首页|Evolution of Diagenetic Fluid of the Dawsonite-Bearing Sandstone in the Jiyang Depression,Eastern China

Evolution of Diagenetic Fluid of the Dawsonite-Bearing Sandstone in the Jiyang Depression,Eastern China

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Based on the petrology,isotope geochemistry and fluid inclusions analysis,we established the evolutionary mode of the diagenetic fluid of dawsonite-bearing sandstone in the Jiyang Depression.Dawsonite-bearing sandstone is characterized by double injection of CO2 and oil-gas in the Jiyang Depression that have experienced a relatively complex diagenetic fluid evolution process.The diagenetic sequence of secondary minerals involves secondary enlargement of quartz,kaolinite,first-stage calcite,dawsonite,second-stage calcite,ferrocalcite,dolomite and ankerite.Hydrocarbon charging in the dawsonite-bearing sandstone occurred at around 2.6-0 Myr.The CO2 charging event occurred during Dongying tectonism,forming the Pingfangwang CO2 gas reservoir,which provided an abundant carbon source for dawsonite precipitation.Carbon and oxygen isotopic compositions of dawsonite demonstrate that CO2 forming the dawsonite was of an inorganic origin derived from the mantle,and that water mediating the proc-ess during dawsonite precipitation was sequestered brine with a fluid temperature of 82℃.The evolutionary sequence of the diagenetic fluid in the dawsonite-bearing sandstone was:alkaline syngenetic fluids,weak alkaline fluids during organic acid forma-tion,acidic fluids in the early stage of CO2 injection,alkaline fluids in the late stage of CO2 injection,and weak alkaline fluids during oil and gas charging.The mode indicates an increase in HCO3-because of the CO2 injection,and the loss of Ca2+ and Mg2+ due to the precipitation of carbonate minerals.Therefore,the evolutionary mode of diagenetic fluids is in good agreement with high HCO3-,low Ca2+ and low Mg2+ composition of the present formation water in the dawsonite-bearing sandstone.

evolution of diagenetic fluiddawsoniteCO2 injection and hydrocarbon chargingmineral diagenetic sequenceiso-topic geochemistryfluid inclusions

LI Fulai、MA Wenkuan、ZHANG Chun、WANG Kaining

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National Key Laboratory of Deep Oil and Gas,China University of Petroleum(East China),Qingdao 266580,China

Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,China

Shandong Geological Exploration Institute of China Chemical Geology and Mine Bureau,Jinan 250013,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of China

4207213041872152

2024

10.1007/s11802-024-5501-8

中国海洋大学学报(自然科学英文版)
中国海洋大学

中国海洋大学学报(自然科学英文版)

CSTPCD
影响因子：0.268
ISSN：1672-5182
年,卷(期)：2024.23(1)
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