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題名 | CDA礦區盆地架構與構造模型=Basin Architecture and Tectonic Mode in CDA Field |
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作者 | 楊耿明; 吳榮章; 丁信修; 傅式齊; | 書刊名 | 探採研究彙報 |
卷期 | 20 1997.11[民86.11] |
頁次 | 頁45-60 |
分類號 | 457.2 |
關鍵詞 | CDA礦區; 盆地架構; 地體構造; Tertiary basins; CDA basin; Basin architecture; Tectonics; |
語文 | 中文(Chinese) |
中文摘要 | 本研究的目的旨在利用地架構和構造模型的分析來探討臺灣西部先中新統的石油 盆地。我們今年的研究集中在CDA礦區的始新統盆地(以下簡稱CDA盆地),未來將 應用相同的方法去探討其他的盆地。 CDA盆地始新統的各地層界面經震測對比,可以分屬不同的時間層面。CDA盆地 的構造形貌以正斷層為主,正斷層大致分兩組,一組走向東北東-西南西,另一組東北 北-西南南,兩組在盆地中心交會,同時形成CDA菱形的盆地形貌。CDA盆地的斷層 面滑移量大致上從西南端往東北端漸減然後再漸增,顯示在CDA盆地發育的早期,先有 兩組走向不同的正斷層同時發育,先形成兩個次盆地,當兩組斷層經側向發育而交會 時,正斷層的活動大多集中在東北北-西南南走向的斷層線上,同時形成厚層的同張裂 沈積物,而在正斷層活動近乎停止之後,CDA盆地改以向東北方向增加下沈量的機制繼 續發育。經由盆地伸張量計算的分析,CDA地區地殼伸張量不完全是由於正斷層活動所 引起之斷塊旋轉所致,後張裂期的下沈歷史指示在正斷層活動之前,CDA可能曾有過另 一次張裂活動。 |
英文摘要 | The main purpose of this study is to investigate, with analysis on basin architecture and tectonic mode, the pre-Miocene sedimentary basins in the western Taiwan. We focus our study on the Eocene basin in the CDA field (named CDA Basin below) this year and will apply same methods on the other basins in future. After we made detailed picking and tracking reflectors on seismic sections, each of previously identified major sequence boundaries, which were correlated mainly based on well log character, in the CDA Basin can be recognized and recorrelated into a new stratigraphy system. The new stratigraphic correlation was the basis for us to work on the tectonic analysis. The tectonic feature of the CDA Basin is mainly characterized by normal faulting. The normal faults can be grouped into two sets, one striking NEE-SWW in the northeastern part of the basin and the other striking NNE-SSE in the southwestern part of the basin. Two sets of normal fault intersect in the muddle of the basin and, thus, form a rhomb shape of the basin on the map view. Displacement on most of the normal fault planes decreases toward the middle of the basin where two sets of normal fault intersect. Such variation in displacement implies the tectonic evolution of the basin. Two sets of the normal fault wre developing at the same time and formed two separated subbasins in the early stage of the basin evolution. After two sets of normal fault propagated laterally and intersected to each other, most of normal faulting occurred along the normal faults striking NNE-SSW in the southwestern part of the basin and caused accumulation of thick syn-rift deposits. The basin continued to develop with subsidence rate increasing toward the northeast after the end of climax of normal faulting. Calculation of extension rate of the basin indicates that the magnitude of crustal extension in the CDA area is not entirely due to block rotation caused by normal faulting; the history of post-rift subsidence indicates that there might have been another extensional tectonic movement before the normal faulting. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。