喷发相火山岩储层特征研究及地质意义  

Study on reservoir characteristics of eruptive facies volcanic rock and its geological significance

作　　者：黄金富[1] 王啊丽[2] 夏国朝[1] 刘东成[1] 张海霞[1] HUANG Jinfu;WANG Ali;XIA Guochao;LIU Dongcheng;ZHANG Haixia(Ex ploration and Development Research Institute,Dagang Oil Com pany,Tianjin 300280,China;Oil Production Technology Research Institute,Dagang Oil Company,Tianjin 300280,China)

机构地区：[1]大港油田公司勘探开发研究院,天津300280 [2]大港油田公司采油工艺研究院,天津300280

出　　处：《非常规油气》2023年第6期27-34,共8页Unconventional Oil & Gas

基　　金：中国石油勘探与生产分公司科技项目“大港枣园/王官屯油田提高采收率技术研究与试验”(2022KT0808)。

摘　　要：针对喷发相火山岩岩性复杂、岩相变化快以及产能差异大等问题,以岩石矿物学和储层沉积学等学科理论为指导,综合岩心观察分析、测井资料及生产动态,开展了火山岩储层特征研究。研究结果表明:1)研究区火山岩岩性包括火山角砾岩、气孔玄武岩、凝灰岩和致密玄武岩,其中气孔玄武岩是主要的含油岩石类型,火山角砾岩是局部有效的储层。2)Z35断块火山岩相可以分为喷发沉积相、喷发相、火山通道相和次火山相4个相组,其中喷发相组为双层结构,下部为溢流相,上部为爆发相。3研究区沙三段火山岩自下而上划分为3期(Ⅰ~Ⅲ),其中Ⅲ期溢流相和爆发相厚度最大、分布最广,为主要储集层。4)研究区主要储层分布在Ⅱ期和Ⅲ期,储集空间类型有孔隙型、气孔型、气洞型和裂缝型,高产井主要分布在储集空间发育的气孔玄武岩区域。5)火山岩亚相即爆发相和溢流相,采用爆发指数划分出气孔玄武岩微相、火山角砾岩微相、凝灰岩微相和致密玄武岩微相4个微相。以上成果认识为后期开发调整提供了地质依据。In view of the problems of complex lithology,rapid lithofacies changes and significant differences in pro-ductivity of eruptive facies volcanic rocks,guided by the theories of rock mineralogy,reservoir sedimentology and other disciplines,based on comprehensive core observations and analysis,logging data and production performance,research on the characteristics of volcanic rock reservoirs is carried out.The results of the study shows that:1)The lithologies of volcanic rocks in the study area include volcanic breccia,stomatal basalt,tuff and tight basalt,among which stomatal basalt is the main oil-bearing rock type,volcanic breccia is a locally effective reservoir,2)Z35,the faulted volcanic block facies can be divided into four facies groups:eruptive sedimentary facies,eruptive facies,vol-canic channel facies and sub-volcanic facies,among which the eruptive facies group has a double-layer structure,the lower part is the overflow facies and the upper part is the eruption facies.3)The volcanic rocks of Sha3 Member in the study area can be classified into three stages(Ⅰ~Ⅲ)from bottom to top,the overflow facies and explosive faci-es of stage Ⅲ have the largest thickness and the widest distributions making them the main reservoirs.4)The main reservoirs in the study area are distributed in stage Ⅱ and stage Ⅲ,the types of reservoir space include pore,porosi-ty,gas cave and fracture,the high production wells are mainly distributed in the well-developed reservoir spaces in stomatal basalt.5)The volcanic rock subfacies including eruptive facies and overflow facies are divided into four mi-crofacies using eruptive indexes i.e.,stomatal basalt microfacies,volcanic breccia microfacies,tuff microfacies and tight basalt microfacies.The above achievements provide a geological basis for later developments and adjustments.

关 键 词：喷发相 火山岩 岩相 期次 

分 类 号：TE112.23[石油与天然气工程—油气勘探]