渤海湾盆地辽河坳陷房身泡组玄武岩储层特征及油气勘探潜力  

Reservoir characteristics and hydrocarbon exploration potential of the basalts in Paleogene Fangshenpao formation of Liaohe depression,Bohai Bay basin

作　　者：王思琪 黄玉龙[1] 冯玉辉 刘兴周[3] 韩旭[1] WANG Siqi;HUANG Yulong;FENG Yuhui;LIU Xingzhou;HAN Xu(College of Earth Sciences,Jilin University,Changchun 130061,China;College of Paleontology,Shenyang Normal University,Shenyang 110034,China;Research Institute of Liaohe Oilfield,CNPC,Panjin 124010,China)

机构地区：[1]吉林大学地球科学学院,吉林长春130061 [2]沈阳师范大学古生物学院,辽宁沈阳110034 [3]中国石油辽河油田分公司勘探开发研究院,辽宁盘锦124010

出　　处：《中国矿业》2020年第5期173-177,共5页China Mining Magazine

基　　金：国家自然科学基金项目资助(编号:41702128);中国石油天然气股份有限公司重大科技专项资助(编号:2017E-1601)。

摘　　要：基于钻井岩芯资料,通过岩芯描述、薄片鉴定、扫描电镜分析和储层物性测试等方法,对渤海湾盆地辽河坳陷房身泡组玄武岩储层特征进行了系统研究,并探讨了其油气勘探潜力。辽河坳陷房身泡组玄武岩共发育2大类6种基本岩石类型,划分为4种岩相10种亚相,反映为陆上溢流式喷发形成。识别出4类8种储集空间类型,有效孔隙主要为气孔充填残余-溶蚀孔、节理缝和构造缝。玄武岩孔隙度介于2.9%~21.8%之间,渗透率介于0.01~9.0×10^-3μm^2之间,总体上为中-高孔、低渗储层,气孔-裂缝分带性和界面溶蚀改造作用与储层物性密切相关。房身泡组顶面以下30m范围内为含油显示的有利层段,溢流相复合熔岩流亚相和爆发相火山碎屑流亚相含油性相对较好,构成房身泡组玄武岩油气勘探的优势相带。Systematic researches had been done on reservoir characteristics of basalts in Fangshenpao formation of Liaohe depression,while hydrocarbon exploration potential is discussed on the basis of observation and characterization of borehole core and thin sections,scanning electron microscopic analysis and reservoir property tests.Basalts of Fangshenpao formation are divided into two categories and six types of lithologies,which are furtherly classified into four lithofacies and ten subfacies,indicating being formed by subaerial magma effusive eruptions.Four categories and eight types of pore spaces are identified in basaltic rocks,among which there are primarily three types of effective porosities including partially filled and dissolved vesicles,contraction joints and tectonic fractures.Porosity of basalts are between 2.9%and 21.8%,and permeability ranges from 0.01×10-3μm2 to 9.0×10^-3μm^2,indicating medium-high porosity and low permeability.Reservoir properties of basaltic reservoirs are close related to zonation of vesicles and joints as well as intense dissolution adjacent to boundaries.Generally,proliferous intervals with good oil shows are from the top of Fangshenpao formation to the depth of thirty meters below,while compound lava flow of effusive facies and pyroclastic flow of explosive facies are two principle types of high-quality reservoirs which should be takes as major hydrocarbon exploration targets of the basaltic successions in the deep part of Liaohe depression.

关 键 词：玄武岩 储层特征 油气勘探潜力 辽河坳陷 渤海湾盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]