东胜气田锦58井区盒1段储层特征及分类评价

Reservoir Characteristics and Classification Evaluation of Shihezi 1 Member,Jing 58 Wellblock, Dongsheng Gasfield

依据粒度分析、岩石薄片、铸体薄片、毛细管压力曲线等分析化验资料,结合东胜气田锦58井区盒1段沉积特征,对盒1段砂岩储层特征开展研究及分类评价。结果表明:盒1段储层砂岩岩性以粗、中粒岩屑砂岩和岩屑石英砂岩为主,属于低孔—特低孔、特低渗—超低渗型储层;储层孔隙以粒间溶孔和原生粒间孔为主,其次是粒内溶孔;储层以细孔隙、中小孔喉为主。根据沉积微相、岩性、物性、孔隙类型及毛细管压力曲线将砂岩储层分为3类,其中Ⅰ类和Ⅱ类为好、较好储层。

On the basis of thin-section and casting thin-section identification, and grain-size and capillary-pressure curve analysis, combined with depositional features, we implemented series studies on the sandstone reservoirs of Shihezi1 Member, Jing 58 wellblock, Dongsheng gasfield, including characteristics, and classification and evaluation. Results show that(1) Shihezi 1 Member is mainly composed of coarse-to medium-sized lithic sandstone and lithic quartz sandstone, and belongs to low-to extra low-porosity and extra low-to ultra low-permeability reservoirs;(2) pore types are primarily intergranular dissolution pore and primary intergranular pore, followed by intragranular dissolution pore; and(3) reservoir space is mainly fine pore, and middle to small pore and throat.In addition, these sandstone reservoirs can be subdivided into three types according to sedimentary microfacies, lithology, petrophysical property, pore type, and capillary-pressure curve, in which type I and type II fall into the best and better ones.