川东北山前高陡构造地应力精细计算方法

摘 要：川东北地质构造极其复杂，80% 以上都是山前高陡构造。复杂的构造条件给油气资源的勘探开发带来了极大的挑战，特别是对该区地应力大小、方向及展布规律的认识不清，给油气建井带来了很大困难。充分利用测井资料的连续性、经济性和高分辨率等优势，综合运用数理统计方法以及计算机综合成图技术，对该区的岩石力学参数和地应力进行了精细计算与研究，重点建立起适合川东北高陡构造的垂向应力离散分析模型以及水平应力精细求解公式。同时，提出了平均水平应力的概念和取值范围，并针对研究工区实际地质情况进行了深入计算和检验。所取得的成果大幅度提高了对川东北山前高陡构造地应力的计算精度和展布规律的认识

Fine Calculation Method Study of Crustal Stress of High-SteepConformation in Northeast Sichuan

Abstract：The northeastern zone of Sichuan is one of the regions that are rich in oil and gas resources discovered in China. Thegeological structures in this area are extremely complicated，80 percent of which are high-steep conformation. The complicatedstructure conditions have a great challenge for oil and gas exploration and development. Especially，the unclearly understand-ing of the magnitude，direction and transverse distribution law of crustal stress brings great difficulty in well construction. Thepaper，by making full use of the continuity，economy and resolution of logging data，and applying statistic methods and com-puter comprehensive mapping technology，calculates and studies the rock mechanic parameters and crustal stress precisely，primarily sets up the discrete analysis model of vertical stress and precise solution formula of horizontal stress. Meanwhile，the paper puts forward the concept and value range of average crustal stress，calculates and tests it in depth according to actualgeological condition of the work area. The results obtained greatly improve the understanding of transverse distribution lawand calculation accuracy of crustal stress in high-steep conformation of northeastern Sichuan，and，provides reference for thecalculation research on other same structures.