鄂尔多斯盆地蟠龙油田216井区储层特征评价

文章综合利用岩心分析、铸体薄片、电镜扫描和压汞法等手段,对鄂尔多斯盆地蟠龙油田216井区延长组长2和长6段储层岩石特征、孔隙结构、面孔率等进行了分析,评价了长2和长6段储层物性特征。研究结果表明:1)长2段与长6段的砂岩岩性主要为长石砂岩,很少见到长石岩屑砂岩与岩屑砂岩。2)在长2段中的填隙物主要是自生矿物,而长6段中主要填隙物是胶结物,储集空间类型主要是粒间孔和溶孔。3)长2的储集体属于中等孔喉分选,孔喉的连通性相对较差;长6的孔隙结构相差较大,大多为中小孔以及微细-细喉道,物性较差,属于低孔低渗至特低孔特低渗储层。4)控制储层物性的主要因素为沉积环境和成岩作用。

Reservoir characteristics evaluation of area 216 well in Panlong oilfield, Ordos Basin

Core analysis, casting thin sections, scanning electron microscopy and mercury injection are comprehensively used to analyze the rock characteristics, pore structure and ratio of surface and porosity of reservoirs of Member Chang 2 and Chang 6 in Yanchang Formation of Panlong Oilfield, Ordos Basin for evaluation of their physical properties. The results show that the sandstone lithology of Member Chang 2 and Chang 6 is mainly feldspar sandstone, feldspar detrital sandstone and detrital sandstone seldom; the fillings in Chang 2 are mainly authigenic minerals, and the fillings in Chang 6 cements; the reservoir space mainly intergranular pore and dissolved pore; the reservoir of Chang 2 belongs to medium pore throat separation with relatively poor connectivity; pore structurres of reservoirs in Member Chang 6 are quite different of which most are small and medium-sized pore and micro-fine throat with poor physical properties belonging to low-porosity and low-permeability to ultra-low-porosity and ultra-low-permeability reservoirs; The main physical property controlling factors of the reservoir are sedimentary environment and diagenesis.