Abstract In many oil fields, because of the limitation of geography, humanity conditions, seismic method is impossible to use in oil exploration. In other areas such as where volcanic rocks present then the quality of seismic results will be affected. To solve this problem, a new method called "Optimum Constrained Inversion Method (OCIM)" has been developed. Based on data of constraint area, seismic or drilling, the optimum approach theory can be applied through a optimum fitting function. If the primary parameters of the inversion area are given, rapid iterative inversion can be carried out with OCIM for the detail structure of the inversion area. OCIM can invert the depth of layered structure and opening distribution between layers used in potential field data. According to OCIM, the 3-D tomographic image for density distribution on oil deposit can be obtained and enlarged by filtering the wavenumber-frequency domain. If the variable values of potential field with time can be monitored, we can obtain the 4-D tomographic structure image or tomographic density distribution image according to OCIM, so that one can use to evaluate structure hazards and avoidance of tectonic hazards during drilling and oil/gas production. This paper also discuss the Accuracy, uniqueness and influence factors of OCIM.
Introduction Exploration of oil and gas has been the essential task in the petroleum industries. The central work of exploration is the effectiveness, economics and the degree of risks when some methods are considered to use in a area where the exploration is to be done. Because seismic method is the most expensive one, how can we effectively utilize other less expensive nonseismic synthetic geophysical interpretation methods has attracted more and more attention in the petroleum industry. Because of new inventions in theory and technique, and especially the widely use of computers in data processing, some non-seismic method have been enhanced greatly, not only in the settling of the accuracy of petroleum problem in early exploration stage, but also in accurate digital modeling in petroleum development stage. It has complemented and even replaced seismic method to some extent.
The optimum approach theory. The basic idea of this optimum approach is to assume that seismic data and drilling data are available in the periphery of the inversion area. A fitting function is made based on available information. We can get the fitting depth of the interface of the structural layer including the inversion area, which can be the basis of stripping vertical stacking potential field and then became the starting values for rapid interactive inversion of potential field anomaly.
The optimum approach theory. The basic idea of this optimum approach is to assume that seismic data and drilling data are available in the periphery of the inversion area. A fitting function is made based on available information. We can get the fitting depth of the interface of the structural layer including the inversion area, which can be the basis of stripping vertical stacking potential field and then became the starting values for rapid interactive inversion of potential field anomaly.