准噶尔盆地彩南油田彩003井区侏罗系辫状河三角洲相储层特征研究

为对我国西部盆地中广泛发育的辫状河三角洲储层特征进行研究，以准噶尔盆地彩南油田侏罗系辫状河三角洲相储层为研究对象，对储层矿物特征、孔隙结构特征以及储层物性进行了详细分析。通过岩石碎屑组分、粘土矿物、颗粒磨圆度、分选等方面研究对研究区储层矿物特征进行分析，发现研究区储层岩性主要为长石岩屑砂岩和岩屑砂岩为主，碎屑组分中不稳定组分（长石＋岩屑）含量高，成分成熟度低；利用孔隙半径平均值、平均孔喉比、孔隙配位数、孔隙均质系数、平均喉道宽度、排替压力等6个参数指标对孔隙特征进行分析，结果显示辫状河三角洲相储层孔喉特征中等；储层物性分析结果显示辫状河三角洲相储层的孔渗变化较大，整体上为中等孔渗储层，可以作为一种较好的油气储集层。

Jurassic Reservoir Characteristics of Braided-Delta in Cainan Oilfield,Junggar Basin

For the purpose of studying the characteristics of braided deltaic reservoirs that are widely developed in the western basins of China, we take the braided deltaic reservoir in Cainan oilfield, Junggar Basin as an example to analyze the mineral character, pore structure, and physical property of reservoir in this area. After researching the detrital component, clay mineral, grain psephicity, and grain selection, we analyze the mineral character of this reservoir, and find that the main lithologies are lithic sandstone and feldspar lithic sandstone. The unstable components (feldspar and debris) in the detrital components are high, and compositional maturity is low. We also utilize the average value of pore radius, average pore throat ratio, pore coordination number, pore uniformity coefficient, average throats width and replacement pressure to study the pore character, and the result shows that the pore character of the braided deltaic reservoir is moderate. In the analysis of the physical property, we find the porosity and permeability are changed greatly, and the reservoir of this kind is characterized by moderate porosity and permeability. In summary, the braided delta reservoir is a kind of moderate reservoir, and it is able to form good hydrocarbon reservoir.