榆林气田储层成岩作用与烃类充注期次研究

Study on diagenesis and hydrocarbon filling stages in Yulin gas field

通过薄片鉴定、X衍射分析、扫描电镜分析等手段,对榆林气田二叠系山西组山2段砂岩储层成岩作用进行了研究。研究表明,压实作用和胶结作用是榆林气田储层物性较差的主要原因。根据包裹体测试结果,结合埋藏史综合分析认为,榆林气田烃类充注主要有4个时期,分别为中三叠世晚期—晚三叠世晚期、晚三叠世晚期—早侏罗世晚期、早侏罗世晚期—晚侏罗世晚期和晚侏罗世晚期—早白垩世晚期。

This paper studies the diagenesis of the sandstone reservoirs in the Shan 2 member of Permian Shanxi formation in Yulin gas field through analysis of thin section, X-ray diffraction and scanning electron microscope inspection. The study indicates that Yulin gas field ascribes poor reservoir properties mainly to compaction and cementation. The results of fluid inclusion testing and burial history analysis have shown that there were 4 stages of hydrocarbon filling in Yulin gas field, which were late Middle Triassic-late Late Triassic, late Late Triassic-late Early Jurassic, late Early Jurassic-late Late Jurassic, and late Late Jurassic-late Early Cretaceous.