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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2018  >  40(2): 218-225
ZHAO Ke, SONG Zhangqiang, DU Xuebin, YE Maosong, XIE Xinong, XU Wei. Dolomitization genetic mechanism of carbonate-siliciclastic mixed rock reservoir in CFD-A Tectonic Belt, Bohai Sea[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(2): 218-225. doi: 10.11781/sysydz201802218
Citation: ZHAO Ke, SONG Zhangqiang, DU Xuebin, YE Maosong, XIE Xinong, XU Wei. Dolomitization genetic mechanism of carbonate-siliciclastic mixed rock reservoir in CFD-A Tectonic Belt, Bohai Sea[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(2): 218-225. doi: 10.11781/sysydz201802218
shu

Dolomitization genetic mechanism of carbonate-siliciclastic mixed rock reservoir in CFD-A Tectonic Belt, Bohai Sea

doi: 10.11781/sysydz201802218
  • 1.

    College of Marine Science and Technology, China University of Geoscience(Wuhan), Wuhan, Hubei 430074, China

  • 2. CNOOC Tianjin Company, Tianjin 300452, China

  • 3. Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences(Wuhan), Wuhan, Hubei 430074, China

  • Received Date: 2017-08-17
  • Rev Recd Date: 2018-01-25
  • Publish Date: 2018-03-28
    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 characteristics 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 dolomicrite, 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.

     

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