Well Logging Evaluation Technology Of Carboniferous Igneous Rocks In The Northwestern Margin Of Junggar Basin

Igneous reservoir is a special type of oil and gas reservoir,has become one of the most important exploration targets.The complex lithology,reservoir space types,pore structure and strong heterogeneity,which brings great difficulties to the igneous rock reservoir lithology identification,reservoir effective evaluation and fluid identification evaluation.Aiming at the characteristics and logging evaluation difficulties of the west Junggar basin of igneous rock reservoir,the lithology identification plate of igneous rock and the identification model of rock texture was established for the first time,by Using 2D 3D crossplot and FMI data,based on the analysis of logging,geological,rock physical experiment and test data of the block.All of the Conventional logging,electric imaging,nuclear magnetic resonance logging and elemental capture spectroscopy logging data were used to calculate the rock parameters and fracture parameters,such as porosity,permeability,etc.On the basis of analyzing the logging response characteristics of alteration zones,the alteration index was constructed to quantitatively determine the intensity of alteration.We Combined with Multipole array acoustic logging data to evaluate effectiveness of reservoirs and established criteria of reservoir quality.P1/2 method,resistivity and porosity cross plot were used to identify reservoir fluid layer properties.Among them,the Fisher discriminant method significantly improved the ability of logging data to identify the fluid properties of igneous reservoirs.Through the research,we achieves the expected goal.This method was used in evaluation of Carboniferous igneous rock reservoirs in the Northwest margin of junggar basin,greatly improved the accuracy of lithology identification and interpretation accuracy for oil and gas.It has important guiding significance to the exploration and development of this area.