鄂尔多斯盆地白豹地区长6砂岩储层特征及影响因素分析

根据铸体薄片、扫描电镜、物性、孔隙结构等分析资料,对白豹地区长6砂岩储层特征进行研究表明,该套储层储集空间类型以溶孔-粒间孔组合为主,储层物性较差,排驱压力和中值压力较高,喉道半径小且分选性较差,孔隙结构总体较差。储层发育程度受沉积作用和成岩作用综合影响,认为岩石类型,云母等组分含量,粒径是决定储层发育的基础,北部物源影响的砂岩物性较好。早期环边绿泥石胶结作用和后期较弱的溶蚀作用促进储层的进一步发育。硅质次生加大和碳酸盐矿物、粘土矿物的胶结作用使储层储集性能大大降低。

The influential factors and characteristics of Chang 6 sandstone reservoir in Baibao re~ion of Ordos Basin

The characteristics of Chang 6 sandstone reservoir in BaiBao region of Ordos Basin were investigated by the data analysis of casing lamella, scan electron microscope,porosity and permeability, pore texture. The pore space of reservoir mainly include the dissolved pores and intergranular pores. The Chang 6 sandstone reservoir have low permeability and porosity, high displacement and median point pressure, small pore throat radius, poorly property of sorting and pore structural. The development of reservoir was affected by deposition and diagensis. Type of rock, content of glist and particle size determine development of reservoir. Sandstone from North provenance have well porosity and permeability. Early chlorite cementation, dissolution improve the development of reservoir. The cementation of silicon and carbonate and clay minerals deteriorate the physical property of reservoir.