三塘湖盆地石炭系火山岩喷发环境及储层特征研究

The Eruption Environment and Reservoir Characteristics of Carboniferous Volcanic Rocks in Sangtanghu Basin

陆上与水下喷发火山岩在岩性、结构构造、蚀变特征、产状、与下伏地层接触关系、孔隙和裂缝发育特点等方面有显著区别。三塘湖盆地石炭系发育卡拉岗组(C2k)和哈尔加乌组(C2h)共2套储层,通过对这两个组的火山岩地球化学特征、岩性特征、蚀变特征、岩相类型、结构构造等进行研究,认为C2k以陆上喷发为主,而C2h为水陆过渡的环境,但以水下喷发为主。结合其储集空间的发育情况,综合分析认为陆上喷发环境储集性能优于水下喷发环境。

The subaerial and subaqueous volcanic rock eruption was significant different in lithology,texture and structure,erosive property,occurence,contact with underlying strata,pore and fissure development etc.Two sets of volcanic reservoirs in Kalagang Formation and Ha'erjiawu Formation were developed during Carboniferous System in Santanghu Basin.By studying the characters of volcanic geochemistry,lithology,erosion,lithofacies types and structure etc,it is considered that the environment of the volcanic rocks of Kalagang Formation is subaerial eruption.It is water-land transition eruption,but main environment is subaqueous.In consideration of its reservoir space development,the integral analysis shows that the properties of volcano rock reservoir which is erupted in subaerial is better than that of subaqueous.