China). In this study, the characteristics, genesis, and hydrocarbon prospects of marls in a lacustrine organic-rich shale series were analyzed via X-ray diffractometry, element geochemistry, carbon and oxygen isotope analysis, total organic carbon content analysis, rock pyrolysis, and sedimentary analysis. The results show that the main carbonate component of marl is siderite, which is mainly present in areas with lithologic changes at the top and bottom of organic shale, and that the development of a thick siderite-rich marl is closely related to the presence of the thick oil shale. The elemental indicators of the sedimentary environment show that the low initial organic matter abundance and low clastic input were conducive to the formation of siderite and that the water body in the marl development period provided an oxic−suboxic environment, although the formation of siderite was still disturbed by oxygen in the relatively reduced bottom sediments. The carbonate carbon isotopes in the marl are clearly positive, indicating that δ 13 C-rich carbonate provided by methanogens decomposing sedimentary organic matter contributed to the siderite formation. These siderite-rich marls formed in a relatively restricted environment; i.e., they were deposited close to a rich organic layer, with a sufficient methanogenic metabolite CO 2 content and a small amount of terrigenous clastic input. These factors reached an appropriate balance, thus forming a narrow zone (partial shallow lake and delta front facies). Although the hydrocarbon generation potential of the marl is low relative to that of other source rocks, the thin marl that is widespread in continental shallow-water organic-rich sedimentary systems can improve the fracturing ability of shale reservoirs, which is of far-reaching significance for the development of shale oil and gas in continental shallow-water sedimentary systems.

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Section: Geological Settingmentioning

confidence: 99%

Characteristics, Genesis, and Hydrocarbon Aspects of Lacustrine Siderite-Rich Marl (Early Jurassic): A Case Study in the Dachanggou Basin, Xinjiang, Northwest China

Bai

Wang

Liu

2023

ACS Earth Space Chem.

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“…Lake sediments are the best carriers of natural ecosystems such as terrestrial hydrological systems and vegetation evolution. − However, how to extract credible hydrological information from lake sediments, especially lake level information, is the focus of lake research. Researchers’ research on lake levels of lake land lakes mainly focuses on biomarkers (such as calcium algae, benthic foraminifera and planktonic foraminifera, coral communities, and ostracods) and geochemistry (such as U/Th, V/Cr, and Ni/Co values). − The above data provide a theoretical and data basis for the restoration of lake levels, and a large number of high-level research results have been achieved. − However, when the lake level recovery is carried out for the sedimentary strata of the oil and gas basins in the non-field outcrop area, the above methods are generally highly dependent on the core (physical sample), so it is difficult to carry out the continuous recovery of a set of strata, which greatly limits the research and application of lake levels. − For this reason, many researchers use INPEFA and Dynamic noise after orbital tuning (DYNOT) technology to carry out special mathematical processing of conventional logging data, extract the hidden lake level in the original logging curve, and determine the change of ancient lake level by analyzing the trend form and inflection point type of different levels of INPEFA and DYNOT curves. − INPEFA and DYNOT technology provides new ideas and methods for lake level research.…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, many researchers have proposed logging prediction methods for TOC content, such as Δlog R , linear regression model, and artificial neural network. They mostly use basic logging curves such as resistivity, density, γ ray, and acoustic, which are effective in practical applications. ,− …”

Section: Introductionmentioning

confidence: 99%

“…Lake sediments are the best carriers of natural ecosystems such as terrestrial hydrological systems and vegetation evolution. 1 − 3 However, how to extract credible hydrological information from lake sediments, especially lake level information, is the focus of lake research. Researchers’ research on lake levels of lake land lakes mainly focuses on biomarkers (such as calcium algae, benthic foraminifera and planktonic foraminifera, coral communities, and ostracods) and geochemistry (such as U/Th, V/Cr, and Ni/Co values).…”

Section: Introductionmentioning

confidence: 99%

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Eocene Statistics of the Semi-Deep–Deep Lake-Level Evolution of the Jijuntun Formation in the Fushun Basin, Northeast China

