Deep Natural Gas Layer Logging Evaluation Method And Technology Of Qaidam Basin

In recent years,along with our country energy demand structure changes and the rapid development of gas industry,natural gas occupies more and more important in the energy structure.Qaidam basin resources potential is tremendous,but resources and production distribution is very uneven.Qaidam basin is a typical continental sedimentary basins,the sedimentary environment is complicated,complex reservoir,heterogeneity is strong,the exploration difficulty is big,e deep 1 well and tai deep 1 well have seen good gas show,but failed to obtain high yield industrial air,confirmed that there are many technical difficulties in the exploration of deep exploration to research,especially the deep natural gas layer identification and evaluation technique has become one of the key bottlenecks technology of qaidam deep natural gas exploration.Relative to the eastern shallow gas layer,deep natural gas layer identification and evaluation faces many difficulties,reservoir burial depth,formation pressure,mud invasion,under the condition of complex borehole logging data acquisition is difficult,logging response solution and enhanced.Due to the deep natural gas layer has a poor reservoir property,mineral elements,strong heterogeneity,complex large difference of diagenesis,low matrix porosity,fracture development and complicated pore structure and other characteristics,can not fully reflect the size of the porosity of deep natural gas reservoir is good or bad,is influenced by pore structure,porosity and permeability is nonlinear relationship,is not easy to accurately calculate reservoir parameters,effective reservoir identification difficult,resistivity under the influence of reservoir lithology and pore structure than fluid properties,greatly reduces the well logging information to the resolution of the pore gas,fluid identification is difficult.This study in order to study the structure of the region as the key research area,the reservoir lithology recognition,physical property parameters calculation,fluid property and mud invasion correction as a major breakthrough,carry out in-depth study.In regional geological background,rock physics experiment and research on the basis of logging response characteristics,according to the cores,thin sections and well logging data,the lithology and rock mineral composition and reservoir property study,this paper carried out a deep lithologic identification methods,chaidamu basin reservoir physical property parameter calculation method and gas logging identification method,and obtained good application effect.