准噶尔盆地东部石炭系火山岩储层地质特征及油气意义

准噶尔盆地东部石炭系火山岩油气藏勘探近年来取得了重大成就。该区石炭系巴塔玛依内山组火山岩储层类型多样,包括玄武岩、安山岩和流纹岩等火山熔岩,火山集块、火山角砾岩、凝灰岩等火山碎屑岩以及各种沉积—火山岩。火山岩存在多期次、间歇性喷发的特征,一般至少可以划分为3个喷发期次,沉积岩夹层是其主要喷发间断面,两个沉积夹层之间的火山岩层段是有利储集段带。该区石炭纪古火山机构类型多样,近火山通道火山角砾岩发育,是有利的储集相带。综合古生物化石证据和同位素年代学资料,火山活动时限为早石炭世,该区石炭系地层自下而上应为下石炭统塔木岗组、滴水泉组和巴塔玛依内山组;上石炭统为石钱滩组。

The geological characteristics and oil-gas significance of the Carboniferous volcanic reservoir in eastern Junggar Basin

Exploration on oil-gas reservoir of the Carboniferous volcanic rocks made great successes in recent years. In this area,the types of volcanic reservoir of Batamayineishan Formation are diverse,including lavas,such as basalt,andesite,rhyolitea et al.,pyroclastics,as volcanic agglomerate,breccias tuff and different sedimentary-volcanic rocks.The volcanic rocks characterize multiple stages and intermittent eruption.The complete cross section of Batamayineishan Formiaton are grouped at least three stages,with sedimentary interbeds as discontinuity surface.The volcanic rocks are favorable reservoirs between two interbeds.The types of ancient volcanic edifices are various.The regions nearby volcanic conduit,riched in pyroclastics,are advantage zones for reservoirs.Combined data of isotopic chronology and fossil evidence,it is certain that the time of volcano eruption is early Carboniferous.The stratas of Cauboniferous in the study area from below is Tamugang,Dishuiquan and Batamayineishan Formation of lower Carboniferous and Shiqiantan Formation of upper Carboniferous.