The Research Of Data Processing And Interpretation For Cased Hole Reservoir Parameters Logging

After oil field production development, how to seek for the oil gas level, the monitor remaining oil change, the observation performance of the reservoir and the determination reservoir remaining oil degree of saturation directly in the cased well stratum becomes in the oil field production performance history a very important link. At present, the nuclear oil well logging method that surveys the remaining oil degree of saturation in the case well mainly to have the carbon oxygen ratio, the neutron lifetime, the neutron-neutron logging, but each oil well logging method respectively has oneself to be suitable the condition, the merit and the shortcoming. Cased reservoir parameter logging instrument has the carbon oxygen ratio logging, the pulse neutron capture logging and the pulse neutron-neutron logging three kind of patterns, through to the complete well logging information which obtains carries on the data processing and the integrated interpretation, can use each well logging method fully the merit, overcomes the single well logging function the shortcoming, enhances the case well formation parameter oil well logging the explanation precision and the coincidence rate.To exclude sampled data exceptionally, we may select the first-order method of difference, the multinomial approximation generally and the least squares method. Between them the difference is only in the algorithm which lies in elects, other consideration method is approximately same. In this paper, the specificity of pulsed neutron logging, the use of spectrum in the time of the first-order difference method to check abnormal data, reduces the statistical error curve.The definite stratum macroscopic capture cross-section convention method has the window to count ratio law and the logarithm fitting law. The window counting ratio law must consider the windowing time width, if the windowing time is narrow, the information use factor is low, the computation obtains or the statistical fluctuation is big, if the windowing time is wide, affects easily the background puts. The logarithm fitting law must remove the background first, but the usual background size is very difficult to determine. In view of above two method's shortcoming, this research proposed fast Fu transforms the fitting method determination stratum the macroscopic capture cross-section, this method's merit is not affected the background, the information use factor is high, the simulation computed result indicated that obtains sandstone stratum thermal lifetime standard deviation for logarithm fitting method 1/5, moreover the data use factor is high.The well logging high resolution processing technology has methods and so on deconvolution method, a factor method, match law, regarding neutron lifetime's high resolution processing, this article in studies in near far detector correlation of bore-hole diagrams foundation, used the match law, the application high resolution bore log has carried on the match to the low bore log resolution, has achieved the quite good application effect.This research has given 7 computation shale content convention universal method, should regard the actual situation choice computation shale content method in the practical application, considered that the porosity computational method the versatility and the usability, the choice sound wave, the density, the neutron, the neutron population four method computation stratum gross porosity and the effective porosity, and have carried on the explanation to the actual carbon oxygen ratio oil well logging data, through use well completion material computation shale content, porosity and use carbon oxygen ratio material computation water saturation and core analysis compared to right, has confirmed the carbon oxygen ratio explanation model correctness.The logging information of uncased hole convention asks the shale content is mainly the natural gamma law and the spontaneous polarization method, the natural gamma law asks the shale content the stratum radioactivity unusual influence, the spontaneous polarization method asks the shale content the oil layer postflood baseline wander influence. This article studied the formation macroscopic capture cross-section which using the pulse neutron lifetime, the pulse neutron-neutron logging obtained to calculate the stratum shale content, has overcome the open hole well logging above two shortcomings, regarding lacked the open hole log information the well, this was one good shale content computational method. But the neutron lifetime log is been big formation water salinity's influence, in the high hardness index stratum, the macroscopic capture cross-section value which obtains increases, the shale content which extracts is high.The porosity erroneous size affects in a big way to the neutron lifetime computation degree of saturation's error, must therefore select earnestly. When has the core analysis material, best application core analysis porosity; If does not have the core analysis material, may use bare hole log information and so on sound wave, density, neutron, if the bare hole log information and the core sample material do not have, may use the neutron lifetime pattern oil well logging data computation formation porosity the method, according to the neutron lifetime log material near, the far detector capture count rate compares the computation formation porosity.May use the carbon oxygen ratio and the neutron lifetime log group and the explanation regarding the bare hole oil well logging data not entire well. The concrete explanation principle is: Capture curve seeking shale content which provides using the neutron lifetime log, near, the far detector capture total count compares the seeking porosity; Unifies neutron lifetime's capture curve and the carbon oxygen ratio's silicon calcium compared to the curve carries on the reservoir to divide.This article has studied carries on the integrated interpretation using the neutron-neutron and the neutron lifetime log material, has the very good corresponding relationships according to the neutron lifetime and the neutron -neutron record's count rate and the stratum permeability, can thus appraise the stratum permeability, divide the reservoir accurately, When in the stratum includes the natural gas, stratum macroscopic deceleration capability and absorbance compare the perquisite level to drop, the thermal neutron arrives at detector's number to on the other hand compare Gamma the prong number height of eye. Therefore the neutron lifetime record's long source-detector separation count rate and the neutron-neutron record's thermal neutron total count rate superposition demonstration is"the negative anomaly", uses this characteristic to be possible the very good appraisal aerosphere.