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題名 | 苗栗地區打鹿砂層的沈積環境與地層架構=Sedimentary Environment and Stratigraphic Architecture of Talu Sandstone in Miaoli Area |
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作者 | 丁信修; 楊耿明; | 書刊名 | 石油季刊 |
卷期 | 34:4 1998.12[民87.12] |
頁次 | 頁1-24 |
分類號 | 457.2 |
關鍵詞 | 苗栗; 打鹿砂岩; 沈積環境; 地層封閉; Miaoli; Talu sandstone; Sedimentary environment; Stratigraphic trap; |
語文 | 中文(Chinese) |
中文摘要 | 苗栗地區的打鹿砂岩是該區的油氣儲集層,由多層砂層所組成。打鹿砂岩的沈積 環境以及不同油氣田之間的砂層對比,前人多所研究,而有不同的看法。本文乃根據海水面 升降變化對層序單位內沈積相以及準層序對比的影響,來探討苗栗地區打鹿砂岩的地層特性 。鐵通地區的打鹿砂岩依準層序單位的特性可畫分為九個準層序單位,每個單位代表沉積環 境由深漸淺再迅速變深的循環。針對打鹿砂岩九個準層序單位之間厚度變化所作的分析顯示 ,沉積打鹿砂岩時期的第三層級循環海水面變化為一快速上升至高水面後再下降,然後下降 速率減緩的過程,顯示打鹿砂岩係一前進堆積體。因此東邊砂層層數較少的打鹿砂岩應對比 到西邊鐵通地區打鹿砂岩上段的砂層,同時下段的砂層向東分佈的範圍有限,僅限於鐵砧山 背斜構造的東翼,無法形成地層封閉。至於中段的砂層則分佈較廣,其厚度從鐵砧山構造東 翼始明顯增厚,而在東邊背斜構造西翼轉變作為頁岩相,所以該段砂層可能在鐵砧山背斜構 造東翼和東邊背斜構造的西翼形成上傾的地層封閉。 |
英文摘要 | The Talu Sandstone is the main reservoir in Miaoli areas, which consists serveral sandstone units. Many previous studies have been done on the sedimentary environment and stratigraphic correlation for the Talu Sandstone among different producing fields and the opinions about the characters of the formation are still controversial. This study will propose a new model for the characters of the Talu Sandstone, based on the theories about the effect of sea level fluctuation on sedimentary facies and correlation of parasequence units within a sequence uint. According to the definition and characters of parasequence unit, the Talu Sandstone in the Tiechienshan-tunghsiao areas can be divided into nine parasequenc units, each unit being characterized by a shallowing upward cycle which is ended with a sharply deepening facies change. The analysis on the variation in thickness among the parasequence units indicates that the Talu Sandstone was deposited during an interval of rapid rising and falling of third-order sea level fluctation. The analysis also indicates that the Talu Sandstone is a progradational sedimentary wedge. Therefore, the Talu Sandstone in the area to the east of the Tiechienshan-tunghsiao areas, where the number of sandstone unit is much fewer than that in the Tiechienshan-Tunghsiao areas, should be correlated to the upper part of the Talu Sandstone in the Tiechienshan-Tunghsiao areas. While distribution of the sandstone units in the lower part of the Talu Sandstone in the Tiechienshan-Tunghsiao areas is not beyond the eastern limb of the Tiechienshan anticline. The thickness of the sandstone units in the middle part of the Talu sandstone becomes thicker from the eastern limb of the anticline and might extend to the western limb of the next anticline to the east, where the sandstones units change into shale facies. Therefore, the sandstone units in the middle part of the Talu sandstone might form stratigraphic traps both in the eastern limb of the Tiechienshan anticline and in the western limb of the anticline to the east. |
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