• 作者： 湯振輝
• 作者服務機構： 中國石油公司臺灣油礦探勘處
• 中文摘要： 打鹿頁岩於新竹苗栗區西部平原地下，其厚度在200至350公尺間，岩性上可分為上部頁岩與下部砂岩兩段，下部砂岩段係由十層左右，，中至粗粒砂岩夾以灰色薄曆頁岩而成，此砂岩乃為臺灣目前擁有最大蘊藏量的所謂打鹿儲油砂岩。由砂岩之性質與砂體之型態及其分佈狀態觀之，下部砂岩段可能屬於三角洲前綠部之推積物(delta front deposits)。而此三角洲乃由發源於福建高地之古河流向東南搬運而來之碎屑物在入海前由於流速之減緩而推積於河口附近所造成，並以白沙屯氣田一帶為其沉積中心(depocenter)。打鹿砂體由此沉積中心分別朝向東側沉積盆地尖減或變遷為頁岩。在三角洲沉積環境中，經由沉積旋迥而生成之早期碳氫化合物，想必由沉積盆地移聚於三角洲前緣部之扁豆狀砂體。過去於背斜構造封閉之打鹿砂體鑽獲輝煌之成就，今應以打鹿砂體本身因岩相因素而造成之地層封閉為目標而鑽探。夾於錦水背斜與通霄—鐵砧山背斜中間為一長緩且寬潤的銅鑼向斜。發育於此低窪區以及沿其東翼一帶之打鹿砂體實為本區鑽探地層封閉之一理想地區。
• 英文摘要： The Talu Shale, with its thickness ranging from 200 to 350 meters near Hsinchuand Miaoli underneath the western coastal region, can be lithologically divided intothe upper shale and the lower sandstone members. The lower sandstone memberis composed of multistoried coarse- to medium-grained protoquartzitic sandstone inabout ten beds, which are separated from one another by intercalated grayish shalebeds or partings. This multistoried sandstone, known as the most prolific TaluSandstone reservoir in Taiwan, are divided into four zones, a, b, c, and d, in decend-ing order. The depositional environment of the Talu Sandstone member is regarded as ofthe delta front fades. The possible delta front sands, with the depocenter locatedin the present day Paishatun field west of Miaoli, are likely to be river mouth barsfed by the Paleo-river which flowed generally to the east or southeast from theFukien Upland. The mufti-story zones of the Talu Sandstone pinch out from the depocenterbasinward. The possible up一dip or up一structure terminations, resulted from thecombination of the basinward pinchout and the synchronous folding up of the Chin-shui and the Chiting structures, are solely responsible for stratigraphic trapping.The prospects for the potential stratigraphic trap in the Talu Sandstone reservoiralong the axial part or eastern flank of the Tunglo synclinal belt look bright.
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