CAJ | 학술논문

基于电磁场理论及三维有限元素法，提出一种用于模拟电成像仪器对裂缝响应的算法。该算法适用于电成像仪器在油基钻井液环境下对裂缝(包括水平裂缝、倾斜裂缝和交叉裂缝)响应的数值模拟。当裂缝张开度大于1 mm时，随着裂缝张开度的减小，裂缝处响应值也相应减小，算法对裂缝有较好的分辨效果；算法对裂缝的识别能力受背景地层与裂缝流体电阻率对比度的影响；仿真结果可以清晰地反映裂缝所处地层位置及方位角，对于倾斜裂缝，通过后续处理还可进一步获取裂缝倾角。
기우전자장이론급삼유유한원소법，제출일충용우모의전성상의기대렬봉향응적산법。해산법괄용우전성상의기재유기찬정액배경하대렬봉(포괄수평렬봉、경사렬봉화교차렬봉)향응적수치모의。당렬봉장개도대우1 mm시，수착렬봉장개도적감소，렬봉처향응치야상응감소，산법대렬봉유교호적분변효과；산법대렬봉적식별능력수배경지층여렬봉류체전조솔대비도적영향；방진결과가이청석지반영렬봉소처지층위치급방위각，대우경사렬봉，통과후속처리환가진일보획취렬봉경각。
Based on electromagnetic field theory and three dimensional finite element methods, an algorithm for simulating fracture responses of an oil-based drilling fluid electrical imaging tool is presented in detail. This algorithm can be applied to simulate the oil-based drilling fluid imaging tools responses to different types of fractures, including horizontal fractures, in-clined fractures and crossed fractures. When the open width of the crack is greater than 1mm, with the decrease of the width, the value of responses declines, and the cracks can be identified perfectly. The ability of the algorithm to identify fractures can be influenced by the resistivity contrast between the background and the fractures. These simulation results clearly reveal the positions and the azimuths of the fractures as well. Fracture dip can also be obtained for inclined fractures through follow-up treatment.