岩性扫描测井技术在渤海复杂砂岩储层的应用

Application of High-definition Spectroscopy to Complex Sandstone Reservoir in Bohai Oilfield

复杂砂岩储层储量参数计算及流体识别困难,渤海A油田尝试应用岩性扫描测井技术。与元素俘获能谱测井利用中子俘获反应获取地层元素相比,岩性扫描测井(Litho Scanner)可通过中子非弹性散射反应获得Al、Mg、C等元素。岩性扫描测井能确定复杂砂岩储层矿物类型和含量,估算岩石骨架密度和计算孔隙度、饱和度等参数。利用岩性扫描测井计算得到的饱和度与基于常规电阻率测井计算得到的饱和度相结合,能够有效判别储层流体性质。岩性扫描测井技术为今后其他类似油气田的参数计算和流体判别提供了思路。

Because of the influence of rock types,physical property and oil-bearing on the complex sandstone reservoir which has characteristics such as high heterogeneity and various resistivity.Complex sandstone reservoirs are hard to calculate reserves parameters and identify fluid precisely.Therefore,there are some examples applying high-resolution spectroscopy logging technology in Bohai oilfield.Comparing with elemental capture spectroscopy logging which uses neutron capture interactions to detect formation elements,high-definition spectroscopy logging(Litho Scanner)can also detect extra elements such as Al,Mg,C,by neutron inelastic scattering interactions.In addition to determining the mineral types and contents of complex sandstone reservoir,high-definition spectroscopy logging can also estimate matrix density and calculate parameters such as porosity and saturation.Combination of saturations calculated by highdefinition spectroscopy logging and conventional resistivity logging can identify the reservoir liquid property effectively.This paper provides a train of thought of parameter calculation and fluid identification in other similar oil and gas fields.