渤海湾盆地渤中凹陷BZ8⁃3S大型构造规模型火山岩储层形成条件  

Enhanced Formation Conditions of the Large⁃Scale Volcanic Reservoir in the BZ8⁃3S Large Volcanic Structure in Bozhong Sag,Bohai Bay Basin

作　　者：周家雄 徐春强 黄志 单玄龙[2] 张江涛 衣健[2] Zhou Jiaxiong;Xu Chunqiang;Huang Zhi;Shan Xuanlong;Zhang Jiangtao;Yi Jian(Tianjin Branch of China National Offshore Oil Company Ltd.,Tianjin 300452,China;College of Earth Sciences,Jilin University,Changchun 130061,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300452 [2]吉林大学地球科学学院,吉林长春130061

出　　处：《地球科学》2025年第2期388-404,共17页Earth Science

基　　金：国家“十三五”科技重大专项(No.2016ZX05024003).

摘　　要：为解决如何在渤海湾盆地渤中凹陷中生界寻找规模型火山岩油气藏的难题,以BZ8-3S大型火山圈闭及该构造钻探的BZ8-3S-A高产火山岩探井为研究对象,详细研究了该构造火山岩岩性、岩相和储层特征,探讨了近烃源岩大型火山圈闭规模型火山岩储层的发育条件,并建立了储层发育模式.研究表明,BZ8-3S构造由多个大中型酸性熔岩火山机构叠置构成,主要发育大套喷溢相上部亚相气孔流纹岩、下部亚相块状流纹岩、火山通道相隐爆角砾岩亚相流纹质隐爆角砾岩3种岩性岩相,形成高孔−低渗、中孔−低渗和低孔−低渗3种类型火山岩储层.多喷发中心、富喷溢相上部亚相和火山通道相隐爆角砾岩亚相的大中型酸性熔岩火山机构是形成规模型火山岩储层的基础;风化作用促进了喷溢相上部亚相和隐爆角砾岩亚相溶蚀孔−缝的形成,改善了储层物性,是风化壳内有利储层形成的关键;构造作用改造喷溢相下部亚相块状熔岩,形成风化壳下部母岩中裂缝和溶蚀孔隙发育带,构成了风化壳−内幕双层储层结构.以BZ8-3S为原型,建立了“以大中型多中心酸性熔岩火山机构及其发育的有利岩性、岩相为基础,风化和构造改造双控”的大型火山圈闭规模型储层发育模式.In order to solve the problem of finding large-scale volcanic reservoirs in the Mesozoic of Bozhong Depression,Bohai Bay Basin,this paper takes BZ8-3S large volcanic trap and BZ8-3S-A high-yield volcanic exploration well drilled in this structure as the research object,and studies the lithology,lithofacies and reservoir characteristics of volcanic rocks in this structure in detail.The development conditions of the large volcanic trap model reservoir close to the source rock are discussed and the development model of the reservoir is established.The results show that the BZ8-3S structure is composed of several large and medium-sized acid lava volcanic structures and mainly develops three lithological lithofacies,namely porous rhyolite of the upper subfacies of the intermediate effusive facies,massive rhyolite of the lower subfacies and the crypto-explosive breccia subfacies of the volcanic vent facies,forming three types of volcanic reservoirs:high porosity and low permeability,medium porosity and low porosity and low permeability.The medium and large acid lavas with multiple eruption centres,rich upper subfacies of the effusive facies,as well as the upper subfacies of the effusive facies and the crypto-explosive breccia subfacies developed near the source facies of the volcanic mechanism are the basis for the formation of regular model volcanic rock reservoirs.Weathering promoted the formation of pores and fractures in the upper subfacies of the intermediate effusive facies and the crypto-explosive breccia subfacies,improved reservoir physical properties and was key to the formation of favourable reservoirs in the weathered crust.Tectonism transformed the massive lava of the lower subfacies of the effusive facies and formed the fracture and dissolution pore development zone in the parent rock of the lower part of the weathered crust,which formed the weathered crust-internal two-layer reservoir structure.Based on BZ8-3S,the reservoir development model of large-scale volcanic structure is established,which is based

关 键 词：渤中凹陷 BZ8-3S构造 火山岩 规模型储层 储层发育模式 石油地质 

分 类 号：P618.13[天文地球—矿床学]