2013-01-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/704467摘要：目前許多世界重要的油氣田的儲油能力與其裂縫的發育及分布有關，儲集層之裂縫 評估是世界油藏評估的重要趨勢之一。至目前為止，新竹苗栗地區斷層作用形成的褶皺 構造中裂縫儲集的分布並不清楚，同時在前陸盆地的油氣潛能區，評估儲集岩特性亦是 重要的議題。在本研究中，我們將針對並探討斷層所形成的一序列背斜構造中的裂縫儲 集之幾何分佈，以瞭解西部麓山帶逆衝斷塊的運動和斷層幾何形狀的改變，所造成油氣 儲集的演育。本研究預計GeoSec 3D 軟體重建研究區的平衡剖面，平衡剖面的資料約制 來源主要有震測剖面和地質資料，可以鈎勒出逆衝斷塊和相關摺皺構造的形貎；同時利 用鑽井資料，瞭解逆衝斷塊及其沉積物的厚度，並且和野外露頭及參照現有的地質圖。 進一步利用三維顆粒流離散元素法(PFC3D)研究斷層折彎褶皺和斷層擴展褶皺的演育 過程，瞭解平均應力梯度的變化對油氣儲集變遷的影響。經由對褶皺從初始至成熟期各 個階段的演化，並將其轉換為三維離散元素模型，以分析褶皺發展時的應力及應變集中 的分佈區域。要能推算趨動力和流體移棲之間的關係，必須分析離散元素在各平衡階段 的平均應力分布。此外斷層擴展褶皺發展時的同構造沉積，亦可由擴展前端的前翼及後 翼的最大平均應力異常來預測。最後，我們將用不同的模型來推算裂縫儲存的分布，將 已建構之地質模型，進行應力分析及裂縫模擬，預測裂縫之產狀，將應用於造山帶背斜 構造或前陸盆地之裂縫油藏評估。 <br> Abstract: The assessment of fracture reservoir in potential oil-gas field fracture reservoir is an important topic. The fractured reservoir in Hsinchu and Mioali area due to the evolution of fault-related folding is unclear. In addition the assessment of possible fracture reservoir in foreland basin around Taiwan is also a crucial topic. In this study we aim at characterizing the pattern and distribution of fracture reservoir in a series of anticlines forming by propagation of faults. In order to determine the geometries and kinematics of the thrust sheets in the western Foothills at the time of oil migration, we will construct several balanced cross-sections from the western Foothills to coastal plain in Taiwan by GeoSec 3D. Data constrains for balancing is provided by reflection seismic profiles and geological data, thus the geometry of major thrust sheets and related fold structures could be imaged. In addition, the borehole data are also used to constrain the thicknesses of thrust sheets and thickness of involved sediments) and outcrop data from available geological maps. In order to understand oil migration driven by mean stress gradients, we study a set of 3-D distinct element model of fault-propagation and fault-bend folds. Model geometries describing different stages of fold development are made by forward balancing from undeformed strata to most mature folding stages using GeoSec 3D. The mechanical properties are estimated by transferring the various balancing stages into the distinct-element, analyzing for stress field perturbations and strain localization during the fold growth. Analysis of the distinct-element modeling results focused on the mean stress distribution in relation to different fold-and-thrust geometries and balancing stages, respectively, in order to assess the driving force for fluid migration. Furthermore, fault-propagation fold scenarios with syn-tectonic deposition will be predicted based on the maximum mean stress anomaly in the advancing side of the propagating ramp tip and the receding side of the propagation ramp tip. Finally the propagation of fracture reservoirs could be assessed in different models.三維顆粒流離散元素法平衡剖面GeoSec 3DPFC3D三維顆粒體離散元素法模擬儲集岩特性和裂縫儲存之評估(II)