高温高压条件下碳酸盐岩溶蚀过程控制因素

doi:10.11743/ogg20170415

Abstract

Abstract: In recent years,deep and ultra-deep carbonate reservoirs have shown great potential in petroleum exploration.However,prediction of high quality deep and ultra-deep carbonate reservoirs is constrained by understanding of the mechanism of carbonate dissolution/precipitation.The study on this process could provide insight into the pore development mechanism of petroleum reservoir space.In this study,we conducted dissolution-precipitation experiments simulating surface to deep burial environments.The effects of temperature,pressure,water-rock ratio and dissolved ions on the carbonate dissolution-precipitation process were investigated under conditions from normal temperature and pressure to high temperature and pressure (~200℃~70 MPa) with a series of petrographic and geochemical analytical methods.The results show that the dissolution window curve occurs between 75~150℃ in the open system,and 120~175℃ in the semi-open system.In the open system with 0.3% CO₂ solution,the dissolution capacity of calcite is significantly higher than that of dolomite,while in the semi-open system with 0.3% CO₂ solution,dolomitic limestone has the highest dissolution capacity.In the open system with diluted H₂SO₄ solution,the dissolution capacity of dolostone surpasses that of limestone when the temperature is over 175℃ due to surface-complexation processes of sulfide and cation.

Key words: dolomite, sulfate, dissolution-precipitation, surface complexation, deep-ultra-deep, carbonate rock reservoir

CLC Number:

TE122.2

Ding Qian, He Zhiliang, Wo Yujin, Zhang Juntao, Fan Ming, Yue Xiaojuan. Factors controlling carbonate rock dissolution under high temperature and pressure[J]. Oil & Gas Geology, 2017, 38(4): 784-791.

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Factors controlling carbonate rock dissolution under high temperature and pressure

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