Weak Signal Acquisition And Processing Research Of HDRT

Array induction logging is a conventional electrical logging method. In each oilfield, the array induction is used in almost every well. According to the realistic characteristics of Daqing Oilfield with high water content, and residual oil distribution is highly fragmented, there is an urgent need to develop thin layer array induction logging technology whose resolution can reach 0.2m. to meet high accuracy, high resolution, high reliability and complex oil and gas reservoir evaluation.This article mainly aims at the weak signal acquisition and data processing technology of ultra thin layer array induction logging, analyzes the research progress of related technologies in china and abroad and the existing problems. introduces the principle of array induction, about acquisition of weak signal, the coil design was improved, in order to improve the accuracy of error to reduce the temperature influence, in signal acquisition using a relative measurement model to suppress the temperature drift correction method; introduce the establishment of temperature correction model, research algorithm and self-adaptive borehole correction method, skin effect correction and the temperature effect correction; the part of the algorithm, carry out the research on software focusing algorithm, establish selected conditions of the focus function, calculat geometric factor under multiple background conditions, design a filter function with resolution matching, use the butterfly function to carry out the radial dimension inversion, make geometric factor database. Evaluate the data measured by the array induction instrument using the new method. The results show that the method has good repeatability and the resolution of 0.2 meters is achieved.