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題 名 | 八掌溪氣田電測整合解釋與應用=Integrated Well Log Interpretation for PCC Area,Southern Onshore Taiwan |
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作 者 | 羅仕榮; 顧駿偉; 周定芳; 陳佑吉; 張資宜; | 書刊名 | 探採研究彙報 |
卷 期 | 21 1998.11[民87.11] |
頁 次 | 頁1-18 |
分類號 | 457.2 |
關鍵詞 | 儲集岩; 電測分析; Well logging; Reservior; |
語 文 | 中文(Chinese) |
中文摘要 | 八掌溪油氣田自民國 61 年起,至今已鉆探完成 17 口井,至 86 年底,共有 7 口井投入生產,總計生產之天然氣約 2 億餘立方公尺,原油 1 千 9 百餘公秉,唯 80% 以 上之油氣產自K斷層地塊之 PCC-3,9B,12B 三口井之北寮層,其他斷層( A, F, P, G ) 地塊及其他地層(木山,觀音山,石底等)則僅有少量且短期的生產。 自 PCC-13 號井以後諸井,則未有成功的油氣測試及完井生產,且臺灣南部普遍分佈,儲集 岩性質良好之八掌溪砂岩並未成為主力生產層。為明瞭油氣層試驗成功與失敗原因及岩性特 徵與電測反應間之關係,作為未來探勘、開發、生產之參考,因此值得對儲集岩進行系統性 的分析與研究。 岩心薄片分析指出,八掌溪及鄰近地區(臺西、民雄、北港、四湖、金湖等)之八掌溪砂岩 (木山層)普遍含有黃鐵礦在岩石孔隙中或集中成顆粒狀與石英顆粒並存,這是造成八掌溪 砂岩電阻電測值極低之主要原因,八掌溪油氣田中唯一從八掌溪砂岩中生產之 PCC-8D 井, 經分析其油氣亦來自低電阻地層。分析掌溪砂岩之油氣測試結果,証實有油氣存在,但因裸 孔測試壓力差過大或有地層傷害,因此未獲得立即肯定的結論,值得未來進行適當的測試。 八掌溪砂岩之岩石特性(中至粗顆粒、疏鬆)在水飽和率計算時,須特別考慮其膠結係數m ,並選擇適當的水飽和率模型,其結果才會接近合理範圍。 北寮層在油氣測試生產過程中,亦証明有低電阻油氣層存在,其原因經岩石薄片分析,除含 有黃鐵礦外,石英顆粒被更細小之菱鐵礦或其他細小頁岩包裹,也可能是造成低電阻油氣層 原因之一。北寮層頂部普遍有一薄層之放射性砂層╱石灰岩層存在,過去作為與打鹿頁岩之 地層分界, 但詳細檢視 NGS 電測曲線,北寮層頂部砂層與打鹿頁岩底部之砂層有可能屬連 續砂層,其油氣潛能值得去測試。 北寮層頂部之石灰岩層層厚以 PEF 電測可以清楚的界定, 其岩石特性與油氣潛能需要進一 步詳細分析。 觀音山砂岩在八掌溪地區普遍分佈,其細至極細粒,且未良好固結之砂岩特性,加上含有黃 鐵礦、海綠石及大量雲母,且互層發達,使電測解釋並未能完全依照常規方法。油氣試驗亦 証明有低電阻油氣層及地層傷害發生,系統性研究分析,應可大幅提昇。 |
英文摘要 | Seventeen wells have been drilled in the PCC area since 1972. By the end of 1997, about 200 million cubic meters of natural gas and 1.9 million liters of oil were produced from only seven wells. More than 80% of the total oil and gas production came from the Peiliao Formation in wells PCC-3, PCC-9B and PCC-12B in the K-block. Oil and gas production from other formations and the production periods were very short. There have been no successful well tests or completions for production since the PCC-13 well was drilled in 1989. Although the quality reservoir of the PCC Sand is found widely in southern Taiwan, this sand has not become the main production formation as expected in the early exploration stage. Widely distributed pyrite in the pores of the PCC Sand has resulted in low resistivity which made evaluation difficult. The hydrocarbon potential has probably been overlooked. The reasons for the failure of well tests and well logging evaluation are worth further study. In the Peiliao Foramtion, low resistivity pays have been confirmed by well tests. The major causes of the low resistivity are probably the presence of pyrite, and the coating of siderite of fine clay on the quartz grains as seen in thin sections. At the top of the Peiliao Formation, there is a thin radioactive sandstone as shown by high uranium content. This radioactive sandstone is used as the boundary with the Talu Sand, which were deposited directly on the top of the Peiliao Formation. From the EGR and CGR logs, the Peiliao Fomation and the lower part of the Talu Sand may be a continuous sand sequence rather than two different sand bodies. The PEF log can be used effetively to define a limestone of varying thickness in the upper part of the Peilliao Formation. The hydrocarbon potential of the limestone should be evaluated more precisely. The Kuanyinshan Sand is widely distributed in the PCC area. The sand grains are fine to very fine and uncemented. With varying amounts of pyrite, glauconite and mica in the Kuanyinshan Sand, it is difficult to evaluate this formation, especially when using only well log data. The problems of both low resistivity pay and formation damage should be studied in more detail in order to upgrade the potential of this reservoir. Only one well, PCC-6C, produced hydrocarbons from the Shihti Formation. The amount of production is small and the production period is short. This formation has not received much attention and is not well understood. More detailed studies are required. This report presents the first stage results of a complete study on the PCC area. A more comprehensive study on the reservoirs will be continued to benefit all stage of exploration, production and reservoir management. |
本系統中英文摘要資訊取自各篇刊載內容。