利用测井资料来准确计算5个独立的刚性系数（C11、C33、C44、C66和C13）,以解决横观各向同性快地层最小水平主应力的测井计算难题。通过声速各向异性及黏土含量实验测量,分析并建立了声波各向异性系数与黏土含量的函数关系及不同刚性系数之间的转换关系,在此基础上建立了一套利用测井资料计算各向异性快地层刚性系数及最小水平主应力的方法。实际应用表明,该方法与仅适用于慢地层的基于水平横波速度的计算方法互为补充,可用于评价致密油气储集层岩石力学参数,优选压裂试油层段。图8表1参25
刘忠华
,
宋连腾
,
王长胜
,
孙婷
,
杨小明
,
李霞
. 各向异性快地层最小水平主应力测井计算方法[J]. 石油勘探与开发, 2017
, 44(5)
: 745
-752
.
DOI: 10.11698/PED.2017.05.09
For transverse isotropic fast formations, the evaluation method of the least horizontal principal stress by using logging data is an important unresolved issue. An innovative method is proposed to solve this problem by derivation of five independent stiffness coefficients (C11, C33, C44, C66 and C13) in this kind of formation. Based on the functional relations between acoustic anisotropy coefficients and clay volume, and that between different stiffness coefficients, which are all approved by the assorted experiment data, an effective method is built to calculate the stiffness coefficients and the least horizontal stress of anisotropic fast formations. Successful applications in the Ordos Basin illustrate that the method is complementary to that based on the horizontal shear wave velocity which is only fit for slow formations, and is applicable to evaluating rock mechanical parameters of tight oil and gas reservoirs and selecting intervals for fracturing and testing oil.
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