泥质分布形式对泥质砂岩电性的影响规律研究

介绍了将混合理论用于结构泥质、将基于距离的升尺度(DBU)方法用于层状泥质电性研究的原理和方法,通过对实际岩心资料以及井资料的分析处理,证实了将混合理论用于结构泥质、将DBU方法用于层状泥质砂岩电性研究的合理性,最后利用上述方法进一步分析了泥质含量、泥质的分布形式等对泥质砂岩电阻率的影响及规律,研究结果表明:随着泥质含量的增加,泥质砂岩电阻率逐渐降低,且降低的幅度随含水饱和度的降低而增大;当测量电流方向与层状泥质垂直时,泥质对电性的影响较弱,但层状泥质和结构泥质的相对含量对结果的影响很大;当测量电流方向与层状泥质平行时,泥质对电性的影响较强,但层状泥质和结构泥质的相对含量对结果的影响不大.

Study on the effect of shale distribution forms on shaly sandstone electrical properties

Firstly, the mixture theory that is used to the study of the structural shale effect and distance-based upscaling (DBU) that is used to the study of the laminated shale effect are introduced. Then through the analysis of rock experiment results and well data, the rationality that the mixture theory is used to study the structural shale effect and the DBU method is used to the study of the laminated shale effect is validated. At last, the effects of shale content and shale distribution forms on shaly sandstone electrical properties are studied. The results indicate that with the increasing of the shale content, rock resistivity reduces and the extent of the resistivity drop increases with the reducing of the water saturation. When electrical current is vertical to laminated shale, the effect of the shale on electrical properties is little while the relative content of the laminated shale and structural shale has great effect on electrical properties; When electrical current is parallel to laminated shale, the effect of the shale on electrical properties is great while the relative content of the laminated shale and structural shale has little effect on electrical properties.