二连盆地洪浩尔舒特凹陷中生界火山岩特征及储层控制因素分析

为了明确二连盆地洪浩尔舒特凹陷中生界火山岩的分布规律,本文通过对火山岩的岩心观察、薄片鉴定、测井资料、地震资料的综合分析,提出洪浩尔舒特凹陷中生界火山岩主要发育于阿尔善组下段、阿尔善组上段和腾格尔组一段,以安山岩、凝灰岩和火山角砾岩为主;发育爆发相、喷溢相和喷发沉积相,以喷溢相发育程度高、喷发沉积相分布广为特点;洪浩尔舒特凹陷中生代火山岩主要沿断裂分布,在垂向上表现为多期次喷发序列的叠置,共经历了3个火山喷发旋回、14个火山喷发期次。储层孔隙类型多样,以气孔和构造缝最发育。储层储集性受到火山岩岩性岩相类型、成岩后期的构造活动和成岩作用等因素的制约,以岩相因素影响最明显。

The Reservoir Research and Analysis on the Control Factors of the Reservoir Capabilities of Mesozoic Volcanic in Honghaoershute Sag of Erlian Basin

According to core observation, thin section identification and integration of well log and seismic data of Honghaoershute Sag, the Aershan formation lower segment, Aershan formation upper segment and Tenggeer formation first segment are rich in volcanic rocks, mainly consisting of andesite, volcanic breccia and tuff. Explosive facies, effusive facies and eruptive sedimentary facies can be identified, which are mainly effusive facies. The Mesozoic volcanic rocks in Honghaoershute Sag are distributed along big faults and superimposed by many times of volcanic eruption in the vertical. Three cycles and fourteen periods of volcanic eruption can be identified. The reservoir space consisted mainly of stomata and fracture. The major controlling parameters for reservoir quality are petrology, lithofacies and tectonic action as well as diagenesis.