本文選題：水壓致裂 + 修正HTPF法�。� 參考：《巖土力學》2017年05期

【摘要】：HTPF法測試所需的數目眾多的原生裂隙面大大制約了這種方法的推廣應用。針對這一問題,通過為原生裂隙面上廣泛存在的剪應力建立力學方程,利用最小二乘法和計算機程序試錯搜索原生裂隙面摩擦系數的辦法反演原地應力張量。理論上基于每個原生裂隙面的水壓致裂測試結果可以建立兩個力學方程,那么只需要3條原生裂隙就可以求解原地應力張量,但為了保證計算機程序反演收斂,至少需要5條原生裂隙,這一方法被定名為M-HTPF法。將這種方法在山東某科研鉆孔的原地應力測量作業(yè)中進行了應用,通過利用5條原生裂隙面上的水壓致裂測試得到的關閉壓力和方位角數據,反演得到原地應力張量:σ_1=8.85 MPa,方位角為N58.12°W∠14.18°;σ_2=6.61 MPa,方位角為N26.2°E∠-21.54°;σ_3=5.01 MPa,方位角為N62.86°E∠63.86°。通過與同一鉆孔內的經典水壓致裂法的測量結果對比可知,兩種方法得到的最小主應力和中間主應力非常接近,最大主應力則相差較大;兩種方法獲得的最大、最小主應力方位角基本一致。該方法為單孔三維水壓致裂原地應力測量提供了新的思路和途徑。
[Abstract]:The application of HTPF method is greatly restricted by the large number of primary fracture surfaces. In order to solve this problem, the mechanical equation is established for the shear stress widely existing on the primary fracture surface, and the original stress Zhang Liang is retrieved by using the least square method and the computer program to search the friction coefficient of the original fracture surface. Theoretically, two mechanical equations can be established based on the hydraulic fracture test results of each primary fracture surface, and only three primary fractures can be used to solve the in-situ stress Zhang Liang, but in order to ensure the inversion convergence of the computer program, At least 5 primary fissures are required, and this method is called M-HTPF method. This method has been applied to the in-situ stress measurement of a scientific research borehole in Shandong Province. The closing pressure and azimuth data obtained from the hydraulic fracturing test on 5 primary fracture surfaces are used. The in situ stress (Zhang Liang) is obtained as follows: 蟽 _ S _ (1) 8.85 MPA, azimuth is N 58.12 擄W ~ (18) ~ 14.18 擄, 蟽 _ S _ 2 is 6.61 MPA, azimuth is N _ (26.2 擄E) -21.54 擄, 蟽 _ 3 is 5.01 MPA, the azimuth is N _ (62.86) 擄E ~ 63.86 擄. By comparing with the results of the classical hydraulic fracturing method in the same borehole, it can be seen that the minimum principal stress and the intermediate principal stress obtained by the two methods are very close, the maximum principal stress is quite different, and the maximum principal stress obtained by the two methods is the largest. The minimum principal stress azimuth angle is basically the same. This method provides a new idea and approach for measuring in situ stress of three dimensional hydraulic fracturing with single hole.
【作者單位】： 中國地震局地殼應力研究所;中國地震局地殼動力學重點實驗室;廣東省地質科學研究所;
【基金】：國家自然科學基金資助項目(No.41274100) 中央級科研院所基本科研業(yè)務專項資助項目(No.ZDJ2012-20)~~
【分類號】：TU45

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