摘要
浅层远源次生气藏是川西南部地区一个重要的勘探开发对象。经过多年的勘探获得了多个次生气藏,展示了良好的勘探开发效果。为了拓宽次生气藏的勘探领域,利用野外剖面及邻区钻录井资料,对白垩系天马山组、夹关组的储层岩石学特征、储集空间类型、成岩作用类型等进行了分析。结果表明,天马山组储层砂岩以细粒为主,孔隙欠发育,仅局部见粒间溶孔,成岩作用强,储集性能较差;夹关组储层砂岩以中粒为主,孔隙较发育,储集空间主要为粒内溶孔,孔隙结构及连通性好,为裂缝孔隙型储层,邻区储层发育程度较高。综合分析认为,夹关组具有与已知次生气藏类似的地质特征,为该区次生油气勘探的新层系。
Shallow, distant- source, and secondary gas reservoirs are important exploration and development aims in southwestern Sichuan Basin. There are a few secondary gas reservoirs discovered after years of exploration. Based on field geologic profile and some drilling and mud-logging data from adjoining areas, the petrological characteristics, reservoir- space type, and diagenesis were studied for the Cretaceous Tianmashan and Jiaguan formations. Results show that(1) Tianmashan reservoir is mainly composed of fine-grained sandstone with less developed pore and partly intergranular dissolution pore found, and is characterized by strong dia-genesis and poor reservoir property. And(2) Jiaguan reservoir is dominated by medium-sized sandstone with more developed pore and mainly intragranular dissolution pore as the soul, and is featured by better porous structure and connectivity; surrounded by highly developed reservoirs, it is also a fractured-porous reservoir.In addition, it's deemed that Jiaguan Formation has similar geological characteristics with other discovered secondary gas reservoirs.As a result, it should be a new exploration layer for secondary oil and gas in this area.
出处
《天然气技术与经济》
2016年第1期19-22,81-82,共4页
Natural Gas Technology and Economy
关键词
雅安地区
白垩系
储层特征
天马山组
夹关组
Ya'an area
Cretaceous
reservoir characteristics
Tianmashan Formation
Jiaguan Formation
