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題名 | 有機材料成熟度與生油潛能評估參數相關性研究=The Study for Correlation between Maturity and Assessment Parameters of Petroleum Potential from Organic Materials |
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作者 | 李顯宗; 蔡龍珆; | 書刊名 | 石油季刊 |
卷期 | 45:4 2009.12[民98.12] |
頁次 | 頁51-66 |
分類號 | 457.2 |
關鍵詞 | 生油潛能; 油母質; 熱裂分析; 氫指數; H/C原子比; 鏡煤素反射率; Petroleum Potential; Kerogen; Pyrolysis; Hydrogen index; Atomic H/C ratio; Vitrinite reflectance; Ro%; |
語文 | 中文(Chinese) |
中文摘要 | 近年已廣泛利用Rock-Eval熱裂分析與TOC評估生油岩品質,甚至使用氫指數(HI)及Py-GC評價烴源岩之油、氣潛能,因而忽略採用油母質H/C比值評價烴源岩。本研究以H/C原子比值針對Rock-Eval熱解參數(HI、S1、S2)與TOC相關性進行探討,進而評估有機材料生油潛能。此外,關於H/C原子比值偏高的問題,可以所測得的氫含量(H%)對碳含量(C%)作線性回歸圖,由得出Y軸截距值校正H%,據此計算油母質的H/C原子比較有可能取得精確的H/C原子比值。本研究以19個台灣西北部地區樣品、15個大陸地區樣品、16個澳洲地區樣品以及49個引用自參考文獻之樣品相關數據,共同探討油母質的H/C原子比值對熱解參數HI、S1、S2、S1+S2、S1/(S1+S2)、S1/TOC、(S1+S2)/TOC、T(下标 max)與TOC及Ro%等之相關變化,以明瞭H/C原子比值變化對有機材料生油潛能之影響。結果顯示隨著熱成熟度指標鏡煤素反射率(Ro%)值增大,HI、S1、S2、H/C值將減小。H/C原子比值在Ro%=0.55~0.85(H/C=1.1~0.7)時下降有趨緩情形。而H/C原子比值增加時,(S1+S2)/TOC值亦增加。以H/C原子比值對下列各項參數HI、S1、S2、S1+S2、S1/(S1+S2)、S1/TOC、(S1+S2)/TOC、T(下标 max)與TOC等作圖後,顯示當H/C原子比值在0.7~1.1的範圍時,各項參數值在該氫碳原子比值範圍內呈現大範圍的變化。整體而言,當H/C原子比值增加時,氫指數HI值有升高的趨勢,因此氫指數HI與H/C原子比值也呈現一定的相關性。另以HI對T(下标 max)作圖可得知大部份樣品有機材料油母質類型屬於TypeⅡ/Ⅲ型。再以(S1+S2)/TOC值作為主要指標,對不同有機材料的生油潛能進行評估發現本研究之有機材料單位有機碳生油潛量(S1+S2/TOC)值約在100~380間,與一般產氣、產油及優質生油型腐殖煤相當。此外對本研究所有樣品而言,當反射率(Ro%)值在0.55以下時,其HI值呈現不規律的大幅度變化(Ro%=0.55~0.35→HI=80~520mg/g);而AtomicH/C值在1.1以上時,其HI值則呈現穩定漸增的變化(AtomicH/C=1.1~1.4→HI=160~520mg/g),由此可知,有機材料進入油窗在Ro%=0.55、AtomicH/C=1.1時,具有一定的成熟度與生油潛能。 |
英文摘要 | In recent years, Rock-Eval pyrolysis and TOC analysis have been widely used to evaluate the quality of source rocks. Hydrogen index (HI) and Py-GC evaluation are also utilized to assess the oil and gas potential of source rocks. The atomic H/C ratio of kerogen as a way to assess the quality of organic matter in source rocks has, however, been overlooked. In this study, 19 samples from northwest Taiwan, 15 from China, 16 from Australia and 49 from literature were jointly examined to explore the atomic H/C ratios of kerogen in relation to pyrolysis parameters HI, S1, S2, S1+S2, S1/(S1+S2), S1/TOC, (S1+S2)/TOC, T(subscript max), as well as the variations in TOC and Ro%. This study aims to investigate the impact of changes in atomic H/C ratios on the hydrocarbon potential of organic matters. In addition, with regard to the issue of high atomic H/C ratio, a linear regression graph was constructed with measured hydrogen content (H%) against carbon content (C%) to correct H%, using the obtained Y-axis intercept value. This calculation of the H/C atoms in kerogens is more likely to represent an accurate atomic H/C ratio. The results showed that as thermal maturity indicator increases, vitrinite reflectance (Ro%) value, HI, S1, S2, and H/C values decrease; when the atomic H/C ratio has a Ro%=0.55~0.85 (H/C=1.1~0.7), the decline is less noticeable. When the atomic H/C ratio increases, (S1+S2)/TOC value also increases. We observed that when atomic H/C ratio is in the range of 0.7~1.1, each parameter value displays large-scale changes. Overall, when the atomic H/C ratio increases, hydrogen index (HI) also shows an increasing trend; therefore, HI and atomic H/C ratio show a certain correlation. By plotting HI versus T(subscript max), we showed that most organic matters are TypeⅡ/Ⅲ kerogens. The ratio (S1+S2)/TOC was used as an indicator of the hydrocarbon potential of different organic matters. We found the hydrocarbon potential per unit organic carbon (S1+S2/TOC) of the organic matters in this study to be approximately 100~380, similar to the potential of humic coal used in general gas and oil production. For all the samples in this study, when the reflectance (Ro%) is below 0.55, the value of the corresponding HI shows irregular substantial changes (Ro%=0.55~0.35→HI=80~520 mg/g). On the other hand, when the atomic H/C value is above 1.1, the value of the corresponding HI shows a stable increasing trend (atomic H/C=1.1~1.4→HI=160~520 mg/g). This shows that organic matters in an oil window of Ro%=0.55 and atomic H/C=1.1 have reached a certain maturity and hydrocarbon potential. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。