长岭断陷查干花次凹火石岭组火山岩喷发模式新认识  

New Insights into Eruption Model of Huoshiling Formation Volcanic Rocks in Chaganhua Subsag of Changling Fault Depression

作　　者：许方哲 朱建峰[1] 刘玉虎[1] 冷庆磊 XU Fangzhe;ZHU Jianfeng;LIU Yuhu;LENG Qinglei(Research Institute of Exploration and Development,Northeast Oil&Gas Company,Sinopec,Changchun,Jilin 130062,China)

机构地区：[1]中国石化东北油气分公司勘探开发研究院,长春130062

出　　处：《新疆石油地质》2024年第5期533-540,共8页Xinjiang Petroleum Geology

基　　金：中国石油化工股份有限公司科技项目(P21104)。

摘　　要：长岭断陷查干花次凹火石岭组火山岩岩石类型及岩性组合与典型火山碎屑岩存在差异,其岩心、薄片见火山灰球、淬碎角砾等特殊构造,储集层物性较差,无典型的火山岩丘状包络机构,火山岩可能形成于特殊的喷发环境。根据地震波反射特征、岩心描述、薄片特征及分析化验资料,识别不同喷发环境的典型标志,结合已钻井岩性组合、区域构造背景等,建立该区的火山喷发堆积模式。研究表明:该区火山岩经历了3个喷发期次,分别处于陆上、水陆交替和水下喷发环境。水下喷发火山岩纵横比小,常呈宽缓盾状,原生孔隙不发育,溶蚀孔、脱玻化孔等发育,储集空间整体以中—小孔隙为主。陆上喷发火山岩孔隙较发育,物性较好,为油气勘探开发的主要目标。The exploration and development practice has suggested that the volcanic rocks of the Huoshiling formation in the Chaganhua subsag of the Changling fault depression are distinct in rock types and lithologic assemblages from typical volcanoclastic rocks.Core samples and thin sections from the Huoshiling formation volcanic rocks reveal unique structures such as volcanic ash balls and quenchfractured breccia,with generally poor reservoir physical properties.Typical hummocky envelopes of volcanic edifice cannot be identified.All these phenomena indicate a potential unique eruption environment in this area.By analyzing seismic reflection characteristics,core descriptions,thin section features,and laboratory test results,typical indicators of the eruption environments were identified.Combining lithologic assemblages from existing wells and the regional tectonic setting,a volcanic eruption and deposition model for this area was established.The study reveals that the volcanic rocks in this area experienced three periods of eruption in onshore,land-water and underwater environments,respectively.Underwater volcanic rocks exhibit low aspect ratio,and is often in wide and gentle shield shape,with poorly developed primary pores,but developed dissolution and devitrification pores.The overall reservoir space is dominated by medium to small pores.The onshore volcanic rock strata are selected as exploration targets due to developed pores and good rock physical properties.

关 键 词：长岭断陷 查干花次凹 火石岭组 火山岩储集层 岩性组合 喷发环境 识别标志 储集空间 

分 类 号：P618.13[天文地球—矿床学]