Geochemical Logging Evaluation And Application Of No.4 Structure In Nanpu Oilfield

Nanpu 4th Structure is the key area for exploration and production in Nanpu depression.The relationship between oil and water in the reservoir is complex and the fluid property is difficult to identify.Now,the only use of well logging data for reservoir fluid interpretation was on the low side.Quantitative evaluation based on geochemical theory was a new method in the last decade,which was a supplement and development of logging,and played an increasingly important role in oil exploration.However,the technology with high coincidence rate of actual oil-water layer was still under exploration.Based on the analysis of the current status of geochemical logging technology research at home and abroad,the original data of 15 Wells were tested and collected by using three logging technologies: rock pyrolysis,thermal evaporation hydrocarbon gas chromatography and headspace analysis of light hydrocarbonsthe.Based on the calculation of the original parameters,5 pyrolysis parameters,5 chromatographic parameters and 8 light hydrocarbon parameters were obtained,three charts of pyrolysis,chromatography,and light hydrocarbons were drawn by selecting parameters.The geochemical logging parameters of 23,20 and 21 new wells were used to verify the application rate of each plate.Finally,the three charts were combined to predict and verify the reservoir fluid.The analysis selects 16 parameters that directly judge the oil-water properties of the reservoir,2 sets of pyrolysis charts,3 sets of chromatography charts and 4 sets of light hydrocarbon charts were drawn by using Excel,and the fluid oil-water properties of 53 perforating layers in 23 wells were evaluated.The results showes that the actual compliance rates of the three charts reach 84.9%,84.0% and 82.0%,which exceed the requirement of 75.0%,indicating that the three geochemical logging charts could be used to evaluate the reservoir properties in real exploration.To further improve the rate,firstly combining the three kinds of charts in mutual authentication,the coincidence rate reaches 95.56%,compared with the single chart evaluation increased by 10.7%,11.6% and 13.6%,which provides a new way of thinking for the development of geochemical logging technology.Figure 30;Table 16;Reference 76...