Comprehensive Evaluation Of Reservoir Well Logging Of The Upper Submember Of Chunhuazhen Formation In Es4 In Tong-4 Area Of Shengli Oilfield

The main development of carbonate lacustrinebeach-bar deposits occurring at the Upper Chunhuazhen Submember of the forth member of Shahejie in Tong-4 area within Dongying depression in Jiyang depression.This area is not provided with qualitative evaluation standards for well logging data on physical property,oiliness,oil-water recognition methods and others.Through the study and analysis of lithology,physical property,oiliness,electric property and relations among “four properties” of various kinds of reservoirs in the destination layer,a suitable logging identification method and comprehensive evaluation technique are found to deal with the different types of reservoirs.By comprehensively applying geology,mud logging,oil and water testing,water analysis,well logging and other data,the research on relationship of "four properties" is carried out on the basis of understanding characteristics of “four properties”.Using the lithology of slice analysis as a reference and comparing the differences in well logging response characteristics,screening of log responses that are more sensitive to lithology makes a cross-plot and determines lithology identification criteria.The vertical resolution of lithology recognition is increased and the lithology identification method is improved.According to the principle of "calibrating static by dynamic",the relationship between well logging response of reservoir is systematically investigated.Then,reservoirs plates and standards as well as matrix porosity and permeability are established.Applying statistical method and test method gets the lower limit of the standard of the reservoir physical properties.The porosity of marl,siltstone and dolomite in the study area is calculated.The porosity and saturation identification standards of oil layer,water layer and dry layer in different lithologic reservoirs are determined by the technique of saturation-porosity cross plot.Through careful evaluation of the old wells and tracing and interpreting the new wells in the study area,the well logging interpretation standards are amended and the well logging interpretation accuracy is improved.After the second logging interpretation of new and old wells,it is clear that the main strata are marl and dolomite reservoirs.Based on the logging identification of reservoir lithology and the detailed evaluation of static parameters,the contour maps of thickness,porosity and(production layer)saturation of marl,limestone and dolomite reservoirs in the study area are plotted.The prospective areas for marl and dolomite are specified in the study area.