鄂尔多斯盆地东部地区盒 8 段致密砂岩气低产原因分析

鄂尔多斯盆地东部地区上古生界盒 8 段为低孔、低渗致密砂岩储层，单井产量低，制约了该区规模 储量的提交和气田的大规模有效开发，因此，有必要深入研究该区致密砂岩储层特征，并分析单井低产原 因。 运用铸体薄片、物性分析、高压压汞、恒速压汞、气水相渗、核磁共振与应力敏感性实验等技术手段，深 入研究了该区盒 8 段致密砂岩储层特征和单井低产的原因，并与已开发的苏里格气田进行了对比。 结果 表明：研究区盒 8 段储层具有物性差、刚性组分含量低、塑性组分含量高、喉道半径小和可动流体饱和度 低等特点；地层条件下盒 8 段储层应力敏感性强、水锁伤害大、气相渗流能力弱和水锁损害率高均是造成 单井产量低的原因。

Reasons of low yield of tight sandstone gas of He 8 member in eastern Ordos Basin

The reservoir of Neopaleozoic He 8 member in eastern Ordos Basin is characterized by low porosity, low permeability and low single well production, which restricts the large-scale development and submit scale of reserves, so it is necessary to study the characteristics of tight sandstone reservoir in this area and analyze the reason for the low yield of single well. By using cast thin sections, petrophysical analysis, high-pressure mercury injection, constant-speed mercury injection, gas water relative permeability, nuclear magnetic resonance and stress sensitivity experiment technology, this paper studied the characteristics of tight sandstone reservoir and the reasons of low yield of He 8 member in eastern Ordos Basin, and compared with Sulige Gas Field. The results show that the reservoir of He 8 member in the study area has poor properties, low content of rigid component, high content of plastic component, small pore throat radius and low movable fluid saturation. Strong stress sensitivity, great water lock damage and low gas permeability are the geological causes for the low yield of single well in the formation conditions.