车排子地区火山岩储集空间发育特征及有利区带预测  

Reservoir space characteristics and favorable area prediction of volcanic rocks in Chepaizi area,Junggar Basin

作　　者：苗春欣 傅爱兵[1] 关丽[1] 余光华[1] 李燕[1] 商丰凯[1] 倪自高[1] 王继红[1] 

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257015

出　　处：《油气地质与采收率》2015年第6期27-31,共5页Petroleum Geology and Recovery Efficiency

基　　金：中国石化重大导向项目"准噶尔盆地重点区带评价与突破目标"

摘　　要：为研究车排子地区火山岩储层发育特征,利用显微镜及CT扫描方法观测不同岩性火山岩的储集空间发育特征,结合地质条件探讨次生作用对火山岩孔隙演化的影响,以岩心、测井及荧光薄片等资料分析储层含油性与储层类型的关系。研究结果表明,研究区火山岩原生孔隙及裂缝的发育受岩相—岩性控制,并影响其次生作用程度。对于安山质角砾岩和安山岩,普遍发育的气孔、收缩缝和火山玻璃为后期应力作用下的裂缝扩张及地表和地下水的渗入、溶蚀、沉淀提供了有利条件;对于凝灰岩,由于较强的水解溶蚀作用,颗粒严重蚀变,机械压实作用较强,原生储集空间多被充填,储集性能较差。研究区火山岩储层的含油性主要与裂缝的发育程度有关,只有位于有效裂缝附近的基质孔隙才可能含油。根据测井资料计算车排子地区火山岩的基质孔隙度、裂缝孔隙度及裂缝孔隙度分布指数,并据此预测有利区带主要分布于研究区南部排674井附近、东部排66井附近以及西北部排682井附近。For the purpose of accurately forecasting development of favorable volcanic reservoirs in Chepaizi area,Junggar Basin,the pores/fractures characteristics of different lithologies of volcanic rock were observed with microscope and Computer Tomography(CT). And then effects of secondary action on volcanic rock evolution were discussed combining with geological conditions. Moreover,the relationship between oil- bearing and reservoir characteristics of volcanic reservoir were ascertained with core analysis,log data interpretation and fluorescence slice observation. The results show that in the study area,the lithologies and lithofacies of volcanic rock control the development of primary pores/fractures of volcanic rocks,and they also affect the formation and development of secondary pore/fractures. Vesicles,contraction fractures,volcanic glasses are commonly found in rocks of andesite and andesitic breccias,which can provide initial reservoir spaces for the extension of fracture under tectonic stresses and for the infiltration,dissolution and precipitation of surface and underground water. As for the tuff,its particles were altered seriously due to the hydrolysis-dissolution of unstable minerals and the majorities of primary pores were refilled due to strong mechanical compaction underground,so the volume of reservoir space was reduced dramatically and its property became poor. Almost all of the oil-bearing volcanic rocks in the study area are relative to factures,and the oil-filling pores are only found near fractures. According to this,the pore porosity,the fracture porosity,and the fracture factors of volcanic rocks were calculated using log data,therefore the favorite reservoir areas of volcanic rocks in the study area were forecasted,which include the south area near Well Pai 674,the east area near WellPai 66,and the northwest area near Well Pai 682.

关 键 词：火山岩 原生孔隙 裂缝 孔隙度 车排子凸起 准噶尔盆地 

分 类 号：TE112.222[石油与天然气工程—油气勘探]