頁籤選單縮合
題名 | Atomic H/C Ratio of Coal and Carbonaceous Shales as an Evaluation Parameter of Hydrocarbon Potential 2 3,4=氫碳原子比評估煤與含碳頁岩之生油潛能 |
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作者 | 李顯宗; 蔡龍珆; 孫立中; | 書刊名 | Western Pacific Earth Sciences |
卷期 | 8 2008.12[民97.12] |
頁次 | 頁93-114 |
分類號 | 457 |
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; Hydrocarbon potential; Kerogen; Pyrolysis; Hydrogen index; Atomic H/C ratio; Vitrinite reflectance; Ro%; |
語文 | 英文(English) |
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。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 157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、Tmax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、Tmax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Tmax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 = 80-520 mg/g);而 Atomic H/C值在 0.7-1.1時,其 HI值則呈現穩定漸增的變化 (Atomic H/C = 0.7-1.1→ HI = 120-520 mg/g),由此可知,有機材料在開始進入油窗 Ro% = 0.55、Atomic H/C = 1.1時,具有一定的成熟度與生油潛能。 |
英文摘要 | The Rock-Eval pyrolysis and TOC analysis have been widely used to evaluate the source rock quality. The atomic H/C ratio of kerogen, however, has been overlooked in the source rock evaluation. In this study, coal and carbonaceous samples, including 19 from northwestern Taiwan, 15 from China, and 16 from Australia were analyzed. These analysis results were also integrated with 157 published data to explore the significance of atomic H/C ratio as a parameter of source rock evaluation. Organic matters in the samples studied are of type II/III kerogen based on the relationship between HI and Tmax. The H/C ratio, as well as the HI, S1, and S2 generally decreases while the maturity increases. The H/C ratio decreases slightly from 1.1 to 0.7 while maturity increased from Ro 0.55% to 0.85%. Samples with H/C ratio within this range show significant change in certain other geochemical parameters (eg. HI, S1, S2, S1+S2, S1/(S1+S2), S1/TOC, (S1+S2)/TOC, Tmax). The (S1+S2)/TOC ratio (defined as QI) was used as an indicator of the hydrocarbon potential. The QI, HI and H/C ratio show a certain positive correlation, all increasing accordingly. The QI of the samples analyzed in this study is approximately 100 to 380 (mgHC/gTOC), similar to that of most humic coals for oil and gas generation. Samples with Ro value lower than 0.55% always show significant variation in their HI, ranging from 80 mgHC/gTOC to 520 mgHC/gTOC. It is inferred that hydrocarbon potential started from Ro 0.55% and atomic H/C ratio 1.1 in this study. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。