摘要
巴西盐下湖相碳酸盐岩是现今海外油气勘探的热点领域,但中国关于该类储层特征的研究相对薄弱。通过综合应用岩心、薄片、物性测试等资料,系统研究了储层岩石类型、储集空间类型、储层物性特征、成岩作用类型及其对物性的影响情况。研究表明微生物灰岩和生物碎屑灰岩是盆地的主要储层类型,其中微生物灰岩由叠层石和鲕粒灰岩互层组成,生物碎屑灰岩由贝壳灰岩组成。盐下微生物灰岩储层的孔隙类型以溶孔、晶间孔、粒间孔等次生孔隙和受过改造的原生孔隙为主;生物碎屑灰岩储层的孔隙类型以铸模孔、溶孔、溶洞及晶间孔为主。盐下湖相碳酸盐岩储层整体物性较好,具有中-高孔渗特征;白云岩化和溶蚀作用是改善盐下湖相碳酸盐岩储层的主要成岩作用类型,储层主要处于中成岩阶段,少量处于早成岩阶段。
Exploration in pre-salt lacustrine carbonate rocks has been one of the hottest topics for recent years in oil-gas industry.However,the study of the characters of such type of reservoir remains relatively poor.Based on drilling-cores,thin sections,physical property data,etc.,this paper comprehensively investigated reservoirs petrological characteristics,porosity space types,physical properties,diagenesis and their effects.It shows that microbilite and bioclastic limestone are dominant reservoir rocks.The former consists of stromatolite and oolite and the latter of coquina.The major porosity types in microbialite include secondary porosity,such as dissolved pores,intercrystalline pores,interparticle pores,and diagenetic-altered pores.And the coquina is dominated by moldic pores,dissolved pores,vugs and intercrystalline pores.Pre-salt lacustrine carbonate usually has medium-high porosity and permeability.It also suggests that both dolomitization and dissolution have positive influences on reservoir properties.The reservoir rocks are mainly iformed under meso-diagenesis,except a few which may remain in the stage of early diagenesis.
作者
康洪全
吕杰
程涛
贾怀存
白博
KANG Hongquan;LV Jie;CHENG Tao;JIA Huaicun;BAI Bo(CNOOC Research Institute,Beijing 100028,China)
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2018年第4期170-178,共9页
Marine Geology & Quaternary Geology
基金
国家"十三五"科技重大专项"西非-南美海域重点区油气地质评价及关键技术研究"(2017ZX05032-001)
关键词
湖相碳酸盐岩
储层特征
巴西
桑托斯盆地
lacustrine carbonate
reservoir character
Brazil
Santos Basin
