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題 名 | Depositional Model for the Oligocene Sandstone in the Southwest Taiwan Offshore=臺灣西南海域漸新統砂岩之沉積模式 |
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作 者 | 黃富文; 梁守謙; 莊漢珍; | 書刊名 | 臺灣石油地質 |
卷 期 | 32 1998.12[民87.12] |
頁 次 | 頁69-86 |
分類號 | 457.2 |
關鍵詞 | 臺灣; 西南海域; 漸新統砂岩; 沉積模式; |
語 文 | 英文(English) |
中文摘要 | 本文根據臺灣西南海域盆地中三維震測區的連井震測線解釋,鄰近鑽井資料,並 橫切盆地之二維測線之解釋分析建立漸新統砂岩之沉積模式。 研究中發現盆地內有油氣發現之三維震測區為位於所謂中央隆起帶上之古高區,漸新統 砂岩為沉積在不整合面上之海侵砂岩,沉積之後因短暫的海退而受到程度不等之剝蝕,其剝 蝕程度依當時之沉積高度而定。處於當時最高區古長脊沉積的漸新統砂岩被剝蝕殆盡,但沉 積於中央隆起較低區構造平臺上之漸新統砂岩除在高區受到剝蝕截切變薄外,砂岩因接近古 海水面而受到程度不一的淘選作用。此古高區構造平臺上沉積之漸新統砂岩帶為目前油氣富 集之目標區。 證諸古高區鄰近及盆地邊緣諸井鑽探資料亦有同樣現象。依此沉積模式,為探得利於油 氣儲集之漸新統砂岩,高度適當之古構造平臺之認定為關鍵所在。 |
英文摘要 | Based on the interpretations of zigzag 3D seismic sections, transverse 2D seismic sections, and subsurface geologic data from drilling, a depositional model is established for the Oligocene sandstone in the southwest Taiwan offshore. In this region, the hydrocarbon discovered 3D seismic area is a paleohigh located in the "Central Uplift Zone". The Oligocene sandstone is a transgressive sandstone deposited on an unconformity surface of this paleohigh. After the Oligocene sandstone deposition, there was a short period of sea level dropped down, hence to cause erosion as well as wave winnowing on top of this sandstone. The sandstone deposited on the ridge crest of the paleohigh was eroded away and the sandstone deposited on a low flat structural terrace in this paleohigh was winnowed by sea wave to increase grain sorting and to reduce clay content. The Oligocene sandstone deposited on this structural terrace thus has good hydrocarbon reservoir quality to become the target bed in this region at present. Study results from the geology of the nearby region and drilling data from the wells in the basin margin support the idea of this deposition model. According to this model, we should find a structural terrace from other part of the paleohigh region for the purpose to find out the good hydrocarbon bearing Oligocene sandstone deposition. |
本系統中英文摘要資訊取自各篇刊載內容。