頁籤選單縮合
題名 | 臺南盆地油氣潛能綜合評估=Integrated Assessment of Hydrocarbon Potentiality in the Tainan Basin |
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作者 | 林國安; 楊耿明; 宣大衡; 張資宜; 梁守謙; | 書刊名 | 臺灣石油地質 |
卷期 | 37 民94.12 |
頁次 | 頁29-56 |
分類號 | 457.2 |
關鍵詞 | 臺南盆地; 石油地質; 盆地分析; Tainan basin; Petroleum geology; Basin analysis; |
語文 | 中文(Chinese) |
中文摘要 | 本研究根據對臺南盆地所作的盆地構造演化以及相關的地層層序的探討,並綜合先前相關研究成果,進行其油氣潛能綜合評估,並提出臺南盆地往後探勘的展望以及幾個值得繼續探勘的目標區。 中央隆起帶之儲集岩主要為位於漸新統不整合面上的基底砂岩。這些砂岩的分佈受到當時沉積地形之影響,具有局部尖滅的現象,而此尖滅之基底砂岩可能儲集來自低區的油氣。在F-2井及F-1井一線東側的平移斷層之處,在漸新世晚期即已形成一沉積地形,兩側的地形低區內上覆的砂岩體可能含有油氣潛能。F-2井所在的斷層塊內,在F-2井東西兩側各存在一構造高區,值得鑽探。而F-2井之石灰岩層缺乏蓋層,因此在F-2井之斷層塊應尋找有緻密頁岩作為其蓋層之處。F-2井之斷塊內,先漸新統不整合面下的中生代地層具有明顯傾角,代表一較發達並伴隨正斷層活動發育的裂縫帶,可成為油氣移棲管道,因此,若傾斜的中生代地層被不整合面上的緻密頁岩所覆蓋,亦可成為油氣儲集層。 北方凹陷在NP24以及中新世早期為一地形上之低區,在中央隆起帶北側‘B’斷層降側存在一朝低區前覆約三角洲相砂體,可儲集來自北方凹陷中心生油岩所產生的油氣。W-1井附近的下部中新統頂部砂岩為一沿岸的砂洲,而先漸新統(?)不整合面上覆的地層也具有明顯三角洲的沉積相,因此在W-1附近,沿著邊界斷層的構造兼地層封閉可能儲集來自凹陷中心的油氣。在J-1井南側,存在一下部中新統丘狀沉積岩體,代表深海相約的高能量沉積相,其砂體可儲集來自附近生油岩的油氣,且又位於構造高區內,因此值得鑽探。 |
英文摘要 | Based on the analysis of the tectonic evolution and genetically related sequences in the Tainan Basin, and combining all the results from previous studies, we propose new play concepts for future evaluations, and several potential lead areas in the Tainan Basin. In the "Central Uplift" area in the southern part of the Tainan Basin, the basal transgressive sandstones that onlap onto the pre-Oligocene unconformity are the main reservoirs. The distribution of the sandstones is controlled by the depositional topography during deposition. Locally, the basal transgressive sandstones would pinch out and might provide traps for the abundant hydrocarbons generated from the adjacent structural lows. On both sides of the N-S trending transfer fault near the F-2 and F-1 wells, during late Oligocene onlapping sands deposited in the topographic low could be quite prospective, Within the F-2 well fault block, two prospective structural highs are identified. The F-2 well indicated an absence of good top seal for the lower Miocene limestone, and thus we should look for presence of competent shaly seal in the F-2 fault block. Within the F-2 faulted block, the Mesozoic strata are tilted below the pre-Oligocene unconformity, which might indicate the existence of fracture zones as conduits for hydrocarbon migration. Also, fractured Mesozoic strata could form effective resservoirs where they are overlain by competent shale as seal. The North sag area was a topographic low during NP24 to early Miocene, and north of the northern boundary fault of the Central Uplift area, i. e., "B" normal fault, sandstones deposited in a northward prograding deltaic sequence could form traps for hydrocarbons generated in the center of the North Sag. The upper sandstone in the lower mid-Miocene in the vicinity of the W-1 well is interpreted to be coastal to neritic longshore bar facies, and the strata overlying the early-Oligocene unconformity also exhibit obvious deltaic facies. Therefore, the structural and stratigraphic traps along the boundary fault system could also entrap the hydrocarbons generated from the sag South of the J-1 well in the center of the sag area, lower-Miocene mounds, interpreted to be deep-water, high-energy facies, are identified on structural highs. Further evaluations are warranted, since the sand bodies within the wounds could also entrap hydrocarbons generated in the deep sag. |
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