摘要
根据地震、钻井及薄片等资料,采用地震波阻抗储层反演技术,对滨里海盆地东缘石炭系盐下碳酸盐岩储层特征、油气成藏规律进行了研究,并指出了下一步风险勘探方向。研究结果表明:①滨里海盆地东缘石炭系盐下碳酸盐岩储层可分为灰岩类、云岩类、云灰岩/灰云岩类、硅化硅质岩类等,储层孔隙度为4%~12%,渗透率通常小于1 mD,属于低—中孔、低渗孔洞-孔隙型储层。②研究区阿克若尔构造带主要发育岩性油气藏,无统一油水界面,油层呈薄层状分散分布,对比性和连续性均较差,优质储层多为高频三级层序旋回中上部的高生长率滩体及不整合面附近的岩溶储层。③采用基于层位-测井约束的初始模型的地震波阻抗储层反演技术预测碳酸盐岩薄储层,可更清晰地呈现KT-Ⅰ和KT-Ⅱ油层组储层的纵、横向展布特征。研究区有利储层主要发育在KT-Ⅱ油层组顶部的G1和G4小层。
Based on seismic,drilling and thin section data,seismic wave impedance reservoir inversion technology was used to study the characteristics and hydrocarbon accumulation rules of Carboniferous subsalt carbonate reservoirs in the eastern margin of Pre-Caspian Basin,and the next risk exploration direction was pointed out.The results show that:(1)Carboniferous subsalt carbonate reservoirs in the eastern margin of Pre-Caspian Basin can be divided into limestones,dolomites,dolomitic limestones,calcareous dolomites,silicified siliceous rocks.The reservoir porosity is 4%-12%,and the permeability is generally less than 1 mD,belonging to lowmedium porosity and low permeability vug-pore reservoirs.(2)Lithologic reservoirs are mainly developed in Aknol structural belt in the study area,without uniform oil-water contact.The oil layers are distributed in thin layers,with poor correlation and continuity.High-quality reservoirs are mostly high growth rate beach bodies in the upper part of high-frequency third-order sequence cycles and karst reservoirs near unconformity surfaces.(3)The seismic wave impedance reservoir inversion technology based on the initial model constrained by horizon and logging was used to predict thin carbonate reservoirs,which can more clearly show the horizontal and vertical distribution characteristics of KT-Ⅰand KT-Ⅱreservoir groups.The favorable reservoirs in the study area are mainly developed in G1 and G4 sublayers at the top of KT-Ⅱreservoir group.
作者
王雪柯
王震
计智锋
尹微
姜仁
侯珏
张艺琼
WANG Xueke;WANG Zhen;JI Zhifeng;YINWei;JIANG Ren;HOU Yu;ZHANG Yiqiong(PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China)
出处
《岩性油气藏》
CAS
CSCD
北大核心
2023年第6期54-62,共9页
Lithologic Reservoirs
基金
中国石油天然气股份有限公司“海外深层油气成藏机制与勘探评价技术研究”(编号:2021DJ3102)资助。
关键词
波阻抗储层反演
孔洞-孔隙型储层
滩体
岩溶储层
成藏规律
岩性油气藏
盐下碳酸盐岩
石炭系
滨里海盆地
wave impedance reservoir inversion
vug-pore reservoir
beach body
karst reservoir
accumulation rule
lithologic reservoir
subsalt carbonate
Carboniferous
Pre-Caspian Basin
