松辽盆地中南缘火山喷发作用及其岩石特征

本文研究了出露于松辽盆地中南部边缘的火山岩地层，结合盆地内钻井资料确定了盆地边缘火山岩岩性、岩相和火山岩组合特征，并分析其空间分布规律和喷发作用。研究表明: 松辽盆地中南缘主要发育酸性火山岩，少量基性玄武岩和安山玄武岩、玄武安山岩; 火山岩相的喷发方式主要以爆发相、喷溢相、侵出相为主; 火山岩发育的储集空间类型主要有原生孔隙、次生孔隙和裂缝; 喷溢相上部亚相、中部亚相、爆发相热碎屑流亚相和火山通道相可以成为较好的油气储层。

Volcanic eruption and its rock characteristics in central-sourthern Songliao Basin

The author studied the volcanic strata exposed in the central-southern Songliao Basin,including the lithological,lithofacies and assemblage characteristics of volcanic rocks,and analyzed the spatial distribution and eruption,combined with drilling data.The results showed that in the central-sourthern Songliao Basin mainly developed acid volcanic rocks with a few basic basalt,andesitic basalt and basaltic andesite.Eruption patterns were mainly in burst facies,effusive facies and extrusion facies.The types of reservoir space developed in volcanic rocks were primary pores,secondary pores and fractures.The upper and middle subfacies of effusive facies,hot detritus flow subfacies of burst facies and volcanic conduic facies were better for finding the petroleum reservoirs.