題　名：台灣中西部之石油地質研究 ---區域性震測相與沈積環境分析

The Analysis of Seismic Facies and Sedimentology in the Mid-Western Taiwan Area.

研究者：蕭承龍 ; 丁信修 Shaw,Cheng-Long ; Ting,Hsin-Hsiu

機構名稱：中國石油公司探採研究所 (TPEO)

研究日期： 1992/07 - 1993/06

出版日期： 1993/06

頁冊數： 192

中文摘要：本專題係以台灣西部盆地白堊紀新生代地層為研究對象 ,綜合台灣陸海域地層、小化石、不整合面的分布及震測地層等資料,完成台灣西部盆地之地層對比及各時期之地層等厚 圖,配合區域性震測相及有孔蟲之古沈積環境分析得以建立各時期之古地理圖。台灣西部盆地之沈積發育及地體演化,其演化概略可分為四個主要階段:第一為從白堊紀早期的穩定大陸棚沈積到白堊紀晚期、古新世初期發生的地殼隆昇作用,造成中生界與新生界間地層之缺失。第二包括古新世大陸棚斷裂,形成台灣北部海域各盆地及台西、南日島盆地等,這些盆地形貌一直維持到始新世,並加上始新世才形成之澎湖盆地雪山盆地。漸新世早期,現今台灣中央山脈軸心以西皆隆起成為侵蝕帶,因此造成台灣第三紀中面積廣大的不整合面。接著就是北港及觀音二高區的形成, 一直影響著晚期漸新世、中新世及上新世早期之沈積,是為第三階段之盆地發育。第三北部大致以新竹苗栗一帶為沈積中心沈積物來源以西邊或西北邊為主,南部則增加了新形成的澎湖、北港以南之南部盆地;第四階段於上新世晚期更新世時期,由於受菲律賓板塊的碰撞台灣造山運動急劇進行,此時已逐漸形成台灣海峽並持續的沈降,第四階段之沈積最厚地區為 台中南投一帶。

英文摘要： Four east-west cross-sections, namely "C", "D", "E" and "F" and two north-south corss-sections, "A" and "B" of the basins of western Taiwan were constructed to show the distribution and variation of the stratigraphy. With reference to the Tertiary tectonic framework, the area extent of the unconformities, the isopacks of the major stratigraphic unit, regional seismic facies analysis and micropaleontology, the paleogeographic maps at different ages were mapped. Four major stages of tectonic and sedimentological developments were recognized. The first stage involved the crustal uplift at the end of the Mesozoic which caused the regional erosion of the upper Cretaceous. The second stage included the Paleocene rifting and consequently the formation of the offshore basins north of Taiwan and the Taihsi-Nanjihtao Basin . The refting persisted through Eocene and at that time initiated the opening of Penghu Basin, the west and south of the rifted basin margin was land, which included the whole area to the south of the Penghu Island and Peikeng High. In the early Oligocene, area west of the present day axis of the Central Range was uplifted and subject to erosion, a phenomenon signified by the worldwide regression, forming the widest unconformity during the Tertiary time in Taiwan. The third stage of sedimentation of the late Ologocene Miocene and early Pliocene was controlled by the Peikeng and Kuanyin Highs and four periods of transgression and regression were differentiated as follows: The first cycle consists of formations from the Wuchihshan to Mushan Formations. The second from the Taliao to Shihti Formation; the third from the Peiliao to Nanchuang Formation and the fourth from Kueichulin Formation to Chinshui Shale. The Fourth stage of sedimentation of the late Pliocene and Pleistocene was controlled by the active Taiwan orogen resulting from the collision of the Philippine Sea Plate.