摘要
四川盆地灯影组二段(灯二段)微生物丘滩体是近年地质研究和油气勘探的热点,为刻画不同相带丘滩体的结构及沉积模式,以更好指导油气勘探,综合典型剖面实测、岩石薄片鉴定、无人机航拍建模等方法,解剖了灯二段微生物丘滩体的结构,并建立了微生物丘滩体沉积模式。灯二段微生物丘滩体主要发育纹层叠层石白云岩、残余颗粒白云岩、角砾状白云岩、凝块石白云岩、泡沫绵层白云岩、泥晶白云岩和葡萄花边白云岩,可划分出丘基、丘核、丘翼、丘坪和丘盖5种微相。丘基岩性主要为纹层状白云岩,丘核岩性主要为叠层石白云岩、凝块石白云岩和泡沫绵层白云岩,丘翼岩性主要为砂屑砾屑白云岩,丘坪岩性主要为砂屑白云岩和角砾状白云岩,丘盖岩性主要为纹层白云岩和泥晶白云岩。四川盆地发育斜坡型、台缘外带型、台缘内带型和台内型4类微生物丘滩体。斜坡型微生物丘滩体位于斜坡相区,纵向上表现为丘基-丘核-丘盖的微相组合;台缘外带型微生物丘滩体位于台缘外带相区,与丘前斜坡沉积共生,纵向上表现为丘基-丘核-丘翼-丘坪的微相组合;台缘内带型微生物丘滩体位于台缘内带相区,与丘后潟湖沉积共生,纵向上表现为丘基-丘核-丘翼-丘坪的微相组合;台内型微生丘滩体位于台内相区,与台坪共生,整体表现为丘核与丘翼交替发育。整体上,不同类型的微生物丘滩体具有“垂向叠置、平面连续”的发育特征,基于不同相带、不同类型微生物丘滩丘滩体的结构剖析,建立了四川盆地灯二段台内-台缘内带-台缘外带-斜坡的微生物丘滩体沉积模式。研究认识对于寻找并刻画灯二段优质储层具有重要指导与借鉴意义。
Microbial mound-bank complex in Member 2 of Dengying Formation in Sichuan Basin have been a hot spot of geological research and oil-gas exploration in recent years.To characterize the framework and sedimentary model of mound-bank complex in different facies zones,and to better guide oil-gas exploration,the framework of microbial mound-bank complex in Member 2 of Dengying Formation were dissected and their sedimentary model was established using typical section measurement,rock thin section identification,and drone aerial photography modeling.The microbial mound-bank complex in Member 2 of Dengying Formation are dominated by laminated stromatolite dolomite,relict-granule-bearing dolomite,breccia dolomite,thrombolite dolomite,foam spongy dolomite,micrite dolomite and grape-lace shaped dolomite,which can be divided into five microfacies including mound base,mound core,mound flank,mound flat and mound cap.The lithology of mound base is mainly laminated dolomite,that of mound core is mainly stromatolite dolomite,thrombolite dolomite and foam spongy dolomite,that of mound flank is mainly psammitic dolomite and dolorudite,that of mound flat is mainly psammitic dolomite and breccia dolomite,and that of mound cap is mainly laminated dolomite and micrite dolomite.There are 4 types of microbial mound-bank complex developed in slope,platform margin outer zone,platform margin inner zone and intra-platform zone of Sichuan basin,respectively.In the slope,the microbial mound-bank complex are located in the slope facies area,longitudinally shown as the microfacies combination of mound basemound core-mound cap;in the platform margin outer zone,they are developed in the facies area and in paragenesis with slope deposits in front of the mound,longitudinally shown as the microfacies combination of mound base-mound core-mound flank-mound flat;in the platform margin inner zone,they are located in the facies area and in paragenesis with the lagoon deposits behind the mound,longitudinally shown as the microfacies combination of mound bas
作者
任佳鑫
宋金民
刘树根
赵容容
罗忠
李智武
金鑫
马行陟
李柯然
叶玥豪
丁一
李文皓
赵玲丽
田立洲
Ren Jiaxin;Song Jinmin;Liu Shugen;Zhao Rongrong;Luo Zhong;Li Zhiwu;Jin Xin;Ma Xingzhi;Li Keran;Ye Yuehao;Ding Yi;Li Wenhao;Zhao Lingli;Tian Lizhou(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Sichuan Chengdu 610059,China;Xihua University,Sichuan Chengdu 610039,China;Exploration Division,PetroChina Southwest Oil&Gasfield Company,Sichuan Chengdu 610041,China;PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China)
出处
《石油学报》
EI
CAS
CSCD
北大核心
2023年第2期312-328,共17页
Acta Petrolei Sinica
基金
国家自然科学基金面上项目(No.41872150)
国家自然科学基金企业创新发展联合基金项目(No.U19B6003)资助。
关键词
四川盆地
灯影组二段
微生物丘滩体
丘滩体结构
微相组合
沉积模式
Sichuan Basin
Member 2 of Dengying Formation
microbial mound-bank complex
mound-bank complex structure
microfacies assemblage
sedimentary model
