The Research And Application Of Formation Element Capture Spectrometry Logging Technology

The formation element capture spectrometry logging technology has a very significant application effect in the reservoir evaluation of complex lithology.This technique can be used to obtain the density of igneous rock,to understand the lithology of carbonate,and to accurately calculate the porosity and other data.Therefore,it has great significance in the research on reservoir evaluation.At the moment,Litho Scanner and ECS instruments are mainly used to complete the reservoir evaluation of complex lithology in In Daqing Oilfield.In order to get rid of the dependence on foreign technology and equipment,the research is done based on Self-developed formation element logging technology and use the experience in research and development of Pulsed neutron logging technology.In this article,the research work on the correlation logging technology of formation element capture spectrometry is mainly carried out from three aspects: the research of logging technology,Logging data interpretation processing method and Field application of the research results.In the study of well logging technology,we carried out the overall design of the test instrument,emphasized on optimal design of instrument sensor and neutron burst timing,processed method of energy spectrum noise reduction by comparing and analyzing.In addition,a number of improvements and improvements have been made in the comprehensive processing of dual-source data.In the data interpretation processing method,we pretreated the data of formation capture energy spectrum from five aspects,such as Smooth filtering,energy calibration,drift correction.We also used the method of least square method to solve the spectrum and determine the yield of the element,obtained the relative sensitivity by the calibration on the model well,determined the normalized factor by the oxide closure model,finally obtained the content of element weight,dry weight,skeleton property and total organic carbon content of the strata.In the field application of the research results,we did the targeted selection and completion of the comparison test of 13 Wells.From those wells,we obtained the qualified logging data.The data which obtained from the field proved that the stability,repeatability and consistency of the logging instrument have achieved better results,the capture spectrometry logging technology can meet the test demand in different logging modes.