Geochemistry and accumulation of petroleum in deep lacustrine reservoirs: A case study of Dongying Depression, Bohai Bay Basin

Qiao, Rongzhen; Chen, Zhonghong; Li, Chenyi; Wang, Dongye; Gao, Yang; Zhao, Lanquan; Li, Youqiang; Liu, Jinyou

doi:10.1016/j.petrol.2022.110433

Cited by 10 publications

(3 citation statements)

References 79 publications

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“…Moreover, it assists with the successful transformation from oil shale and fractured shale reservoir to a mature matrix-type (Zhao et al, 2020). For this process, there are many great large-scale reserves in the Ordos Basin (Fu et al, 2021;Li et al, 2022), Songliao Basin (Jin et al, 2022), Sichuan Basin, and Junggar Basin (Jin et al, 2022), as well as some national shale oil demonstration areas that are being built in Longdong, Gulong, Jimsar, and Jiyang (Qiao et al, 2022).…”

Section: Practice Of Key Zonesmentioning

confidence: 99%

Characteristics, current exploration practices, and prospects of continental shale oil in China

Wang

Li²,

Jiang

et al. 2022

Adv. Geo-Energy Res.

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Oil generation in the continental shale has laid the resource foundation for the originality and development of China's petroleum industry; continental shale oil production is blazing a new trail in this field. In this paper, based on the geological conditions of continental shale oil in China, it is found that the main types of shale oil generally have four basic geological characteristics, which are large-scale continuous distribution, the domination of inorganic pores, the enrichment of "sweet areas", and initial production that is controlled by relatively high organic maturity and high yield that is governed by relatively high formation pressure. Then, as examples for the geological characteristics and development practice of continental shale oil, four key areas of Longdong, Gulong, Jimsar, and Jiyang are systematically summarized. Finally, the future prospects of continental shale oil in China are put forward. Middle-high maturity shale oil is currently the main force of development, and middle-low maturity shale oil also has a considerable development prospect after technological improvement. Meanwhile, "sweet area/spot sections" assessment and technological innovation are still research areas to be improved.

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Section: Practice Of Key Zonesmentioning

confidence: 99%

Characteristics, current exploration practices, and prospects of continental shale oil in China

Wang

Li²,

Jiang

et al. 2022

Adv. Geo-Energy Res.

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“…The Dongying Sag is a subtectonic unit within the Jiyang Depression of the Bohai Bay Basin and is one of the most productive oil- and gas-producing areas in eastern China. − The sag is rich in hydrocarbon resources and has a full range of reservoir types, but the extent of hydrocarbon discovery within the depression varies widely in space. After about 60 years of oil and gas exploration and development, dozens of oil fields have been built in the Dongying Sag, with a cumulative proven oil geological reserve of over 2.5 billion tonnes. , Oil found in the Archean, Paleozoic, Mesozoic, and Cenozoic reservoirs exhibits great variation in physical properties such as crude oil density, viscosity, wax content, freezing point, etc. , In the past, a lot of work has been carried out on the formation and accumulation of oil and gas in the Dongying Sag, and the development characteristics of source rocks, , the types and sources of oil and gas, , and the migration and accumulation process of oil and gas have been fully recognized and determined. − However, the physical properties of crude oils, especially the freezing point characteristics of crude oils, the spatial distribution characteristics of crude oils with different freezing points, and the geological reasons for the formation of such characteristics, have not been thoroughly analyzed. The aim of this study is to determine the spatial variation characteristics of the freezing point of crude oils in the Dongying Sag and the distribution pattern of high-freezing-point crude oils.…”

Section: Introductionmentioning

confidence: 99%

“…21 , 22 Oil found in the Archean, Paleozoic, Mesozoic, and Cenozoic reservoirs exhibits great variation in physical properties such as crude oil density, viscosity, wax content, freezing point, etc. 23 , 24 In the past, a lot of work has been carried out on the formation and accumulation of oil and gas in the Dongying Sag, and the development characteristics of source rocks, 25 , 26 the types and sources of oil and gas, 27 , 28 and the migration and accumulation process of oil and gas have been fully recognized and determined. 29 − 31 However, the physical properties of crude oils, especially the freezing point characteristics of crude oils, the spatial distribution characteristics of crude oils with different freezing points, and the geological reasons for the formation of such characteristics, have not been thoroughly analyzed.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Spatial Distribution Characteristics of Crude Oils with Different Freezing Points and the Genetic Mechanism of High-Freezing-Point Crude Oils in the Dongying Sag

Niu,

Wang,

et al. 2023

ACS Omega

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The freezing point of crude oils is an important factor affecting the process of exploration, development, and transportation of crude oils. In the Dongying Sag, the freezing point of crude oils varies greatly in space, and high-freezing-point crude oils have been found in many structural belts. The freezing point of crude oils in the Dongying Sag is generally high, ranging from −40 to 80 °C. The distribution of high-freezing-point crude oils in the Dongying Sag is scattered, and they have been found at different depths, layers, and structural belts, with relatively more occurrences in specific areas. Based on the relationship between the wax content and the resin + asphaltene content, the high-freezing-point crude oils in the Dongying Sag can be classified into three types (type A, type B, and type C). Type A, type B, and type C high-freezing-point crude oils are mainly found in the gentle slope zone, depression zone, and uplift zone, respectively. The contents of wax and resins + asphaltenes in crude oils are the key factors controlling the freezing point of crude oils in the Dongying Sag. Oil source correlation using biomarkers and n -alkane carbon isotopes demonstrates that different types of high-freezing-point crude oils are generated from different source rocks, indicating that the source of crude oils is not the only factor controlling the freezing point of crude oils. The hydrocarbon-generating parent material of hydrocarbon source rocks developed in different depositional environments of the Dongying Sag is generally characterized by the dominance of bacteria and algae and is supplemented by terrestrial higher plants. This lays the material foundation for the formation of waxes during the maturation of hydrocarbon source rocks. The change of temperature and pressure conditions during the process of oil expulsion from source rocks and migration in the carrier bed will lead to phase fractionation and composition changes of oils, thus forming type A freezing point crude oils in the slope zone and type B freezing point oils in the depression zone. The increase in resin and asphaltene content caused by biodegradation and water washing in shallower buried oil reservoirs is the reason for the formation of type C high-freezing-point crude oils. The research results indicate that the organic matter composition and hydrocarbon alteration during migration and accumulation jointly control the formation of high-freezing-point crude oils in lacustrine basins. The extensive input of terrestrial organic matter into the source rocks of the lacustrine basin laid the foundation for the formation of high-freezing-point crude oils, and the migration fractionation and biodegradation of the crude oils further promoted the formation of high-freezing-point crude oils.

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Petroleum phase evolution at high temperature: A combined study of oil cracking experiment and deep oil in Dongying Depression, eastern China

Qiao

Chen

2022

Fuel

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Geochemistry and accumulation of petroleum in deep lacustrine reservoirs: A case study of Dongying Depression, Bohai Bay Basin

Cited by 10 publications

References 79 publications

Characteristics, current exploration practices, and prospects of continental shale oil in China

Characteristics, current exploration practices, and prospects of continental shale oil in China

Analysis of the Spatial Distribution Characteristics of Crude Oils with Different Freezing Points and the Genetic Mechanism of High-Freezing-Point Crude Oils in the Dongying Sag

Petroleum phase evolution at high temperature: A combined study of oil cracking experiment and deep oil in Dongying Depression, eastern China

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