CAJ | 학술논문

通过电镜扫描、压汞实验和铸体薄片分析，研究了水驱模拟实验前后渤海湾某油田中孔中渗储层的变化情况。实验表明，水驱前后储层物性的宏观特征、微观特征以及流体分布特征都发生了复杂的变化：水驱后储层平均孔隙度增加，渗透率在500.0 mD以上的样品水驱后渗透率增大，而渗透率在500.0 mD以下的样品水驱后渗透率变小；水驱后最大孔喉半径和孔喉平均配位数增加，而平均孔喉半径和汞饱和度中值半径却有不同程度的减小；水驱后中-粗岩砂岩（粒度中值大于1.5μm）储层平均孔隙直径和平均喉道直径增大，而细砂岩（粒度中值小于1.5μm）储层平均孔隙直径和平均喉道直径减小；水驱后储层微观均质系数减小、变异系数增大，储层非均质性增强；水驱后剩余油主要分布于颗粒表面、粒间孔边沿、微孔及喉道等水驱未波及到的部位。
통과전경소묘、압홍실험화주체박편분석，연구료수구모의실험전후발해만모유전중공중삼저층적변화정황。실험표명，수구전후저층물성적굉관특정、미관특정이급류체분포특정도발생료복잡적변화：수구후저층평균공극도증가，삼투솔재500.0 mD이상적양품수구후삼투솔증대，이삼투솔재500.0 mD이하적양품수구후삼투솔변소；수구후최대공후반경화공후평균배위수증가，이평균공후반경화홍포화도중치반경각유불동정도적감소；수구후중-조암사암（립도중치대우1.5μm）저층평균공극직경화평균후도직경증대，이세사암（립도중치소우1.5μm）저층평균공극직경화평균후도직경감소；수구후저층미관균질계수감소、변이계수증대，저층비균질성증강；수구후잉여유주요분포우과립표면、립간공변연、미공급후도등수구미파급도적부위。
With the samples of mid-porosity and mid-permeability reservoir from the oilfield in Bohai Bay,by scanning elec-tronic microscope,cast thin section and mercury penetration test,the changes of reservoir properties before and after water injection simulation tests were studied. The tests indicate that the macroscopic and microscopic characteristics of and flu-id distribution characteristics of the reservoir petrophysical properties changed complicatedly after displacement with water. After displacement with water,the average porosity and permeability of the reservoir above 500.0 mD increased while the permeability below 500.0 mD decreased;the maximum pore throat radius and the average coordination number of pore throat increased,but the average radius of pore throat and mercury saturation median radius had different levels of reduction;the average diameter of pore and pore throats enlarged in the medium-coarse sandstone(median size above 1.5 μm),but reduced in the fine-grained sandstone(median size below 1.5 μm);the microscopic homogeneous coefficient of reservoir decreased while variation coefficient increases,and the micro-heterogeneity of reservoir became stronger;the resident oil mainly distributed on the surfaces of grains,in the corners of intergranular pores,micropores and pore throats that cannot be swept by water.