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carbon isotope reversal of desorbed gas in Longmaxi shale of Jiaoshiba area,Sicuhan Basin

Petroleum Research 2017年第2期2卷 169-177页

作者： Hua Qin Xiaojun Fan Ming Liu Jingyu Hao Bo Liang Sinopec Exploration Branch Company Sichuan 610041China

Through analysis of components and carbon isotope compositions of gas desorbed from shale cores,the carbon isotope reversal phenomenon in the shale gas from the Silurian Longmaxi Formation of Jiaoshiba area in Sichuan Basin were well *** showed that compared with the wellhead gas,the desorbed gas from Longmaxi shale had significantly more wet components and more heavy carbon isotope values;carbon isotope values of each component became heavier with the desorption time,δ^(13)C_(1)values of different samples had maximum positive variations of 12.3-23.9‰,butδ^(13)C_(2)values only had maximum positive variations of 0.8e2.3‰,indicating carbon isotope values of methane changed more obviously than that of heavy *** above results were consistent with previous results of shale core desorption experiments carried out by other *** gas in strata might have no carbon isotope reversal,and the phenomenon thatδ^(13)C_(1)values changed more significantly thanδ^(13)C_(2)values during the core desorption was not caused by diffusion rate differences among different components,but mainly due to different desorption stages of methane and ethane,i.e.,the ethane was in its early desorption stage while the methane was in its later desorption stage;during the production process,phase differences among different components of alkane gas and differences in the desorption stages induced by adsorption,could be the major cause for total reversal of carbon isotopes of shale gas in Longmaxi Formation,but it also could not excluded that mixture of kerogen cracking gas and crude oil cracking gas probably had a partial or more major contribution to the carbon isotope reversal.

关键词： carbon isotope reversal Gas component Desorbed gas Shale gas Longmaxi Formation Jiaoshiba area

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carbon isotope evidence for shale gas preservation conditions and large methane release over million years:A case study of shale gas reservoirs of Wufeng and Longmaxi Formations in the Sichuan Basin

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Geoscience Frontiers 2023年第6期14卷 133-141页

作者： Haikuan Nie Chuanxiang Sun Pei Li Zhijun Jin Quanyou Liu Hanyong Bao Baojian Shen Wei Dang State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing 102206China Sinopec Key Laboratory of Shale Oil/Gas Exploration&Production Beijing 102206China Sinopec Petroleum Exploration and Production Research Institute Beijing 102206China Institute of Energy Peking UniversityBeijing 100871China Research Institute of Exploration and Development Jianghan Oilfield CompanySINOPECWuhan 430223China School of Earth Sciences and Engineering Xi’an Shiyou UniversityXi’an 710065China

Although carbon isotope reversal and its reasons in shale gas reservoirs have been widely recognized,the application of the reversal is yet to be investigated.A study on high-maturity shale from Wufeng and Longmaxi Formations in the Sichuan Basin not only reveals the relationship between the degree of isotopes inversion and the production capacity(e.g.,estimated ultimate recovery(EUR))of the gas well but also indicates the preservation conditions of shale gas reservoirs.(1)Although there are differences in gas isotopes in different shale gas reservoirs,the isotope fractionation of shale gas is small during the production stage of gas wells,even when the wellbore pressure drops to *** main cause of the difference in carbon isotopes and their inversion degree can be the uplift time during the Yanshan period and the formation pressure relief degree of shale gas reservoirs in distinct structural ***,carbon isotope inversion is a good indicator of shale gas preservation condition and EUR of shale gas wells.(2)The degree of carbon isotope inversion correlates strongly with shale gas content and *** calculation formula of shale-gas recoverable reserves was established using△δ^(13)C(δC_(1)-δC_(2))and EUR.(3)The gas loss rate and total loss amount can be estimated using the dynamic reserves and isotopic difference values of gas wells in various shale gas fields,which also reflects the current methane loss,thereby demonstrating great potential for evaluating global methane loss in shales.

关键词： Shale gas carbon isotope reversal Preservation conditions of shale gas reservoir Methane loss Estimated ultimate recovery

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