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題名 | 竹東-番婆坑麓山帶三維複雜構造分析=Analysis of 3D Complicated Structure in the Foothill Belt, Chutung-Fangpokeng |
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作者姓名(中文) | 黃旭燦; 梅文威; 涂嘉勝; 王佳彬; 何在浩; 張渝龍; 林麗華; | 書刊名 | 石油季刊 |
卷期 | 49:3 2013.09[民102.09] |
頁次 | 頁99-126 |
分類號 | 457.2 |
關鍵詞 | 隱伏背斜; 竹東斷層; 斷層擴展褶皺; 四個油氣潛能區; Blind anticline; Chutung fault; Fault-propagation fold; Four potential highs; |
語文 | 中文(Chinese) |
中文摘要 | 本研究之重要研究結果發現在竹東番婆坑地區具有四個潛能區,並加以排序,其石油系統以打鹿頁岩為蓋層、北寮層為儲集岩。此區之油氣均已達成熟階段,此研究重要結果乃綜合野外地質圖分析、野外地質工作、建構新的地質剖面、模擬修改前人研究地質剖面及1萬分之一精密之井下地質剖面分析而完成。最重要的潛能高區(A),在竹東構造,竹東斷層“下盤"之獨立隱伏背斜,此構造(1)形成時間接近於出磺坑背斜者,因此極有利於油氣的移棲與聚集,(2)符合於地表伯公坪斷層、頭份林斷層及軟橋斷層交會處,此區具有較大的變形量及水平位移量,(3)大地電磁波測勘證實深部存在一高電阻區,其形貌類似隱伏背斜,可能顯現出打鹿石灰岩地層的構造形貌,(4)三維構造模擬證實位於CTU-24及CTU-25號井正下方有大規模的隱伏背斜存在,可能直接供應竹東背斜淺部儲集構造之油氣。淺層竹東背斜多層次生產層亦證明垂直移棲之論點,(5)位於竹東逆斷層下盤,因而此構造垂直封阻性良好。第二潛能高區(B)位於番婆坑地區竹東斷層的下盤,恰位於FPK-3及FPK-5井的正下方的隱伏背斜,其特性與竹東隱伏背斜類似,但此背斜之西南緣為竹湖斷層截切,油氣可能會沿此斷層滲漏至地表,但若有四方圈合則會儲聚油氣。機率大增,(1)從地表地質推論番婆坑背斜有往西南方向傾沒,(2)位於軟橋斷層轉彎處及大坪斷層交會處,(3)竹湖斷層轉彎處。由以上推論番婆坑隱伏背斜仍有很大的油氣潛能。第三潛能高區(C)位於竹東25號井附近(1)位於竹東斷層的“上盤",可能具有豐富之裂縫儲集,打鹿砂岩僅25公尺厚,打鹿頁岩被石灰岩相取代。(2)位於軟橋斷層下盤(3)竹東25號井因卡鑽而放棄,其油氣結果未知,因此此區仍具有很大的潛力。第四潛能高區(D)位於番婆坑3號井附近(1)番婆坑3號井僅鑽至打鹿頁岩之石灰岩相側邊,因此仍有機會探尋其下置之北寮層內之砂岩。(2)因番婆坑構造屬於斷層擴展褶皺,竹湖斷層沿東坑1,255公尺層頂部陡峭前翼當滑離面而背衝,因此在“竹湖斷層下盤"才有發現油氣潛能區的機會,以往的探勘集中於竹湖斷層上盤。(3)此構造位於竹東層上盤,(4)亦位於軟橋斷層下盤。 |
英文摘要 | The most important result of this study is that four potential traps were found and ranked. In their petroleum system, the Talu Shale is the sealing bed, the sandstone of Peiliao formation is the reservoir, and all the hydrocarbons have been matured. These study results were finished by the analysis of geological map, field work, geological section constrain, modification of previous sections and the delineated one- thousandth sections passing through the drilled well.The best potential high (A) is an isolated blind anticline which located at Chutung structure and just beneath the Chutung fault. Several situations were verified to be highly potential including: (1) the genetic time of this blind unit is closed to that of Chuhuangkeng anticline and considered to be matched with the hydrocarbon migration and accumulation, (2) the structure is located at the intersection of Pokungping, Toufinglin, and Juanchiao faults which display the largest amount of deformation and horizontal slip in this area, (3) based on the magnetotelluric exploration, the structure possessed an extremely high resistivity rather than its surrounding areas while the morphology is almost fit with an anticline, (4) after the 3D modeling, it was verified that position just beneath the well sites of CTU-24 and CTU-25 exists a large blind anticline. This antiform unit possibly supplies the hydrocarbon to the shllow Chutung anticline. The multilayer producing of Chutung anticline reservoir is also proved this vertical migration feature, (5) this high has good up sealing due to locate at the sub-thrust of Chutung fault.The second potential high (B) is an anticline located at Fanpokeng area and also beneath the Chutung Fault and near the well sites of FPK-3 and FPK-5. Many structural characteristics of this anticline are similar to those of potential high (A). But, this high is intersected by Chuhu fault in the southern side, resulted in the vertical release of hydrocarbon. If there is four-direction closure, the potential will largely increase. Several reasons point out this structure including: (1) the shallow Fangpokeng anticline is plunged to the southwest, (2) the position is at the curvature of Juanchiao fault and meets with the Taping fault, (3) at the curvature of Chuhu fault.The third potential high (C): (1) the site is located at the hanging wall of Chutung fault. The reservoir of this structure posses abundant fractures while the thickness of Talu sandstone is about 25 meter, and most of sandstone was replaced by limestone, (2) the site is located at the footwall of Juanchiao fault, (3) its site is matched with well CTU-25. The result is unknown due to the drilling hazard.The fourth potential high (D) is near FPK-3, (1) FPK-3 was drilled to the top limestone layer of Talu Shale, therefore there is a chance to drill deep to the underlying sandstone of the Peiliao formation, (2) Fanpokeng anticline is a fault-propagation fold. The Chuhu fault is back-thrusting along the front limb of this fold at the 1,255 meters depth of the Tungkeng formation. Therefore, it would be found the hydrocarbon at the footwall of Chuhu fault while previous exploration was focused on the hanging-wall, (3) at the hanging-wall of Chutung fault, (4) at the footwall of Juanchiao fault. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。