渤海海域BZ19-6区块变质岩潜山储层特征与优势岩性序列探讨  

Reservoir characteristics and superior lithology sequences of metamorphic buried-hill at BZ19-6,Bohai bay Basin

作　　者：谭忠健 邓津辉 李东[2] 易雪斐[3] 李鸿儒 符强 张贵斌[2] TAN Zhongjian;DENG Jinhui;LI Dong;YI Xuefei;LI Hongru;FU Qiang;ZHANG Guibin(Tianjin Branch,CNOOC China Limited,Tianjin 300452,China;China Oilfield Services Limited,Tianjin 300452,China;School of Geosciences,Yangtze University,Wuhan 430100,China;EnerTech-Drilling&Production Co.,CNOOC Energy Development Co.Ltd.,Tianjin 300452,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]中海油田服务股份有限公司,天津300452 [3]长江大学地球科学学院,湖北武汉430100 [4]中海油能源发展股份有限公司工程技术分公司,天津300452

出　　处：《中南大学学报（自然科学版）》2024年第1期365-374,共10页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41702116);中海石油(中国)有限公司重大科技专项(CNOOC-KJ 135ZDXM36 TJ 08 TJ)。

摘　　要：对渤海BZ19-6区块变质岩潜山数口钻井的铸体薄片、常规物性等数据展开综合分析,依据矿物组成和岩石结构、构造等建立该区块变质岩的岩性划分方案。研究结果表明:除黑云二长片麻岩、黑云斜长片麻岩和黑云钾长片麻岩外,其余变质岩的浅色矿物(石英、长石为主)含量均较高,暗色矿物(黑云母等)含量较低;有效储集空间主要为构造运动产生的未充填裂缝和斜长石的粒内溶孔;当石英含量为25%~35%(体积分数)、斜长石比率为0.4~0.6时,物性最好;碎裂岩、二长片麻岩、二长混合花岗岩、斜长混合花岗岩的浅色矿物含量高,孔隙度和渗透率高,是形成优势储层最有利的变质岩岩性。但是,各岩性之间的浅色矿物含量、物性、抗压强度等相差不显著,指示岩性确实起到基础作用,但是构造作用可能是有利储层形成最主要的控制因素之一。All the rock thin sections,conventional physical properties and other data from more than ten wells in BZ19-6 block,Bohai sea were comprehensively analyzed.The lithology division scheme of metamorphic rock in this block,including granitic gneiss,cataclastic rock and granulite was constructed.The results show that the content of light minerals(mainly quartz and feldspar)of this lithology is very high,and the content of dark minerals(biotite,etc.)is low,respectively.The effect reservoirs contain micro-cracks and intragranular dissolved pores.When the content of quartz is between 25%and 35%,and the ratio of plagioclase/(plagioclase+alkali feldspar)is between 0.4 and 0.6;The cataclastic rock,monzonitic gneiss,monzonitic mixed granite and plagioclase mixed granite are the best metamorphic rocks forming good reservoirs,based on the high content of light minerals,high values of porosity and permeability.It shows that the superior lithology sequence is influenced by lithology in basically,but tectonic movement is also one of the main controlling factors.

关 键 词：变质岩潜山 渤海油田 优势岩性序列 有利储层 主控因素 

分 类 号：TE51[石油与天然气工程—油气田开发工程]