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題 名 | A Proposed Interpretation of Neogene Lithostratigraphy on Western Foothill Area, Southern Taiwan=臺灣南部地區西麓山帶新第三紀地層特性解釋 |
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作 者 | 張森吉; 曾長生; 童培堅; 李坤松; | 書刊名 | 臺灣石油地質 |
卷 期 | 32 1998.12[民87.12] |
頁 次 | 頁87-103 |
分類號 | 457.2 |
關鍵詞 | 臺灣; 南部地區西麓山帶; 新第三紀; 地層特性解釋; |
語 文 | 英文(English) |
中文摘要 | 臺灣南部西麓山帶地層之岩性及厚度差異相當大,尤其以主要逆衝斷層為差異之 界限。此逆衝斷層由西往東為: (1)觸口及崙後斷層,(2)竹頭崎斷層,(3)平溪斷層, (4)旗山斷層。 此四斷層分割此地區為四個地塊,於相同時期沉積之地層,在不同地塊,其地層特 性及厚度差異極大。為解釋此差異,本文認為張裂型正斷層所造成之半地暫為其主因。而現 今之主要逆衝斷層之形成,可能沿沉積時之此張裂型正斷層再度復活而造成。因此這些早期 張裂型正斷層之位置可能與目前主要逆衝斷層位置相同。此正斷層之傾向主要為向西傾斜, 而現今之逆衝斷層向東傾斜,故後期之變形造山作用,除沿生長斷層活動外,並改變或旋轉 其傾斜。對於油氣探勘之意義而言,此張裂型正斷層可能沿伸至相當深或較老之地層,因此 有較高之機率提供生油岩或移棲管道。 |
英文摘要 | In order to better understand the role of extensional faults during sedimentation, the lithologic analysis is conducted on the basis of well-log and field information. Three lithostratigraphic assemblages are classified for the Neogene strata on the study area. It is found that the strata form a sedimentary wedge confined in the extensional faults and the half-grabens on which the sediments are characterized by a three-fold sandstone-mudstone-sandstone synrift sediment-infill motif. The contractional deformation of the thrust faults were mainly developed along the preexisting extensional faults by "out-of the half-graben thrust" and rotation of the extensional fault. Therefore, it is apparent that the higher hydrocarbon potential zone may be located along the thrust faults which were deformed by the reactivation of the pre-existing faults to provide the conduit for hydrocarbon migration. ickness of the sedimentary cover. Spacing of the thrusts increases with the thickness of the cover. The distances from the pushing end to the deformation front and threshold above the basement high increase proportionally with the thickness of the cover as well. In cross sections, the attitude of the thrusts is highly affected by the slope of the basement high. Thrusts have a greater dip angle in models with a 30 ° basement slope. Without regard to the basement slope, dip of the thrusts is significantly less in the area close to the basement high than that in the area distant from it. By comparing the modeling results with the actual geological structures, the s-shape structural traces in the Western Foothills of south-central Taiwan can be attributed to the existence of the Peikang Basement High. However, the development of the NW-trending strikeslip faults in the Taichung-Changhua area is probably due to the displacement incompatibility in the thrust sheet where the thrust sheet meets the Peikang Basement High. Furthermore, conjugate strikeslip faults in south central Taiwan are interpreted as the Anderson-type strikeslip faults, representing a pure shear strain condition. |
本系統中英文摘要資訊取自各篇刊載內容。