鄂尔多斯盆地华庆地区长6_3亚段储集层与成岩相研究

摘要

The debris flow channel deposits of sublacustrine fan of Chang 63 sub-member in Huaqing area,Ordos Basin are from different provenances,which could be divided into three parts,including the dominant northeast and southwest sources,and the minor mixed source.Based on the composition,diagenesis,and the differences and zones of plane diagenetic facies distribution of Chang 63 sandstone reservoir,it is determined that the provenances are the main factors that control the reservoir distribution.The chlorite cementation-intergranular pore diagenetic facies controlled by northeast provenance and the chlorite cementation-intergranular pore and feldspar dissolution diagenetic facies controlled by the western mixed source are the most favorable depositional-diagenetic facies zones.The research results can provide references for reservoir evaluation and development in Huaqing area.%鄂尔多斯盆地华庆地区上三叠统延长组长63亚段湖底扇砂质碎屑流水道沉积来自不同的物源区,可划分出北东部和南西部2个主物源沉积区和介于其间的混源沉积区。依据长63亚段砂岩储层的物质组分、成岩作用和成岩相平面分布的差异性和区带性特征,提出不同物源区是控制该地区长63亚段砂岩储层分布的主要因素,受北东部物源区控制的绿泥石膜胶结-粒间孔成岩相以及受混源区西部物源区控制的绿泥石膜胶结-粒间孔＋长石溶蚀成岩相,是最有利储层发育的沉积-成岩相。研究结果为该区储层预测、评价和高效开发提供了依据。