利用测井资料分析计算东海平湖油气田地应力

利用测井资料研究平湖油气田的地应力,对平湖油气田低渗透储层压裂、钻井和开发都有重要意义。文中利用密度、自然伽马、交叉偶极横波测井等资料,对平湖油气田地层的岩石力学参数(泊松比、弹性模量、体积模量、剪切模量、抗压强度、抗剪强度和抗张强度)进行了计算;为确定地层压力和构造应力系数,借鉴前人的研究成果,分别应用黄氏和葛氏地应力计算模型,建立平湖油气田地应力计算方法,并通过岩心差应变法地应力实验验证了该方法的准确性;采用基于XMAC-Ⅱ快横波方位法确定的平湖油气田的地应力方向,与岩心波速各向异性法及黏滞剩磁法地应力实验确定的地应力方向吻合较好。

Using well logging data to calculate and analyze earth stress of Pinghu Oil and Gas Field in East China Sea

Using the well logging data,the earth stress of Pinghu Oil and Gas Field is studied,having very important meanings to the fracturing,drilling and development of low permeability reservoir.In this article,the rock mechanics parameters required for earth stress calculation are determined by using the data of density,gamma ray,XMAC-Ⅱlog,such as Poisson ratio,modulus of elasticity,bulk modulus and so on.In the determination of pore pressure and tectonic stress coefficient,the Huang and Ge earth stress model are used learning from previous research and the calculation method of earth stress for Pinghu Oil and Gas Field is established,which is verified by the earth stress experiment of core.The horizontal stress direction of target zone is determined based on XMAC-Ⅱfast shear azimuth method,which coincides with the result from the earth stress experiment of core by wave anisotropy and viscous residual field method.