Shao

Zhang

et al. 2023

ACS Omega

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The fluctuation of lake levels in semi-deep and deep lake environments has long been a central topic in the study of ancient lake evolution. This phenomenon has a significant impact on the enrichment of organic matter and the overall ecosystem. The study of lake-level changes in deep lake environments is hindered by the scarcity of records in continental strata. To address this issue, we conducted a study on the Eocene Jijuntun Formation in Fushun Basin, specifically focusing on the LFD-1 well. Our study involved finely sampling the extremely thick oil shale (about 80 m), which was deposited in the semi-deep to deep lake environment of the Jijuntun Formation. The TOC was predicted by multiple methods, and the lake level study was restored by combining logging INPEFA and Dynamic noise after orbital tuning (DYNOT) techniques. The oil shale of the target layer is type I kerogen, and the source of organic matter is basically the same. The γ ray (GR), resistivity (RT), acoustic (AC), and density (DEN) logging curves are in the normal distribution, indicating that the logging data are better. The accuracy of TOC simulated by improved Δlog R, SVR, and XGBoost models is affected by the number of sample sets. The improved Δlog R model is most affected by the change of sample size, followed by the SVR model, and the XGBoost model is the most stable. In addition, compared with the prediction accuracy of TOC by improved Δlog R, SVR, and XGBoost models, it is shown that the improved Δlog R method has limitations in the prediction of TOC in oil shale. The SVR model is more suitable for the prediction of oil shale resources with small sample size, and the XGBoost model is applicable when the sample size is relatively large. According to the DYNOT analysis of logging INPEFA and TOC, the lake level changes frequently during the deposition of ultra-thick oil shale, and the lake level has experienced five stages of rising–stabilizing–frequent fluctuation–stabilizing– decreasing. The research results provide a theoretical basis for revealing the plane change of stable deep lake lakes and provide a basis for the study of lake levels in faulted lake basins in Paleogene Northeast Asia.

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“…Organic-rich fine-grained sedimentary rocks are closely related to regional climate evolution and can even correspond to global climate events. − The thick coal deposits in the Fushun Basin provide a good opportunity for studying element enrichment, occurrence forms, and influencing factors in coal seams. Many researchers have conducted detailed studies on the source of organic matter, sedimentary environment, and extreme climate of coal seams in the Fushun Basin, providing a preliminary basis for this study. − However, only few studies have investigated element enrichment, occurrence forms, and sources of coal seams in the Fushun Basin.…”

Section: Introductionmentioning

confidence: 99%

Occurrence Patterns and Enrichment Influencing Factors of Trace Elements in Paleogene Coal in the Fushun Basin, China

Zhang

Wei

Zhang

et al. 2022

ACS Earth Space Chem.

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The occurrence forms of trace elements in coal are of great significance for the clean utilization, abnormal enrichment, and recovery of beneficial elements in coal. The Fushun Basin in Northeast China has thick coal deposits which provide a good opportunity for studying their geochemistry. This study aims to estimate the element enrichment of Paleogene coal seams and their influencing factors during deposition based on statistical and geochemical analyses. Compared with world hard coals, coals in the Fushun Basin feature enrichment of Ga and Sb (CC > 5), slight enrichment of V, Cr, Co, Ni, As, Rb, Zr, Nb, and Cd (2 < CC < 5), and depletion of B, Tl, Bl, and U (CC < 0.5). The CC values of the remaining elements (0.5 < CC < 2) are close to the average values for world hard coals. The main carriers of Ga, Co, Rb, Mo, As, Se, Pb, V, and Li are potassium, iron, and sulfate minerals and those of Cd, Cr, Ni, Sb, Th, Sn, U, Hf, Zr, Cs, Ta, and Nb are clay minerals. The CIA, Sr/Cu, Rb/Sr, and Ga/Rb values suggest that the studied coal seam formed under humid/warm climatic conditions. The coal seam is mainly derived from intermediate source rocks and sandstone or mudstone source rocks which were exposed to intensive chemical weathering and deposited in a freshwater setting. Additionally, paleoweathering, paleoclimate, detrital input, and provenance all contributed to the enrichment of geochemical elements in the studied Paleogene coal. The results of this study are preliminary, and the authors will continue to conduct mineralogical analysis.

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Prediction of organic carbon content in oil shale based on logging: a case study in the Songliao Basin, Northeast China

Cited by 8 publications

References 55 publications

Characteristics, Genesis, and Hydrocarbon Aspects of Lacustrine Siderite-Rich Marl (Early Jurassic): A Case Study in the Dachanggou Basin, Xinjiang, Northwest China

Characteristics, Genesis, and Hydrocarbon Aspects of Lacustrine Siderite-Rich Marl (Early Jurassic): A Case Study in the Dachanggou Basin, Xinjiang, Northwest China

Eocene Statistics of the Semi-Deep–Deep Lake-Level Evolution of the Jijuntun Formation in the Fushun Basin, Northeast China

Occurrence Patterns and Enrichment Influencing Factors of Trace Elements in Paleogene Coal in the Fushun Basin, China

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