松辽盆地徐家围子断陷营城组火山岩储集空间演化

松辽盆地徐家围子断陷在营城组火山岩中获得商业气流,但各井的产量存在较大差异,这不仅与火山岩的分布有关,而且还与火山岩储层储集空间的发育程度有关。通过岩心、薄片、扫描电镜等资料的分析研究,该区主要的储集岩石类型为各类火山熔岩和火山角砾岩,储集空间有原生和次生两类,虽然原生储集空间所占比例较小,但它为后期的改造提供有利条件。火山岩储集空间的发育演化划分出4个阶段:第一阶段为原生储集空间形成阶段,第二阶段为风化淋滤阶段,这两个阶段以建设作用为主;第三阶段为浅埋藏及构造裂隙发育阶段,建设和破坏作用共存,但以建设作用为主; 第四阶段为深埋藏阶段,以破坏作用为主。

RESERVOIR SPACE EVOLUTION OF VOLCANIC ROCKS IN THE YINGCHENG FORMATION OF THE XUJIAWEIZI FAULT DEPRESSION, THE SONGLIAO BASIN

Commercial gas streams were obtained from volcanic rocks in the Yingcheng Formation of the Xujiaweizi Fault Depression, the Songliao Basin, but the output of each well was different. It was not only related to the distribution of volcanic rocks, but also related to the developing degree of accumulating spaces in volcanic rock reservoirs. The study of core, thin section and scanning electron microscope data showed that the main accumulating rock types of the study area were various volcanic lava and volcanic breccia, and the accumulating spaces included primary and secondary two kines. Though the primary accumulating spaces took the small proportion, they provided fovorable conditions for paulopost reconstruction. The development and evolution of volcanic rock accumulating spaces can be divided into four stages. The first is the forming stage of primary accumulationg spaces, and the secondary is weathering and leaching stage. These two stages are dominated by construction. The third is shallow-burying and structural fracture developing stage, with coexisting of construction and destruction, but dominated by construction. The fourth is deep-burying stage, which is dominated by destruction.