Study On ABC-CM Optimization Log Interpretation Method For Altered Medium Basic Volcanic Reservoir

In recent years,volcanic reservoirs have become another important exploration field because of the continuous improvement of exploration level and the decrease of total reserves of sandstone,carbonate and other reservoirs.As a supplement to conventional oil and gas resources,volcanic reservoirs are not only concerned by geologists,but also paid attention to by scholars of oil field exploration in china.However,volcanic rock lithology and reservoir type complex,deep buried depth,poor physical property and volcanic rock reservoir often exist alteration phenomenon,therefore,to carry out research on the logging evaluation volcano rock reservoir has not only theoretical value,but also has important practical significance.Conventional interpretation methods have some problems such as inadequate application of well logging data,flexible interpretation model selection and difficult evaluation of multi mineral complex formation.The conventional log interpretation method can't fully meet the logging evaluation of complex volcanic reservoirs.The optimum logging interpretation method is different from the conventional log interpretation method.The optimized logging interpretation method can integrate logging information,error and regional geological experience into a multidimensional information complex.By choosing the reasonable interpretation model and logging response equation,and then establishing the objective function of the optimized logging interpretation,an optimal solution is obtained within the allowable error range.Because of the alteration of the medium basic volcanic reservoirs in the study area,a certain amount of clay minerals are produced,so clay minerals should be taken into account in the volume model.Then,the volume model of medium basic volcanic reservoir is established,which contains pores,quartz,feldspar,dark minerals and clay minerals.In this paper,the ABC-CM optimization method is used to obtain the component content of volcanic reservoir in the study area.The study area is located in the W fault depression of the southern Songliao basin.Artificial bee colony algorithm is a new optimization algorithm,which provides a new method for optimizing logging interpretation of altered medium basic volcanic reservoirs.The actual processing of wells in the study area,the water saturation is calculated,and the results are consistent with the test conclusion.In this paper,main innovations include:From the micro parameter level,the lower limit of porosity and permeability of the medium basic volcanic reservoir in the study area is determined;Considering the alteration factors,the volume model of medium basic volcanic reservoir is established,which is pore,quartz,feldspar,dark mineral and altered clay mineral;In this paper,the artificial bee colony algorithm is combined with the complex algorithm to obtain the component parameters of the study area.