| 摘要: | 有機材料生烴潛能與油母質熱成熟度有關，而評估油母質熱成熟度的最佳指標之一即為鏡煤素反射率? (Ro%)，但Ro%的量測會受到三項因素影響，人為誤差、技術問題、及由於有機質的結構與組成不均勻性所衍生之問題，前二項因素可依國際的標準作業流程ASTM 及ISO 等予以克服，而屬於最後一項的反射率抑制及統計問題(關於量測點數少、再沉積樣品等)是較不易克服的，必須以統計分析的方法處理鏡煤素反射率量測? ，方能得出較適合的油母質成熟度指標Ro%? 。烴類生成最重要的是有機材料熱成熟作用，此成熟過程為不可逆反應，不受退化變質的影響，可記錄深埋史上最強烈的熱事件。在熱力作用下，有機質同時存在分子結構縮聚和部份分子鍵斷裂降解二個相反的反應方向。隨著演化程度加深，油母質(kerogen)結構中的支鏈及雜原子基團斷裂脫落，芳香 (aromaticity)縮合程度增高，其H/C 原子比改變，因而使有機質成熟度 (maturity)產生改變，並影響其生油潛能，且H/C 原子比值隨鏡煤素反射率（ＲＯ％）值增加而減小。本研究擬透過煤素質分析、鏡煤素反射率量測、Rock-Eval 熱裂分析、MS 同位素分析、ICP 主要元素分析，建構確實有效之烴類成熟度參數，成為有機質生油潛能新指標，以期增進油氣探勘效能。本研究期望藉著針對相關參數，使用一些統計分析的方法(散佈圖與相關係數、迴歸分析、複迴歸分析、主成分分析、因子分析，集群分析、Logistic 迴歸分析、Probit 分析、判別分析、及共變異數分析等)，歸結出與有機材料生烴潛能相關之前述所列各項參數彼此間之關性。故本研究第一年（96 年）擬以台灣西北部地區油氣主要生產地之有機材料為主，研發創新有效的評估參數，以建立正確有效的油氣潛能評估指標，裨對油氣探勘有所助益。第二年（97 年）亦將以統計分析的方法探討鏡煤素反射率量測值，並進一? 探究其與前述有機材料生烴潛能各項評估參數的相關性，以期獲得較佳的生烴潛能評估指標，且能對油氣潛能與探勘提供建議。 Although organic matter has many types of evolution, thermal mature process is an important factor in hydrocarbon generation. The maturity of organic matter is one of the most important parameters in the evaluation of oil-gas potential. In the assessing maturity of organic matter, vitrinite reflectance (Ro%) is the mostly examined parameter. There are three major characteristics need to be studied for getting good petroleum potential in source rock: properties of organic matter, mature process, and hydrocarbon abundance. Because of pressure increases the activation energies of organic matter in maturation reactions, which might lead to the suppression of vitrinite reflectance. In addition, vitrinite reflectance may also be strongly influenced by oxidation, so we must be careful in avoiding the underestimation or overestimation of Ro values. In order to achieve a reliable synthetic evaluation of hydrocarbon potential, the process of thermal maturation which varied as the organic matter altered, needs to be studied in detail. The maturation process is irreversible, not influenced by retrograde metamorphism, can only record the maximum thermal event in the burial history. During the thermal maturation process, the construction of hydrocarbon maturity is the most important work. The sterane and terpane isomerization ratios have been applied widely for the assessment of thermal maturity in crude oils and their source rocks. Rock-Eval pyrolysis and TOC determinations are the most widely used methods to characterize source rocks. Traditionally, the hydrogen index (HI) is used to assess the oil and gas potential of source rocks, unless calibrations between the hydrogen index and pyrolysis GC are done. We can use Rock-Eval and TOC data to give a rapid assessment of the average oiland gas-producing constituents in source rocks. Therefore, the maturity parameters of hydrocarbon must be explored in order to construct the effective indices for the assessment of hydrocarbon potential. The purpose of this study is to establish a reliable synthetic assessment indices for the evaluation of hydrocarbon potential. The scope of this study will be focused on maceral composition analysis, vitrinite reflectance measurement, Rock-Eval pyrolysis, and ICP major elements analysis. Va rious statistic analysis including regression, major component, cluster, logistic, probit, discriminant and cokriging analysis will then performed to assess hydrocarbon potential. 研究期間：9601 ~ 9612 |
