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題 名 | 應用數值模擬構造解析及前陸盆地沉降撓曲探討=Application of Numerical Modeling on Structural Analysis and Investigation on Flexural Subsidence in Foreland Basin |
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作 者 | 吳榮章; 王維豪; 楊耿明; | 書刊名 | 探採研究彙報 |
卷 期 | 21 1998.11[民87.11] |
頁 次 | 頁58-83 |
分類號 | 457.2 |
關鍵詞 | 數值模擬; 構造分析; 油氣探勘; 臺灣西北部; Numerical modeling; Structural analysis; Hydrocarbon exploration; Northwestern Taiwan; |
語 文 | 中文(Chinese) |
中文摘要 | 本文除闡述有關數值模擬的原理與方法外,並嘗試以數值模式對岩石地層撓曲應 力狀態及可能斷層趨勢面發展進行分析,同時,擬藉由數值模擬觀點,探討臺灣西北部之前 陸盆地中, 尚未受到影響中央山脈荷重( Loading )之新竹外海,其撓曲剛度在線性彈性 模式( Linear elastic model )下之變化以及其模擬值與觀測值之比較。 由模擬值與觀測值對比,可知在撓曲模式中,其古構造地表地形若較單純,即地形變化趨勢 單向均一,則其結果較易趨近及符合,若其中有斷層或古構造高低非均一變化,則單純之前 陸撓曲沉降致沉積加厚則較難吻合,必需藉助更複雜邊界條件下之數值模擬,或以先回復去 除斷層效應或其他地質因素以平滑化為之。 在前陸盆地剖面端點 Forebulge 處形成垂直荷重之數值模擬, 對岩層板塊造成的應力展佈 為拋物線型式。當荷重往另一端遷移,則產生共軛正斷層及逆衝斷層之模擬結果。且由於係 拋物線狀應力彎曲,另一端一些極低角度之正斷層會演變成逆衝斷層。 利用古構造反剝數值模擬分析,研究臺灣西北部新竹-桃園地區之三維古構造,可由各時期 之埋藏深度,探知本地區各時期之古構造埋藏、起伏及演化情況;並可分析出本研究區域從 早期中新世石底層沉積結束階段→中期中新世打鹿頁岩沉積結束階段→晚期中新世南莊層沉 積結束階段→早期上新世桂竹林層沉積卓蘭層沉積結束階段→早期上新世錦水頁岩沉積結束 階段→早期更新世卓蘭層沉積結束階段→現今階段。藉以瞭解本區油氣成熟、移棲之相關古 構造分佈情形,以期找出新的探勘標的,尤其是在已發現本區南端之各油氣田的附近或北面 ,如湖口-楊梅構造附近,值得繼續加強測勘。 |
英文摘要 | This study is to explain the theories and methods about the numerical modeling and attempts to analyze the stress state and the development of potential faults within flexed strata. This study is also to investigate the variation and difference between the modeled and observed flexural rigidity in a linear elastic model for the offshore Hsinchu area, where is part of the foreland basin in the northwestern Taiwan and yet not affected by the loading under the Central Mountain Ranges. The comparison between the modeled and observed rigidity of a flexural model indicates that if the topography for paleo-structure is simple or its regional variation is rather monotonous the results would be better and more identical for the two values. On the contrary, if there exists faults causing some non-uniform regional variation in the topography for paleo-structure the thickness of sediments during simplistic forland basin subsidence would not be identical for the modeled and observed values. In order to obtain better results, it is necessary to apply more complicated boundary conditions for the numerical modeling or to eliminate and smooth any effects of pre-existing faults and any irregular geological features in advance. The simulation of vertical load on the forebulge at the distal point of a foreland basin indicates that the induced stress field in the flexed plate displayed parabolic curves and that when the vertical load is moving toward the proximal end normal and thrust faults would form in conjugate. Because of the parabolic curves of stress field some low angle normal faults would turn into low angle thrusts on the other side of the plate. By using the Backstripping Method of Geological Modeling Analysis System (Wu et al., 1992), the detail three-dimensional paleostructural evolution of these areas is analyzed. For detailed study, seven stages of time; namely: 1) from the end of deposition of the Shihti Formation of Early Miocene to 2) the end of deposition of the Talu Shale of Middle Miocene, 3) then to the end of deposition of the Nanchuang Formation of Late Miocene, 4) then to the end of deposition of the Kueichulin Formation of Early Pliocene, 5) then to the end of deposition of the Chinshui Shale of the end of Early Pliocene, 6) and then to the end of deposition of the Cholan Formation of Early Pleistocene, 7) to the last stage: Recent are classified. After evaluating the hydrocarbon potential, it is pointed out that this study area still has the highest potential in onland Taiwan, especially in the nearby or northern part of each developed oil and gas field on the southern part of the study area such as the Hukou-Yangmei Structure and deeper targets of the Chutung Structure. Therefore exploration activities should be increased in this area to find out new oil and gas reserves. |
本系統中英文摘要資訊取自各篇刊載內容。