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首页> 美国卫生研究院文献>PLoS Clinical Trials >Characteristics and origin of the relatively high-quality tight reservoir in the Silurian Xiaoheba Formation in the southeastern Sichuan Basin
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Characteristics and origin of the relatively high-quality tight reservoir in the Silurian Xiaoheba Formation in the southeastern Sichuan Basin

机译：四川盆地东南部志留系小河坝组致密致密油藏特征与成因

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A mature understanding of the sandstone gas reservoir in the Xiaoheba Formation in the southeastern Sichuan Basin remains lacking. To assess the reservoir characteristics and the origin of the high-quality reservoir in the Xiaoheba Formation, this paper uses systematic field investigations, physical property analysis, thin section identification, scanning electron microscopy and electron microprobe methods. The results indicate that the Xiaoheba sandstone is an ultra-tight and ultra-low permeability reservoir, with an average porosity of 2.97% and an average permeability of 0.56×10−3 μm2. This promising reservoir is mainly distributed in the Lengshuixi and Shuangliuba regions and the latter has a relatively high-quality reservoir with an average porosity of 5.28% and average permeability of 0.53×10−3 μm2. The reservoir space comprises secondary intergranular dissolved pores, moldic pores and fractures. Microfacies, feldspar dissolution and fracture connectivity control the quality of this reservoir. The relatively weak compaction and cementation in the interbedded delta front distal bar and interdistributary bay microfacies indirectly protected the primary intergranular pores and enhanced late-stage dissolution. Late-stage potassium feldspar dissolution was controlled by the early-stage organic acid dissolution intensity and the distance from the hydrocarbon generation center. Early-stage fractures acted as pathways for organic acid migration and were therefore important factors in the formation of the reservoir. Based on these observations, the area to the west of the Shuangliuba and Lengshuixi regions has potential for gas exploration.
机译：四川盆地东南部小河坝组砂岩气藏尚缺乏成熟的认识。为了评估小河坝组优质储层特征和成因，本文采用系统的野外调查，物性分析，薄片识别，扫描电子显微镜和电子探针方法。结果表明，小河坝砂岩为超致密超低渗透储层，平均孔隙度为2.97％，平均渗透率为0.56×10 -3 μm 2 。该有前途的储层主要分布在冷水溪和双流坝地区，后者的储层质量较高，平均孔隙度为5.28％，平均渗透率为0.53×10 −3 μm 2 。储层空间包括次生的粒间溶解孔，霉菌孔和裂缝。微相，长石溶解和裂缝连通性控制了该储层的质量。交错的三角洲前部远侧钢筋和分布间的海湾微相中相对较弱的压实和胶结作用间接地保护了主要的粒间孔并增强了后期溶出作用。后期长石钾的溶解受早期有机酸的溶解强度和与烃生成中心的距离控制。早期裂缝是有机酸运移的途径，因此是形成储层的重要因素。基于这些观察，双流坝和冷水溪地区以西的地区具有天然气勘探的潜力。

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