石油实验地质2018，Vol.40Issue(2)：218-225,8.DOI:10.11781/sysydz201802218
渤海海域曹妃甸A构造带混积岩储层白云岩化成因机理分析
Dolomitization genetic mechanism of carbonate-siliciclastic mixed rock reservoir in CFD-A Tectonic Belt, Bohai Sea
摘要
Abstract
The mixed rock is a rock that consists of a mixed deposition of siliciclastic and carbonate.It was dominated by biogenic carbonate in the CFD-A tectonic belt in the Bohai Sea where dolomitization was found. Research on the CFD-A tectonic belt was rarely reported,especially aiming at the genetic mechanism of dolomite reservoir. Based on the observation and identification of cores and rock slices,combined with a number of geochemical tests,the charac-teristics and genetic mechanism of dolomitization in mixed rocks in the first and second members of Shahejie Formation at the CFD-A tectonic belt were studied.Four dolomite types were identified:dolomicrite,bioclastic-containing dolo-micrite,bioclastic dolomite and sand-containing bioclastic dolomite. Further analyses showed that negative bias and positive correlation were both found in carbon and oxygen stable isotopes. Dispersed distribution and large variation were also revealed in oxygen stable isotopes. Dolomitization was found only in bioclastic and its ring cement through microscopic photos,which did not occur in interlocking cementation and bioclast filling.Lake surface fluctuation can be revealed by Mn/Fe,Sr/Ba index,indicating that the tectonic belt has suffered from fresh water leaching because of exposure.Mixed water dolomitization is the dominated genetic mechanism of dolomites in the study area.关键词
成因机理/地球化学/储层/白云岩/沙河街组/曹妃甸A构造带/渤海海域Key words
genetic mechanism/geochemistry/reservoir/dolomite/Shahejie Formation/CFD⁃A tectonic belt/Bohai Sea分类
能源科技引用本文复制引用
赵珂,宋章强,杜学斌,叶茂松,解习农,徐伟..渤海海域曹妃甸A构造带混积岩储层白云岩化成因机理分析[J].石油实验地质,2018,40(2):218-225,8.基金项目
国家自然科学基金项目(41772111)和国家重点基础研究发展计划(973计划)项目(2017CB239102)资助. （41772111）
