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Reconstruction of Acid Fluid on Clastic Reservoir in Saline Lacustrine Basin
Pages: 52-60
Year: Issue:  3
Journal: Journal of Earch Sciences and Environment

Keyword:  saline lacustrine basinorganic acidhigh-temperature and high-pressureplastercalciteankeritechloriteQaidam Basin;
Abstract: The sedimentary environment in the south area of western Qaidam Basin is mainly saline lacustrine basin in Cenozoic. Saline environment improves the conversion rate of hydrocarbon,but the control on reservoir is not clear.Based on the high-temperature and high-pressure test,the physical-chemical reaction between diagenetic fluid and mineral in geological condition was simulated, and the reconstruction of organic acid produced in the process of evolution of organic matter on reservoir in saline environment was discussed.The results show that the dissolution of acid fluid on mineral increases the porosity,but the change of permeability is different;when the rocks contain plaster and ankerite,the ankerite dissolves easily under the catalysis of plaster,and Fe2+ and Mg2+ formed by the chemical reaction improve the conversion of kaolinite to needle-shaped chlorite, and consequently pore throat blocked decreases the permeability;the precipitation of calcite in high-temperature and high-pressure stratum is caused by the development of plaster in rock,and the plaster dissolves more easier than the calcite under the same condition;the supersaturated Ca causes the precipitation of calcite,and the porosity of rock increases because the reservoir space reduced by precipitation of calcite is less than that released by the dissolution of deliquescent minerals such as plaster and feldspar.
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