岩样核磁共振测井技术在SN地区储层评价中的应用

The Application of Rock Sample NMR Logging Technique for Reservoir Evaluation in SN Area

受沉积环境、沉积相带、成岩作用及构造作用的综合影响,SN地区阜宁组三段储层具有中低孔、低渗和低电阻率的特征,在核磁共振测井的横向弛豫时间(τ2)谱上表现为高束缚水、低可动流体的特点。通过试验数据建立束缚水饱和度与渗透率的关系,结合τ2谱形态特征,建立基于核磁共振τ2谱的储层分类标准,将该区复杂储层划分为5类。在该基础上,通过“一样三谱”τ2谱形态分析法和(含油饱和度/可动流体饱和度).含油孔隙度((So/Smw).φo)交会图版法识别流体性质,为SN及周边地区储层分类评价和流体性质判别提供了新的参考和依据。

Due to the combined effects of sedimentary environment,sedimentary facies belt,diagenesis and tectonic action,the reservoirs of the Third Segment of Funing Formation in SN Area have the characteristics of medium-low porosity,low permeability and low resistivity.It is characterized by high irreducible water and low movable fluid on the τ2 relaxation spectrum.Based on the experimental data,the relationship between the irreducible water saturation and the permeability is established.Combined with the morphological characteristics of the τ2 relaxation spectrum,the reservoir classification standard based on the nuclear magnetic resonance τ2 spectrum is established.The complex reservoirs in this area are divided into five categories.On this basis,the “three-spectrum”τ2 relaxation spectrum morphology analysis method and So/Smw .oil-porosity intersection chart boad are used to identify the fluid properties,which provides a new reference for reservoir classification evaluation and fluid property discrimination in SN and the surrounding areas.