摘要
依据野外及钻井岩心的宏观、微观特征,结合相应的地化资料,对川北地区灯影组灯二段的储层特征及主要控制因素进行了较为详细的研究。研究认为,其储集岩主要为颗粒粘连白云岩、藻叠层白云岩和白云质岩溶角砾岩,储集空间以次生成因的藻粘连格架溶孔、顺层溶孔—溶洞—溶缝和穿层葡萄花边溶洞最为常见,储层类型多为孔洞型,常规物性具有低孔—低渗特征;颗粒粘连滩和藻丘为区内优质储层的发育提供物质基础,压实—压溶和多期胶结作用是原生孔隙消失的基本原因,桐湾运动Ⅰ幕导致的表生岩溶作用是储层形成的关键。颗粒粘连滩、藻丘与表生岩溶水平潜流带的叠加使其储层主要分布在灯二段的中部。该研究结果可为川北地区震旦系灯影组油气勘探提供依据。
On the basis of the macroscopic and microscopic characteristics and geochemical data from both outcrops and drilling cores,this study is devoted to the detailed investigation of reservoir characteristics of the 2 nd Member of Dengying Formation and main controlling factors in northern Sichuan.As the data shows,the reservoir rocks mainly consist of grain conglutinate dolomites,stromatolitic algal dolomites and dolomitic karst breccia.In terms of reservoir space,the reservoirs are dominated by dissolved pores in the algae-adherent rocks,cave-dissolving cavities,karst-dissolve joints and grape cambiums.Most of the reservoirs belong to the hole type,which are characterized by low porosity and low permeability.High-quality reservoirs of the region are composed of the materials from particle gluten beach and algae mound.Compaction-pressure solution and multi-stage cementation are the main reasons to the disappearance of primary pores.Moreover,the epigenetic karst resulted from the EpisodeⅠof Tongwan movement played important role in reservoir forming.The combination of all the processes mentioned above make the reservoirs mainly distributed in the middle and upper part of the 2 nd Member of Dengying Formation.
作者
杜垚
王兴志
张巧依
冯明友
曾德明
张本健
裴森奇
DU Yao;WANG Xingzhi;ZHANG Qiaoyi;FENG Mingyou;ZENG Deming;ZHANG Benjian;PEI Senqi(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu 610500,China;Southwest Petroleum University,Chengdu 610500,China;BGP Southwest Geophysical Research Institute CNPC,Chengdu 610056,China;Northwest Division of PetroChina Southwest Oil Gas Field Company,Jiangyou 621709,Sichuan,China)
出处
《海洋地质前沿》
CSCD
2018年第10期53-59,共7页
Marine Geology Frontiers
基金
国家油气重大专项(专题)"全球性海侵(湖侵)与气候变化对大型地层油气藏形成的控制作用"(2017ZX05001001-002)
国家自然科学基金"四川盆地震旦系灯影组葡萄状构造精细研究"(41402126)
关键词
灯影组
储层
藻白云岩
主控因素
四川盆地
Dengying Formation
reservoir
algae dolomite
controlling factor
Sichuan Basin
