盘古梁地区长6_1油层储层特征及有利区预测

Reservior Charactristics and Prediction on Favorable Areas of Chang 6_1 Reservoir in Panguliang Region

鄂尔多斯盆地盘古梁地区长61油层具有较大的勘探开发潜力。通过岩心观察、薄片研究、粒度分析,对靖安油田长61储层特征进行了深入研究和分析。结果表明:长61油层的主要岩石类型为长石砂岩和岩屑质长石砂岩,磨圆度以次圆-次棱角状为主,砂岩分选中等-较好;长61油层沉积时期主要发育三角洲前缘亚相,主要的砂体类型有水下分流河道、河口砂坝,且长621小层的水下分流河道砂体最为发育;储层物性主要为低孔低渗型且孔隙度和渗透率具有较好的相关性。此外,在储层特征研究的基础上,将该区储层划分为3类,并对有利区进行了预测,这也是进一步勘探开发的首选地区。

There existed enormous exploration and development potential forces in Chang 61 Reservoirs in Panguliang Region of Ordos Basin.Chang 61 Reservoir Characteristics in Jing'an Oilfield were deeply studied by using data of core observation,cast slices,scanning electron microscope and grain size analysis.The result shows that the main reservoir rock types are lithic arkose and arcose in the study area,whose psephicities are subrounded and subangular.Sand sorting is moderate to better level.In Chang 61 sedimentary period,the studied area mainly developed subaqueous distributary channels and channel mouth bars,and subaqueous distributary channel sand body was especially well developed in 612reservoir.It is found that the reservoir physical property is dominated with low porosity and low permeability,it is an optimal area for nest oil exploration.