辫状河相砾质砂岩储层微观特征及对产能的影响——以锦州油田为例

辫状河相砾质砂岩储层疏松、含砾、孔渗关系差、微观特征与产能关系复杂。以渤海辽东湾海域锦州油田为例,利用岩心分析化验资料、测井和DST测试资料,建立岩性定量判别标准,对砾质砂岩储层进行岩性定量识别,将其细分为常规砂岩、含砾砂岩和砂砾岩。对不同岩性储层的粒度、孔喉、泥质含量及黏土矿物等特征进行分类研究,针对各类型储层不同微观特征对产能大小的影响进行了分析,找到了粒度分选、孔喉结构以及泥质黏土矿物差异与产能大小之间的关系。

Micro-characteristics of braided river gravel sandstone reservoir and its effect on production capacity

Reservoirs from the braided fluvial sandstone is loose with gravel, the porosity-permeability relation is poor and the relationship between the microscopical characteristics and the production capacity is complicated. By taking Jinzhou oilfield in Liaodong bay of Bohai sea as example, using the core testing data, the well logging data and the DST data, the quantitative discriminant criteria were established to subdivide the lithologic reservoir into three types: conventional sandstone, gravelbearing sandstone and sandy conglomerate. And then micro-characteristics of different lithologic reservoir such as grain size sorting, porosity structure, shale content and the difference of clay minerals were studied. On this basis, the effects of different micro-characteristics on the production capacity of each type of reservoir were studied, and the relationship between grain size sorting, porosity structure, shale content, clay minerals and the production capacity were discovered.