Application of 2D NMR Component Definition Method in Complex Shale Reservoir Evaluation
The core and experimental data in Qigequan-Shibei slope area of the Qaidam basin show that the E32 formation has the characteristics of complex lithology and rapid vertical variation,and its logging response characteristics are quite different from those of conventional reservoirs.This kind of reservoir has the characteristics of oil and water flowing together,and it is an urgent problem to accurately identify the fluid properties in well log evaluation.Due to the influence of lithology,physical properties and pore structure,conventional fluid identification methods,such as acoustic time difference and deep induction resistivity crossplot method,have limitations in the identification of such reservoir fluids.Two-dimensional nuclear magnetic resonance(2D NMR)and conventional logging are used to determine the fluid types of each component,that is,types of fluid components in large pores are determined by drawing the crossplot of deep induction resistivity and total water pore volume.This method is applied to determine the reservoir fluid properties of W2 well,a newly drilled well in the Qigequan-Shibei slope area of the Qaidam basin.We selected the perforated well segment for oil testing,and the oil production per day is 13 m3,which proved the applicability of this method in this type of reservoir.The new method overcomes the shortcomings of the original 2D NMR component definition method in fluid identification,and improves the accuracy of fluid identification in complex shale reservoirs.At the same time,this method can also be used for reference to other types of 2D NMR component definition.
log interpretationcomplex reservoirshale reservoirfluid identificationnuclear magnetic resonance loggingT1—T2 spectrumQiadam basin
万方数据
维普
