台灣南部新營、官田地區及周邊麓山帶二重溪層、崁下寮層有機物富集度之探討

本研究藉由新營及官田地區5口鑽探井井下岩心岩屑樣品，以及曾文溪、澐水溪露頭樣品之總有機碳含量及熱裂分析資料，探討此地區淺層二重溪層及崁下寮層形成生物氣氣田之有機物富集潛能。初步確認新營及官田地區二重溪層及崁下寮層平均總有機碳含量普遍小於0.5%，油氣潛能不高，惟少部分二重溪層井下樣品H-5深度900至905公尺、H-7B深度910至920公尺，及崁下寮層H-7A深度1140至1150公尺樣品的有機物富集度可達到普通級生油潛能的程度。官田地區岩心樣品分析結果則顯示其有機富集程度又較新營地區來的更低，2個岩心樣品總有機碳含量皆低於0.2%。曾文溪及澐水溪露頭樣品部分，總有機碳含量分布範圍為0.239%至0.438%，且在二重溪層和崁下寮層兩者之間的有機物富集度並無明顯差異。而本研究區域不論露頭或井下樣品，其總有機碳含量一般小於0.5%，僅少數樣品大於0.5%之現象，亦符合前人研究二重溪層及崁下寮層屬大洋西岸氧化海洋沉積環境濱面至外大陸棚沉積相，此沉積環境下之平均有機碳含量多半分布在0.17%至0.47%。

關鍵字

新營；二重溪層；崁下寮層；總有機碳含量；熱裂分析

並列摘要

The study aimed to determine the richness of organic matter in the Erhchungchi and Kanhsialiao Formations located in the Guantian and Hsin-Ying areas and to discuss the relationship between richness of organic matter and biogas generation. We obtained the total organic carbon and pyrolysis data by analyzing cores and cuttings from five wells in the Guantian and Hsin-Ying areas as well as samples collected from outcrops along the Zengwun and Yunshui Rivers. Preliminary study of the data indicated that the average total organic carbon content in the Erhchungchi and Kanhsialiao Formations is less than 0.5%, which implied low hydrocarbon potential. Of the samples collected from Well H5 in the Erhchungchi Formation at a depth between 900 and 905 meters and in Well H-7B at a depth between 910 and 920 meters, few showed their total organic richness reaching the level of fair potential as a source of oil. And the same conclusions for those collected from Well H-7A in the Kanhsialiao Formation at a depth between 1,140 and 1,150 meters. Analysis of cores from the Guantian and Hsin-Ying areas showed that while the level of organic richness in the former - at under 0.2% total organic carbon - is less than that of the latter, there is no significant difference between them in that respect. The level of organic carbon found in the samples collected from rock outcrops on the Zengwun and Yunshui Rivers lied between 0.239% and 0.438%. The total organic carbon content of the samples analyzed, whether they came from rock outcrops or from wells, was generally less than 0.5% although a few of them gave a higher reading. That was consistent with the results of many prior studies: namely, that the sedimentary facies of both the Erhchungchi and Kanhsialiao Formations. In that type of environment, the average organic carbon content was between 0.17% and 0.47%.

並列關鍵字

Hsin-Ying ； Erhchungchi Formation ； Kanhsialiao Formation ； Total organic carbon content ； Pyrolysis data

國際替代計量

台灣南部新營、官田地區及周邊麓山帶二重溪層、崁下寮層有機物富集度之探討

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