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題 名 | Gas Hydrate Resource Appraisal--Concepts and Methodologies Extended from Petroleum Exploration=氣體水合物的資源評估油氣探勘觀念及技術的延伸應用 |
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作 者 | 翁榮南; | 書刊名 | 臺灣石油地質 |
卷 期 | 37 民94.12 |
頁 次 | 頁1-12 |
分類號 | 457.2 |
關鍵詞 | 氣體水合物; 石油系統; 臺灣西南海域; Gas hydrate; Petroleum system; Offshore southwestern Taiwan; |
語 文 | 英文(English) |
中文摘要 | 氣體水合物是天然氣封存在固態水分子中所形成的結晶體,經常賦存在永凍區及大陸邊緣深水區的海床下,由於賦存量甚大且單位體積中的天然氣含量高,被認為是未來重要的能源之一。氣體水合物的資源評估主要涉及天然氣的來源及封存,因而可參照油氣探勘界的石油系統觀念,建立所謂的氣體水合物系統,以檢視及評估氣體水合物的資源。根據震測資料所顯示的海底擬反射研判臺灣西南海域有氣體水合物存在,本文以氣體水合物系統的觀念探討該區天然氣的生成來源以至氣體水合物的生成及可能分布。臺灣西南海域氣體水合物的氣體來源包括不成熟的生物性甲烷及熱生成的成熟天然氣,生物性甲烷主要為近代沉積物在早期成岩階段生成,成熟天然氣則是深層成熟地層的產物,生成後經由斷層向上移棲,二者最後均在淺層的氣體水合物穩定層中形成氣體水合物,據此可見斷層系統是控制氣體水合物分布的重要因素,而不同來源的天然氣因化學成分不同亦將影響氣體水合物穩定層的深度及厚度。應用油氣探勘中常用的評估技術整合各項有關氣體生成移聚的因素,配合氣體水合物穩定層溫度壓力條件的存在,應可進一步定量評估該區的氣體水合物資源。 |
英文摘要 | Gas hydrates are crystalline compounds in which the ice structure of water is distorted to form cages trapping gas molecules. Gas hydrates have been regarded as a potential energy resource in this century. Analogous to the petroleum system, the term "gas hydrate system" is introduced to describe the gas generation, migration, and finally accumulation and preservation in gas hydrates. Most methodologies and techniques in petrobleum exploration may be applied in gas hydrate resource appraisal. Gas hydrate system in the area of offshore SW Taiwan is described and evaluated. Both biogenic gas and thermogenic gas are involved in this gas hydrate system. Biogenic gas is generated from recent sediments containing mainly reworked organic matters in the early diagenesis stage. Thermogenic gas is generated from deep formations at moderate maturation level and has migrated upwards through faults as conduits. Both gases form gas hydrate accumulations in the GHSZ. The fault system should therefore be an important consideration for evaluating gas hydrate distribution. Chemical composition of the gases with different origins may affect the depth and thickness of the GHSZ. Further evaluation of the resource potential of gas hydrate may depend on better understanding of all the elements and processes involved in the gas hydrate system. |
本系統中英文摘要資訊取自各篇刊載內容。