Research On Logging Evaluation Method Of Glutenite Reservoir Of Baikouquan Formation In Fengnan Area Of ??Mahu Sag

Currently,the tight sandy conglomerate reservoir in Baikouquan fonnation of Fengnan region,Junggar basin has became key exploration formation for PetroChina Xinjiang Oilfield company.The sandy conglomerate reservoir has the following features:complex lithology,various types of rocks and large range of grain size.At the same time,the reservoir has various types of reservoir space and complex relationship between porosity and permeability.Due to the complex lithology,complex reservoir space and severe heterogeneity of Fengnan area,the logging response is poor.So,it is difficult for logging to identify lithology,evaluate the effectiveness of reservoir,calculate reservoir parameter and reservoir classification.Based on analysis the reservoir characteristic and using the conventional logging curve,well testing,logging date and rock physical experiment,the thesis work on the logging evaluation at four aspects:logging identifacation for lithology,reservoir effectiveness evaluation,reservoir parameter modeling and classifacation.Main results showing:?On the basis of the reference on national standard Classification,the rocks in Baikouquan formation will be reclassified.Based on lithology and petrollogic feature and their logging responses,the cross plot chart are established and a combined identifacation method is developed.?The sandy conglomerate reservoir in Baikouquan formation includes:coarse sandstone,fine conglomerate,small pebble conglomerate and large pebble conglomerate.Coarse sandstone and fine conglomerate are dominant reservoir lithology with the secondary of small pebble conglomerate and large pebble conglomerate.The results show that the lithologic distribution match the delta sedimentary rules.?Due to the severe heterogeneity of sandy conglomerate reservoir,using the core calibration of logging data to established the conventional reservoir parameter calculation models with different lithology.And water saturation is calculated by Archie formula with m and n determined by rock physical experiment.Meanwhile,extracting the pressure mercury sensitive parameters to quantitative characterization of pore structure.?Integrating theory with practice,the resonable cutoff values in the reservoir in Baikouquan formation are thus determined.(porosity6.93%,and permeability 0.155mD);At last,according the productivity index to classify the reservoir.This paper would propose a feasible method of lithology identification,reservoir effectiveness evaluation,parameter modeling and reservoir classifacation for Baikouquan formation,which is of great significance to improve the precision of logging interpretation.