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題 名 | 井測法估算地層強度參數不確定性之研究 |
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作 者 | 李珣琦; 謝秉志; 吳健一; 林再興; | 書刊名 | 石油鑽採工程 |
卷 期 | 44 2003.12[民92.12] |
頁 次 | 頁124-132 |
分類號 | 457.8 |
關鍵詞 | 井測估算; 剪力模數; 容積壓縮度; 地層強度指標; 蒙地卡羅模擬; Well logging; Shear modulus; Bulk compressibility; Formation strength index; Monte Carlo simulation; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究目的是研究地層強度指標(剪力模數與容積壓縮度之比值)含機率性或不確定性之計算,其中,採用兩種不確定性分析模式:第一種模式為『整層分析模式』,是考慮生產層內(以整個砂岩層為單位)各參數之變異性,計算地層強度參數。第二種模式為『深度變化分析模式』,是考慮假設各種電測資料在每個深度點的不確定性或誤差機率分佈(假設的電測資料誤差機率分佈分別為三角形分佈及均勻分佈),計算地層強度參數。利用上述的二種計算方式所得之地層參數,也是含機率性或不確定性之值。 本研究分析M地下儲氣窖X2井1A層內的生產層(1Aa)之井下電測資料,利用井下電測資料估算地層強度指標。由1Aa層之整層分析模式計算結果為:地層強度指標高值(累積機率大於95%)為41.73*10□psi² ,中值(累積機率大於50%)為5.81*10□psi² 、低值(累積機率大於5%)為2.17*10□psi² 。深度變化分析模式計算結果:(1)假設各電測資料隨深度變化為三角形分佈,地層強度指標介於59.80*10□psi² 與2.14*10□psi² ;(2)假設各電測資料隨深度變化為均勻分佈,地層強度指標介於76.40*10□psi² 與1.67*10□psi² 。本研究綜合各項不確定性分析模式後認為,X2井之1Aa層屬於強地層,其出砂可能性相當低。 |
英文摘要 | The purpose of this study is to estimate formation strength index (the ration of shear modulus to bulk compressibility) by considering the uncertainty or variability of geological parameters. This study utilizes two approaches: whole formation analysis and depth-variation analysis. In whole formation analysis, the variations of well log data in whole formation are used to calculate the formation strength parameters. In depth-variation analysis, the uncertainty of well log data for each depth was considered to calculate the formation strength parameters. The triangular and uniform distributions are assumed to be the error probability distribution of the logging data. Well logging data of M-X2-1A-1Aa is analyzed in this study to calculate the formation strength index. In the formation analysis, the estimated formation strength index is ranging from 2.09*10□psi² to 47.73*10□psi² , with medium value of 5.53*10□psi² . In depth-variation analysis, the formation strength index is between 59.8*10□psi² and 2.14*10□psi² (when the triangular distribution is used). The formation strength index is between 76.4*10□psi² and 1.67*10□psi² (when the uniform distribution is used). From the results obtained, M-X2-1A-1Aa is a strong formation and possibility. |
本系統中英文摘要資訊取自各篇刊載內容。