{"title":"利用一维/二维核磁共振和离心技术对中国近海地区湖相页岩的石油成因和流动性进行实验研究","authors":"","doi":"10.1016/j.coal.2024.104618","DOIUrl":null,"url":null,"abstract":"<div><div>Shale oil occurrence mechanism and mobility have significant influences on hydrocarbons extraction from shale systems. However, the effects of petrophysical and petroleum geochemical properties on oil mobility are not understood. In this study, shales with different lithofacies were investigated using thin sections, scanning electron microscopy, nuclear magnetic resonance (NMR), and organic geochemical analysis. Shales at original, extracted, oil-saturated, and centrifugal states were systematically scanned using 1D and 2D NMR technologies. The multi-scaled pores were obtained by comparing the T<sub>2</sub> spectra of samples at different states. The 2D NMR identification spectra for hydrocarbon-bearing components were established. The free oil, adsorbed oil, mobile oil contents were quantitatively evaluated and the geological controls on oil mobility were discussed.</div><div>Results show that the siliceous shales have the highest total oil and movable oil contents, while the argillaceous shales have the lowest values due to the limited pore space and poor connectivity. Mobile oil mainly stores in interparticle pores, dissolution-related pores and bedding fractures. Its content increases with the increasing felsic minerals. Oil in siliceous shales are rich in low carbon-chain hydrocarbons and has high mobility. Based on oil distribution in multi-scaled pores, a strategy about the mobile oil distribution were proposed: Ultramicropores region is the immobile oil zone; Micropores region is the oil difficult-to-flow zone; Transition pores region is the oil easy-to-flow zone; Macropores region is the completely mobile oil zone. The mobile oil mainly accommodates in transition pores and macropores (pore size >20 nm and mobile oil saturation exceeds 60 %).</div></div>","PeriodicalId":13864,"journal":{"name":"International Journal of Coal Geology","volume":null,"pages":null},"PeriodicalIF":5.6000,"publicationDate":"2024-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Experimental investigation on the oil occurrence and mobility of lacustrine shales in offshore area of China using 1D/2D nuclear magnetic resonance and centrifugal techniques\",\"authors\":\"\",\"doi\":\"10.1016/j.coal.2024.104618\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Shale oil occurrence mechanism and mobility have significant influences on hydrocarbons extraction from shale systems. However, the effects of petrophysical and petroleum geochemical properties on oil mobility are not understood. In this study, shales with different lithofacies were investigated using thin sections, scanning electron microscopy, nuclear magnetic resonance (NMR), and organic geochemical analysis. Shales at original, extracted, oil-saturated, and centrifugal states were systematically scanned using 1D and 2D NMR technologies. The multi-scaled pores were obtained by comparing the T<sub>2</sub> spectra of samples at different states. The 2D NMR identification spectra for hydrocarbon-bearing components were established. The free oil, adsorbed oil, mobile oil contents were quantitatively evaluated and the geological controls on oil mobility were discussed.</div><div>Results show that the siliceous shales have the highest total oil and movable oil contents, while the argillaceous shales have the lowest values due to the limited pore space and poor connectivity. Mobile oil mainly stores in interparticle pores, dissolution-related pores and bedding fractures. Its content increases with the increasing felsic minerals. Oil in siliceous shales are rich in low carbon-chain hydrocarbons and has high mobility. Based on oil distribution in multi-scaled pores, a strategy about the mobile oil distribution were proposed: Ultramicropores region is the immobile oil zone; Micropores region is the oil difficult-to-flow zone; Transition pores region is the oil easy-to-flow zone; Macropores region is the completely mobile oil zone. The mobile oil mainly accommodates in transition pores and macropores (pore size >20 nm and mobile oil saturation exceeds 60 %).</div></div>\",\"PeriodicalId\":13864,\"journal\":{\"name\":\"International Journal of Coal Geology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.6000,\"publicationDate\":\"2024-10-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Coal Geology\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0166516224001757\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENERGY & FUELS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Coal Geology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0166516224001757","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
Experimental investigation on the oil occurrence and mobility of lacustrine shales in offshore area of China using 1D/2D nuclear magnetic resonance and centrifugal techniques
Shale oil occurrence mechanism and mobility have significant influences on hydrocarbons extraction from shale systems. However, the effects of petrophysical and petroleum geochemical properties on oil mobility are not understood. In this study, shales with different lithofacies were investigated using thin sections, scanning electron microscopy, nuclear magnetic resonance (NMR), and organic geochemical analysis. Shales at original, extracted, oil-saturated, and centrifugal states were systematically scanned using 1D and 2D NMR technologies. The multi-scaled pores were obtained by comparing the T2 spectra of samples at different states. The 2D NMR identification spectra for hydrocarbon-bearing components were established. The free oil, adsorbed oil, mobile oil contents were quantitatively evaluated and the geological controls on oil mobility were discussed.
Results show that the siliceous shales have the highest total oil and movable oil contents, while the argillaceous shales have the lowest values due to the limited pore space and poor connectivity. Mobile oil mainly stores in interparticle pores, dissolution-related pores and bedding fractures. Its content increases with the increasing felsic minerals. Oil in siliceous shales are rich in low carbon-chain hydrocarbons and has high mobility. Based on oil distribution in multi-scaled pores, a strategy about the mobile oil distribution were proposed: Ultramicropores region is the immobile oil zone; Micropores region is the oil difficult-to-flow zone; Transition pores region is the oil easy-to-flow zone; Macropores region is the completely mobile oil zone. The mobile oil mainly accommodates in transition pores and macropores (pore size >20 nm and mobile oil saturation exceeds 60 %).
期刊介绍:
The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.