Study On Logging Evaluation Of Niudong Glutenite Reservoir

With the deepening of exploration and development of various oil and gas reservoir resources,the exploitation of oil and gas reservoir resources has gradually decreased,but people's demand for energy has always been gradually increasing.In recent years,subtle oil and gas reservoirs represented by glutenite reservoirs have attracted much attention.Glutenite reservoir has the characteristics of large lithology change,diversity of pore structure and strong heterogeneity,so it is difficult to divide effective reservoir and non effective reservoir.It is difficult to accurately calculate the physical parameters of reservoir and the property of reservoir fluid,which leads to inaccurate geological modeling and reserve calculation in the later stage.Therefore,it is of great significance to carry out the logging evaluation research of Niudong glutenite reservoir.In response to the above problems,this article takes the Oligocene Lower Ganchaigou Formation(E3)glutenite in the Niudong area as the research object.Firstly,the geological data,core data,logging data,gas test conclusions and supporting petrophysical experiments of the study area are carried out.In summary,the logging response characteristics of glutenite reservoirs are obtained.It is found that the natural gamma and spontaneous potential logging curves of the Tertiary formation are difficult to correctly identify effective reservoirs.Based on this,a method for superimposing the acoustic jet lag curve and the deep induction resistivity curve is proposed.Secondly,after the logging data is preprocessed,the reservoir physical parameter modeling is carried out.Aiming at the problem of poor porosity and permeability in the study area,the permeability model is established by the granularity method,which improves the calculation accuracy of permeability.At the same time,the lower limit of Niudong E3 reservoir was determined by integrating mercury intrusion data and core data.In the actual application process,due to the limited coring data,continuous mercury intrusion data could not be obtained.Three methods of NMR logging data conversion into capillary pressure curves were proposed,and the piecewise power function method was selected.Finally,in view of the poor performance of conventional logging data fluid identification,a combination of gas index,elastic mechanics parameters and discrete wavelet multi-scale energy spectrum analysis is introduced to identify fluids to achieve qualitative identification and quantitative calculation of reservoir fluids.Applying the method proposed in this article to the comprehensive logging evaluation of Niudong glutenite reservoirs has achieved good results in actual production,and has important guiding significance and application value for improving logging interpretation of glutenite reservoirs.