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題名 | 臺灣西北部地區之造山運動逆衝變形前緣構造與油氣儲集=Deformation Front of Thrusting Tectonics of Penglai Orogeny and Hydrocarbon Accumulation: Coastal Area,Miaoli |
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作者 | 黃旭燦; 沈顯全; 徐祥宏; 紀文榮; 陳太山; Huang, Shiuh-tsann; Shen, Hsien-chuan; Hsu, Shiang-horung; Chi, Wen-rong; Chen, Tai-shan; |
期刊 | 探採研究彙報 |
出版日期 | 19981100 |
卷期 | 21 1998.11[民87.11] |
頁次 | 頁126-136 |
分類號 | 457.2 |
語文 | chi |
關鍵詞 | 變形前緣; 逆衝; 高角度移轉斷層; 油氣儲集; Deformation front; Thrusting; High angle tear fault; Hydrocarbon accumulation; |
中文摘要 | 在苗栗-新竹陸海域交界處,即是蓬萊造山運動造成之變形前緣構造帶,具有一 系列之雁形排列式之背斜構造,其構造幾何形貌多彩多姿,構造之形成機制複雜,油氣潛能 區的找尋對探勘人員形成重要的挑戰。 頭份-竹南構造具有三角帶,可能有低角度反向逆衝斷層出現,有利於水平方向油氣的儲集 。在垂直方向的地層荷重封閉效果也會增加。可能的缺點是低角度反向逆衝斷層的出現減弱 了頭份斷層( TF2 )的垂直落差, 使得頭份-竹南構造較相鄰的崎頂構造及白沙屯構造為 低。頭份-竹南構造原有之油氣可能再移聚於此相鄰之較高構造。也因此水飽和率偏高。 頭份-竹南構造由兩不相聯結之主要斷層組成,TF1 斷層為斗換坪斷層之延續,仍具高角度 移轉斷層及隱伏斷層之特徵。TF2 斷層為低角度由東南經西北方向且由深往淺部逆衝,較不 具移轉斷層之特點。 沿著 TF2 斷層之中間最彎曲部位之 H3 構造為 TF2 斷層背斜中打鹿砂岩頂部之最高位置, 深具油氣潛能,值得注意。 沿著 TF2 斷層或斗換坪斷層發育之 H5 構造高區是在頭份-竹 南構造內五個構造高區中之最高者,也深具油氣潛能。 |
英文摘要 | A series of anticlines in an en echelon array constitute distince tectonic features of deformation front of the Penglai Orogeny in the coastal area of Hsinchu-Miaoli. Their variable geometry and complicated structural patterns give enovmous challenges to the exploration on that area. Tziangle zone and back thrust of low angle in the Touphen-Chunan structure could have enhanced hydrocarbon accumulation through horizontal direction. The effect of seal would have been increased by vertical loading from overlying formations. What is disadvantageous is that the backthrusting would reduce vertical displacement along Touphen fault (TF2) and cause the elevation of the Touphen-Chunan structure lower than that of the Chiting and Paishatun structures. Therefore, the hydrocarbons in the Touphen-Chunan structure would have been recharged to the adjacent higher structures and replaced by higher water-saturation in reservoir of the Talu Sandstones. The major thrust fault of the Touphen-chunan structure is composed of two disconnected faults: TF 1 and TF 2 fault. TF2 fault, recognized as a high angle tear fault, is an extended part of the Touhuanping fault. TF 2, recognized as a low angle thrust, moves upward from the northwest to the southeast. The H3 hydrocarbon play, which is located on the most curving part of the TF 2 fault and is structurally at the highest part of the Talu sandstone, is thought to be the most potential area along the TF 2 fault. The H5 hydrocarbon play, which is bounded by the TF 2 fault or Touhuanping fault and also located on the structurally highest part of the five plays within the Touphen-Chunan structure, is also considered as the newest potential area. |
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