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題 名 | 白沙屯及其附近地區儲集岩之地質模型=The Reservoir Geological Model of the Paishatun and Is Vicinity Area,Miaoli,Northwestern Taiwan |
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作 者 | 周學良; | 書刊名 | 探採研究彙報 |
卷 期 | 21 1998.11[民87.11] |
頁 次 | 頁45-53 |
分類號 | 457.2 |
關鍵詞 | 儲集岩立體地質模型; 精密地層對比新技術; 頁岩含量; 自然電位差電測; 3D reservoir geological model; Precision stratigraphic correlation technique; Shale contain; Self-potential well log; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究利用竹南、白沙屯、豐富及三湖等地區之十一口井打鹿頁岩(儲集層為打 鹿砂岩)之自然電位差電測圖,經電腦程式計算出各岩層的真厚及頁岩含量,做為發展精密 地層對比新技術的工具,建立儲集岩立體地質模型。 此模型分為上、中、下三大層,並再細分成 230 個薄層,而整個打鹿頁岩的真厚在 315 至 460 公尺間,故深度方向之解析度達 2 公尺以內。 為了展示此模型,作者切了三個連井線的剖面,在利用此立體模型之精密對比下,在十一口 井中找出六個錯誤的地層對比,並予以修正。另外也查出白沙屯四號井鉆深 3470 公尺處之 斷層應上移 11 公尺。 豐富二號井井下報告中,該井與白沙屯地區之地層對比仍有問題存在。其原因可能為該井在 打鹿頁岩中曾鉆遇斷層,但沒有被辨認出來。此有待進一步查証。 |
英文摘要 | The structural features of the foothills of northwestern Taiwan are typical of foreland fold and thrust belts developed within areas of recognized passive margin. In terms of basin characterization and tectonic evolution, inversion tectonics provides a favorable petroleum system for hydrocarbon accumulation. The foothills is a high potential area for short term or long range exploration for the hydrocarbon. A strategy for short-term exploration for the hydrocarbon in the foothills of northwestern Taiwan is to look for nearby structural traps of the discovered oil and gas fields of the Hsinchu-Miaoli area. Potential structures include: 1) structures related to deformation front in the coastal region of Chunan, 2) stratigraphic traps of the west flank of the Yunghoshan-Chinshui anticlines and the east flank of the Miaoli-Tiehchenshan-Sanhu structures, 3) structures associated with the Hsincheng thrust Paoshan anticline, Hsinchu county, and 4) sub-thrust structures of the Miaoli-Sanhu area. A strategy for long ragne exploration for the hydrocarbon in the northwestern Taiwan region is to evaluate structural styles and trapping mechanism of the discovered oil and gas fields in the Hsinchu-Miaoli area, and then to search for similar types of structures in the neignboring regions. There exist a few such potential areas with no production record and therefore higher risk. These areas include:1) southern Kuanyin high, Taoyuan, and Chungli structural paleoridges, offshore Chungli, 2) stratigraphic traps of the Talu Sandstone and Nanchuang Formation, northwestern side of the Tatushan structure, Changhua county, 3) up-dip pinchout of the Wuchihshan and Mushan Formations, southwest of Wangkeng, Changhua county and Tienchung, Yunlin county, 4) footwall of the Chelungpu fault, Pakuashan and Tienchung structures. After more than eighty years efforts in searching for the hydrocarbon in the foothills of western Taiwan, a large number of potential structures has been discovered. Remaining potential traps are either subtle structures or stratigraphic traps which are difficult to identify and/or evaluate. In order to explore these potential targets, we combine new ideas, e.g., inversion tectonics, with new techniques, e.g., non-flat surface pseudospectral pre-stack reverse time migration, to tackle this challenge. This study shows that sealing capacity of the faults is closely related to geometry of the fault zone, fault throw, mode of fault displacement, diagenesis of fault zones and surrounding rocks, and shale smear factor. A study on the sealing characteristics of the Hsinchu fault of the Chingtsaohu gas field and the Lungkang fault of the Paishatun gas field suggests that sealing capacity of the faults has a reverse relation with shale smear factor. This relationship should also hold true for fault-sealing capacity of other structures of the foothills. Structural features of Taiwan has undergone a few important deformation events, especially the Plio-pleistocene Penglai orogeny, which causes basin inversion and overprints original extensional faults with compressive thrusting. Recent studies show that a large number of traps in the foothills of western Taiwan are related to inversion tectonics. This recognition of inversion tectonics provides an insight for reinterpreting structures of the area and has a far reaching effects on the future hydrocarbon exploration of the region. The foothills of northwestern Taiwan are represented by a series of rolling hills and mountains. This foothills region belongs to the fold and thrust belt of the Taiwan mountain belt, and is overlain by a thick Quaternary sediments. Especially in the Taoyuan-Hsinchu-Miaoli area, the poorness of seismic records caused by the covering of late Pleistocene thick tableland gravel in the near surface has made the poor quality of seismic sections. To improve the deficiency, the techniques of non-flat datum pseudospectral post-stack reverse time migration as well as non-flat surface pseudospectral pre-stack reverse time migration have been developed to enhance the accuracy and reliability of depth migration. The development of this technique will directly give the large contribution to hydrocarbon exploration. |
本系統中英文摘要資訊取自各篇刊載內容。