Inductive Logging Response And Probing Performance Analysis In Complex Formations

Nowadays, petroleum resource is one of the vital non-renewable energy and strategic energy in the world. With the strengthening of national efforts to detect oil and gas fields, the detection formation is becoming more and more complex, traditional induction logging has been unable to meet the needs of petroleum engineering. Based on the analysis of complex formation in inhomogeneous media, the main research is the electromagnetic modeling method based on the electric field integral equation of the layered, tilted anisotropic formations, solving integral equations by the moment method through iterative methods of GEMRES solved numerically, and through comparing the response to the results of the source of vertical dipole tilt electromagnetic dipole source in an inhomogeneous medium, analyzing the three-dimensional induction logging instrument of complex formation detection capability for logging data analysis and instrument design establish theoretical basis.Firstly, the basic principle of the induction logging and the numerical simulation method are introduced systematically. Then in the isotropy medium, a feature space exploration of geometric factor is deduced, which verifies that the three-dimensional induction logging instrument is superior to the traditional induction logging instrument is verified.Secondly, the basic principle of the volume integral equation for solving EM characteristics of a complex anisotropic target is introduced. Numerical method for solving such problem-Method of Moments (MOM) will be given. According to the equivalence principle, the volume integral equation is established; the SWG basis function is used to expand the equivalent currents in the medium; the Gauss numerical is used to solve the integral equation; Duff method is used to deal with the singularity of integral equation; then GMRES method is chosen to solve the linear equations iteratively.Thirdly, the transmitter coil approximation into magnetic dipole is studied in the induction logging instrument. Further, it is pointed out that the magnetic dipole tilt decomposed into horizontal and vertical magnetic dipole magnetic dipole combined to form a probe anisotropic formations, the method solves the vertical dipole difficult installation problems. By analytical expression of electromagnetic field excited by magnetic dipole source of arbitrary in the homogeneous uniaxial anisotropic medium, brought in concept of transmission tensor connecting field and source, then pointed out that multi-component induction logging was to measure the transmission tensor in instrument coordinate system. Based on this made a derivation and analysis to the forward response of the multi-component induction logging. And the formation model of different parameters on the impact of induction logging response is researched.In this paper, the logging response forward is studied. The response forward is the basis of the inversion (data interpretation).So the basic idea and process is also introduced.Through complex heterogeneous formations electromagnetic modeling, the use of electric field integral equation for the dipole tilt detection capability for heterogeneous media simulation analysis by the method of moments and iterative solver to obtain three-dimensional induction logging system in complex formation electromagnetic modeling, design and source emission detection performance can provide theoretical reference for the development of three-dimensional induction logging tool.