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摘要? 本文選取四川志留系龍馬溪組頁(yè)巖,，對(duì)所采樣品進(jìn)行了地球化學(xué),、巖石礦物組分及含氣性分析。在實(shí)驗(yàn)室內(nèi)采用磁懸浮天平進(jìn)行質(zhì)量法等溫解吸實(shí)驗(yàn),，通過(guò)頁(yè)巖氣解吸過(guò)程中甲烷碳同位素(δ13C1)組成變化研究甲烷碳同位素分餾過(guò)程,，比較不同溫度下甲烷碳同位素分餾特征；同時(shí)赴現(xiàn)場(chǎng)收集頁(yè)巖巖心解析氣,，進(jìn)行氣體組分和甲烷碳同位素分餾分析。結(jié)果表明，隨著壓力降低,，樣品中氣體逐步解吸,，甲烷碳同位素出現(xiàn)分餾特征，δ13C1值呈現(xiàn)增大的趨勢(shì),；頁(yè)巖儲(chǔ)層性質(zhì)影響甲烷碳同位素分餾,，有機(jī)碳含量相對(duì)越高，δ13C1值越大,，礦物組分和擴(kuò)散運(yùn)移也會(huì)影響甲烷碳同位素的分餾結(jié)果,；溫度影響甲烷碳同位素分餾，低溫時(shí)甲烷碳同位素容易分餾?，F(xiàn)場(chǎng)測(cè)定的甲烷碳同位素分餾變化明顯,，氣體組成隨解析時(shí)間發(fā)生規(guī)律性變化。

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關(guān)鍵詞 ：四川志留系龍馬溪組, 頁(yè)巖氣, 等溫解吸, 甲烷碳同位素分餾, 氣體組成

Abstract：

　　Several shale samples were selected from the Silurian Longmaxi formation from the Yibin region in the Sichuan Province of China. Shale samples were examined by geochemical analysis, rock mineral composition analysis and desorption experiments. Isothermal adsorption experiments were carried out by the gravity method and the carbon isotope fractionation of methane was investigated by measuring the value of δ ¹³C₁. The characteristics of carbon isotope fractionation of methane at different temperatures were compared. Moreover, the desorbed gas was collected at the same exploration sites and the gas composition and values of δ ¹³C₁ were measured. Carbon isotope fractionation of methane is influenced by shale reservoir characteristics, especially the higher the total organic carbon (TOC), the greater value of δ ¹³C₁. Mineral components and migration diffusion may influence the adsorption capacity of carbon isotope fractionation of methane. In low temperature environments, the degree of carbon isotope fractionation is higher. The range of the carbon isotope fractionation of methane in-site is obvious and has a positive correlation between the content of CH₄. Moreover, the gas composition changes regularly with the increase of desorption time.

Key words： Silurian system Longmaxi formation shale gas isothermal desorption methane carbon isotope fractionation gas composition

收稿日期: 2017-06-14 ????

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基金資助:國(guó)家自然科學(xué)基金“頁(yè)巖氣吸附—解吸過(guò)程中氣體組分變化和甲烷碳同位素分餾研究”(41372152)資助

通訊作者: 岳長(zhǎng)濤, [email protected]

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許心怡，岳長(zhǎng)濤,，李術(shù)元,，馬躍，楊飛. 四川志留系龍馬溪組頁(yè)巖等溫解吸及甲烷碳同位素分餾特征[J]. 石油科學(xué)通報(bào), 2018, 3(1): 1-10. XU Xinyi, YUE Changtao, LI Shuyuan, MA Yue, YANG Fei. Isothermal desorption and methane carbon isotope fractionation of shale gas in the Silurian Longmaxi formation, Sichuan. Petroleum Science Bulletin, 2018, 3(1): 1-10.

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