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首页> 外文期刊>Journal of Petroleum Exploration and Production Technology >Reservoir characterization and origin of tight gas sandstones in the Upper Triassic Xujiahe formation, Western Sichuan Basin, China
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Reservoir characterization and origin of tight gas sandstones in the Upper Triassic Xujiahe formation, Western Sichuan Basin, China

机译：四川盆地上三叠统须家河组致密气砂岩储层特征与成因

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摘要

The Western Sichuan Basin, which is located at the front of Longmen Mountain in the western Sichuan Province, China, is a foreland basin formed in the Late Triassic. The Upper Triassic Xujiahe formation in the Basin includes several tight gas sandstone reservoirs, whose porosity is less than 6.0?% and permeability less than 0.1 md. According to data of cores, thin sections, FMI, SEM and experiments, we summarize the reservoir characteristics, analyze the origin of these tight gas sandstones, and discuss the factors controlling the formation of relatively high-quality reservoirs. Xujiahe Formation is a set of terrestrial clastic rocks with low compositional maturity, low cement content, and medium textural maturity. Secondary dissolution pores are abundant, but pore spaces are small with narrow pore throats and high capillary pressures. Due to the existence of abundant fractures and intense diagenesis, these tight gas reservoirs are characterized by high reservoir heterogeneity, complex seepage system, and strong stress sensitivity. The original sedimentary facies belt and later tectonism co-control the distribution of favorable reservoirs. The intense compaction and cementation are the main factors making the Xujiahe formation to be tight.
机译：四川盆地位于中国西部四川省龙门山前，是三叠纪晚期形成的前陆盆地。盆地上三叠统须家河组包括几个致密气砂岩储层，其孔隙度小于6.0％，渗透率小于0.1md。根据岩心，薄片，FMI，SEM和实验数据，总结了储层特征，分析了致密气砂岩的成因，探讨了控制相对优质储层形成的因素。徐家河组是一组地层碎屑岩，成分成熟度低，水泥含量低，质地成熟度中等。次生溶解孔丰富，但孔空间狭窄，孔喉狭窄，毛细压力高。由于存在大量裂缝和强烈的成岩作用，致密气藏具有非均质性高，渗流体系复杂，应力敏感性强的特点。原始的沉积相带和后来的构造共同控制着有利储层的分布。强烈的压实和胶结作用是使须家河组致密的主要因素。

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