低渗储层特征及主控因素研究——以A油田X油层组为例

Low Permeability Reservoir Characteristics and Main Control Factors of X Oil-bearing Strata Group in A Oilfield

利用岩心描述、铸体薄片、图像粒度、扫描电镜、阴极发光以及毛管压力分析等资料,对A油田X油层组低渗储层质量及其控制因素进行了研究。结果表明:岩石以细粒-岩屑质长石砂岩为主,分选好,具有石英含量低,长石含量高,岩屑含量较高以及成分成熟度低的特点。低渗储层主要控制因素是沉积作用和成岩作用,构造作用对储层影响较小。通过对目的层砂岩储层特征分析,探讨低渗储层的主要控制因素,为低渗砂岩储集层背景下的有利储层预测提供更可靠的地质依据。

The quality of low permeability reservoir and its main control factors of X Oil-bearing Strata Group in A Oilfield were studied by using the data of core description,casting thin slice,imaging particle size,scanning electro microscope,cathodeluminescence and capillary pressure analysis.The results show that the rock type is mainly of granulefragments arkose sandstone with the characteristics of good sorting,low quartz,high arkose and rock fragments and low maturaty of components.By further characterization of physical property and pore texture,it is discovered that the key controlling factors are sedimentation and diagenesis that affect the low permeability reservoir quality and the influences of structure is limited on reservoir quality.At the same time the control factors of low-permeability reservoir are researched by analyzing sand reservoir quality of the target zones,it provides reliable geological basis of favorable reservoir prediction in the low permeability reservoirs.