气孔状火山碎屑岩储集层成因特征及油气勘探意义

在克拉玛依油田夏72井区风城组发现了一套罕见的气孔状火山碎屑岩储集岩，通过大铸体薄片显微镜下微观分析，对该类储集岩的组分特征、结构构造、孔隙类型进行了系统研究，对其成因机理及油气勘探意义进行了探讨，认为该套储集岩为喷出的炙热火山灰流，受到地表汽化水蒸气的影响，沉积时发生不均匀重熔作用形成的气孔状重熔流纹质弱熔结含火山砾玻屑凝灰岩；岩体的下部收缩裂缝及溶孔发育，渗流作用较好，为良好的储集、渗流层，中上部气孔及基质微孔发育，为良好的储集层，具有较大的勘探潜力。

Genetic Characteristics of Vesicular Volcanic Clastic Reservoir of Fengcheng Formation in Wellblock Xia-72 and Its Significance for Hydrocarbon Exploration

The vesicular volcanic clasitic reservoir of Fengcheng formation in Wellblock Xia-72 is a rare reservoir rock with great potential for hydrocarbon exploration. Microscopic analysis has been conducted with microscope by using large cast thin section manufacturing technology to make a systematic research on the component feature, textural structure and porous type and to examine the genetic mechanism and exploration significance. This paper suggests that the extremely hot erupted ash flow of such types of reservoirs is influenced by vaporized water steam on the surface, and asymmetric diatexis process take place during deposition, forming vesicular diatexis rhyolitic and vitric tuff with volcanic gravels. The lower part of rock mass is good reservoir and percolation rock characterized by developed constricted fissures and dissolved pores; the mid-upper part is good reservoir rock with developed vesicular and matrix micropore textures. Such a volcanic elastic reservoir is believed to be of great potential for petroleum exploration.