Research On Correction Technique Of Porosity Logging Curves In High Angle Deviated Wells And Horizontal Wells

At present, with the further development of oil and gas field's exploration, ever detectionof new complex reservoirs and the urge demand of raise in both recovery ratio and theeconomic benefit of gas field's exploration.However, there haven't formed a faultless interpretation methodologies and software indeviation wells now, thus it seems essential to research interpretation methodologies indeviation wells. In practical application ,there are enormous differences of logging responsecharacters in deviation wells/horizontal wells and vertical wells ,these differences may causeunnegligible effects for the precision of geological application in deviation wells andhorizontal wells .According to the subsurface pictures of this block ,combined with relateddeviation, logging, geology and seismic data ,this essay is based on both the wireline loggingdata of 10 deviation wells in Bozhong Block and Jinxian Block and 15 evaluation wells' datain vertical wells ,analyze and look up a large number of papers ,summarize loggingenvironment affecting factors in deviation wells/horizontal wells and vertical wells ,including6 density logging affecting factors,5 acoustic travel time logging affecting factors and 10compensated neutron logging affecting factors.In all the affecting factors above, some are drawn by logging apparatus itself and loggingmethod principal characters, such as lithology, borehole diameter, mud density, salinity,temperature, mud cake and offset of compensated neutron logging and borehole diameter ofdensity logging and acoustic travel time logging .People have done much work in theseaspects and made various correction charts and then formed relevantly mature correctionapproaches, which are unnecessarily discussed here. Besides, some are drawn becauselogging apparatus enter the formation in a certain angle in deviation wells and horizontalwells' drilling process, such as formation anisotropy, formation boundary, asymmetry invasionand cutting bed. This essay mainly discusses affecting factors in deviation wells to the lattersituation.This essay uses multi-well acoustic data to correct acoustic claystone anisotropy; usesbulk model to correct invasion through fluid replacing method ;uses numerical simulation method to correct formation boundary in compensated neutron logging and densitylogging .Based on logging bulk model ,formation boundary correction of acoustic loggingcurves is realized .Based on curve reconfiguration ,claystone alteration correction isachieved .Cutting correction of compensated neutron logging and density logging isaccomplished through cutting correction charts which are obtained by numerical simulationmethod.This research has significant and irreplaceable meaning to the improvement of formationevaluation, the increasing precision of seismic reservoir predication and the advance ofseismic hydrocarbon detection .Logging data play a vital and irreplaceable role in log-bondseismic inversion and seismic formation demarcation and is the fundamental way to enhancelog-calibrating seismic precision.