Study On Logging Evaluation Method Of Tight Oil Source Rocks In Santanghu Basin

Santanghu basin is a small basin of the edge of the Junggar large petroliferous basin.Lucaogou Formation is the main hydrocarbon source rock.However,because of Lucaogou Formation has some problems,such like difficulty to exploration,complex lithology,reservoir properties changes,especially in terms of the geochemical characteristics,showing both the sedimentary characteristics of marine,continental,bring bring difficulty to the oil and gas exploration.This paper carried out a study on logging evaluation method of tight oil source rocks in Santanghu basin,using well logging method to study the response of the source rocks of Lucaogou and Tiaohu formation.Do qualitative identification and quantitative calculation of the corresponding hydrocarbon source rock,and combined with the distribution of effective hydrocarbon source rock,explore the relationship between the allocation of Lucaogou Formation and Tiaohu formation preliminary.Lucaogou Formation has large differences in lithology,and the complex composition,lithology.According to the petrophysical and geochemical data of hydrocarbon source rock,we get,the advantages source rock of Niujuanhu structure is dolomite and shale,the Mazhong structure is the tuff.Relatively speaking,the hydrocarbon source rocks of Tiaohu group are poor quality,and the hydrocarbon source rocks are relatively simple,the mudstone and tuff.Compared with the non hydrocarbon source rock,the hydrocarbon source rocks is with high acoustic travel time,resistivity and neutron porosity and the smaller density.In this paper,based on the logging data,using discriminant functions method,cross plot and a lot of LgR can be used to identify hydrocarbon source rock.The improved ?LgR calculation method and calculation method of using electrical resistivity,porosity and multi information achieved good application effect on the TOC caculation.Combined with the template,the lower bound limit analysis of hydrocarbon source rocks can be done.we can determine the favorable source rock development zone is the second paragraph.Based on the actual production data and a comprehensive analysis of geological and seismic data,the reservoir distribution of Lucaogou formation and lake were obtained.