頁籤選單縮合
題名 | 海域某構造地層孔隙壓力及破裂壓力之估算=Prediction of the Formation Pore Pressure and Fracture Pressure Gradient in X Offshore Area |
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作者姓名(中文) | 黃瑞鴻; 吳沂全; 宣大衡; 吳健一; 陳養愚; 蔡錫麟; 張光宇; | 書刊名 | 鑛冶 |
卷期 | 41:3=159 1997.09[民86.09] |
頁次 | 頁53-65 |
分類號 | 457.4 |
關鍵詞 | 地層孔隙壓力; 破裂壓力; Formation pore pressure; Fracture pressure; |
語文 | 中文(Chinese) |
中文摘要 | 本研究成功地應用震測資料找出商合海域某構造預測地層孔隙壓力及破裂壓力之區域模式,用以估算該構造深部之地層孔隙壓力及破裂壓力,提供作為X-14號井在前套管及泥漿比重設計之參考依據。 嗣後於該井完成後,發覺預測之地層孔隙壓力與由鑽進中Dc指數及電測酒料等現場估算之地層孔隙壓力比較均尚能吻合,但由於受限於震測資料的解析度,因此較難準確預測高壓薄氣層之地層孔隙壓力梯度。另應用Hubber & Willis修正模式可預測無裂縫砂岩、頁岩之破裂壓力梯度,其Poroelastic常數α為0.7;Eaton法則可預測有裂縫砂岩之破裂壓之梯度。深部地層聲波電測之P波及S波速度可用來計算岩石之卜松比,且與實隨岩心之量測結果相近,不需修正。將來無論陸上、海域或國外探井應可依據本模式設計泥漿比重及套管深度,以降低鑽井漏泥及噴井風險。 |
英文摘要 | A prediction model for formation pore pressure and fracture pressure gradient in X offshore area from seismic data has been established in this study. We have used this model successfully to estimate the formation pore pressure and fracture pressure gradient for the casing and mud design before the drilling of X-14. It has been found most of the predicted formation pore pressure and fracture pressure gradient are close to those field data from DC exponent and well logging. Due to the limited resolution of the seismic data, it is not easy to predict the formation pore pressure of the thin abnormal high pressure zone well. Modified Hubber & Willis's model can be used to predict the fracture pressure gradient of non-fracture sandstone and shale formation. The poroelastic constant is 0.7. Eaton's model can be used to predict the fracture pressure gradient of fracture sandstone. The veloctiy of P-wave & S-wave from sonic log can be used to calculate the Poisson's ratio of deep formation. The Poisson's ratio from calculation is very close to the data from lab rock mechanics testing and does not need any correction. This model can be used to estimate the formation pore pressure and fracture pressure gradient for the casing and mud design for onland, offshore and international exploration well before drilling to reduce the risk of lost circulation and blowout during drilling operations. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。