松辽盆地德惠断陷营城组火山岩储层孔隙特征

Characteristics of pore of volcanic rocks reservoir in Yingcheng Formation in Dehui fault depression of Songliao Basin

德惠断陷营城组地层以发育火山岩为特征,主要岩性为酸性岩和中酸性岩,少量基性岩。火山岩层为厚层状,单层最大厚度可达数百米。通过镜下薄片和岩心观察研究发现,该区火山岩储层孔隙类型多样,包括原生孔隙、次生孔隙和裂缝,其中后两者是油气的主要储集空间和渗流通道。研究表明,德惠断陷营城组火山岩储集空间的形成演化过程复杂,构造运动、风化淋滤作用及流体活动是影响储集空间发育的主要控制因素。

Yingcheng Formation of Dehui fault depression characterized by the development of volcanic rocks,mainly acid and intermediate acidity rock and also basic rocks.Volcanic rocks are heavy bedded and single-layer maximum thickness is up to several hundred meters.By microscopic observation of thin sections and the reseach of core showed that the type of pore in volcanic rock of is diverse,include original pore,secondary pore and fractures,of which the latter two are the main hydrocarbon pore volume and seepage channel of reservoirs.Research shows that the formation of reservoir space and evolution process is very complex,which tectonization,dissolution and hydrothermal fluid flow are the main factors to control volcanic reservoir development.