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利用井下電測資料與蒙地卡羅法估算地層強度參數之研究

Estimation of Formation Strength Parameters Using The Well Log Data and Monte Carlo Method

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:第一種模式爲『整層分析模式』,是考慮生產層内(以整個砂岩層爲單位)各參數之變異性,計算地層強度參數。第二種模式爲『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爲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層内的生產層(1Aa)之井下電測資料,利用井下電測資料估算地層強度指標。本研究綜合各項不確定性分析模式後認爲,X2井之1Aa層屬於強地層,其出砂可能性相當低。

並列摘要


The purpose of this study is to estimate formation strength index (the ratio 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. From the results obtained, M-X2-1A-1Aa is a strong formation and possibility of sanding out is very low.

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