声发射与古地磁结合确定天然裂缝方向

Determining the Direction of Natural Fractures by Combining Acoustic Emission with Paleomagnetism

摘要: 当前水力压裂在油田中的运用越来越广泛，而储层中天然裂缝的存在影响了水力裂缝的延伸扩展方向，因此，储层中天然裂缝方位的准确描述对于确定水力裂缝形态，能否生成复杂裂缝，以及开发井井排方向的确定和井网的选择至关重要。为此，根据声发射试验得出标志线相对于地应力的方向，利用古地磁方法判定岩心标志线相对于现代地理北极的方位，确定了大庆长恒南部地区扶余储层中天然裂缝的方向。研究结果表明，声发射与古地磁结合得到的天然裂缝方向，与地层倾角测井曲线测得的结果较接近。

Abstract: The application of hydraulic fracturing in the oilfields was more and more extensive, and the ex-istence of natural fractures in the reservoir affected the extension direction of the hydraulic fractures. Therefore, the accurate description of the natural fractures in the reservoirs was of vital importance for determining the fracture morphology in hydraulic fracturing, the ability to generate complex fractures as well as the direction of well array and well pattern selection. Therefore, by combining acoustic emission with paleomagnetic experiments, according to the acoustic emission experiment, the direction of the marker line relative to the earth stress was obtained, and the direction of the rock core mark line relative to the modern geographical north pole was determined by the paleomagnetic method. The direction of natural fractures in Fuyu Reservoir in the south of Changyuan Area in Daqing Oilfield was determined. According to the acoustic emission experiment, the direction of the mark line relative to the geostress is obtained. The paleomagnetic method is used to determine the orientation of the core mark line relative to the modern geography. The results show that the direction of the natural fractures obtained by combining the acoustic emission and paleomagnetism is close to that of formation dip logging curve.