川西泥页岩地应力测井解释研究

Study on Terrestrial Stress Logging Interpretation of Shale in Western of Sichuan Basin

随着对页岩气的认识不断加深,压裂技术以及作为其支撑的现今地应力场的研究也逐步展开。本文用测井资料获得杨氏模量及泊松比,进而利用测井解释模型求取地应力,建立了单井地应力测井解释剖面。利用岩石声发射法(AES)、差应变法(DSA)、压裂法(HPF)等多种方法综合对比显示:测井预测值与实测值误差小,其方法适用于泥页岩地层。多种方法共同表明:须五段地应力满足:水平最大主应力>垂向主应力>水平最小主应力,属于走滑地应力类型压力系统。

With the development of the shale gas, basic research on hydraulic fracture and in-situ stress field characteristics is developing fast. In this paper, Young＇s modulus and Poisson＇s ratio were calculated by well logging data; the terrestrial stress was easily obtained with the logging formula（ADS）. Then the terrestrial stress logging interpretation section was built up. There are many other methods for research on the in-situ stress field characteristics, such as acoustic emission method（AES）, DSA method and fracturing method（HPF）. The features of terrestrial stress obtained by using different methods are very close. The logging method（ADS） is available in shale formation. All methods show that in-situ stress field satisfies with 〉σ maxσ v 〉σ min. It is a strike-slip pressure system in the fifth member of Xujiahe Formation.