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Mechanism for calcite dissolution and its contribution to development of reservoir porosity and permeability in the Kela 2 gas field,Tarim Basin,china

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Science china Earth Sciences 2008年第4期51卷 567-578页

作者： yu bingsong1,3, dong hailliang2.3 & ruan zhuang1,3 1 state key laboratory of geological processes and mineral resources, china university of geosciences, beijing 100083, china 2 Department of Geology, Miami university,Oxford, OH 45056, USA 3 Geomicrobiology laboratory, china university of geosciences, beijing, 100083, china state key laboratory of geological processes and mineral resources China University of Geosciences Department of Geology Miami University Geomicrobiology laboratory China University of Geosciences

This study is undertaken to understand how calcite precipitation and dissolution contributes to depth-related changes in porosity and permeability of gas-bearing sandstone reservoirs in the Kela 2 gas field of the Tarim Basin, Northwestern china. Sandstone samples and pore water samples are col-lected from well KL201 in the Tarim Basin. Vertical profiles of porosity, permeability, pore water chem-istry, and the relative volume abundance of calcite/dolomite are constructed from 3600 to 4000 m below the ground surface within major oil and gas reservoir rocks. Porosity and permeability values are in-versely correlated with the calcite abundance, indicating that calcite dissolution and precipitation may be controlling porosity and permeability of the reservoir rocks. Pore water chemistry exhibits a sys-tematic variation from the Na2SO4 type at the shallow depth (3600-3630 m), to the NaHCO3 type at the intermediate depth (3630―3695 m),and to the CaCl2 type at the greater depth (3728―3938 m). The geochemical factors that control the calcite solubility include pH, temperature, pressure, Ca2+ concen-tration, the total inorganic carbon concentration (ΣCO2), and the type of pore water. Thermodynamic phase equilibrium and mass conservation laws are applied to calculate the calcite saturation state as a function of a few key parameters. The model calculation illustrates that the calcite solubility is strongly dependent on the chemical composition of pore water, mainly the concentration difference between the total dissolved inorganic carbon and dissolved calcium concentration (i.e., [ΣCO2] -[Ca2+]). In the Na2SO4 water at the shallow depth, this index is close to 0, pore water is near the calcite solubility. Calcite does not dissolve or precipitate in significant quantities. In the NaHCO3 water at the intermedi-ate depth, this index is greater than 0, and pore water is supersaturated with respect to calcite. Massive calcite precipitation was observed at this depth interval and

关键词： calcite dissolution porosity thermodynamic Tarim Basin

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Carbonate reservoirs modified by magmatic intrusions in the Bachu area,Tarim Basin,NW china

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Geoscience Frontiers 2015年第5期6卷 779-790页

作者： Kang Xu bingsong yu Hanning Gong zhuang ruan Yinglu Pan Yan Ren state key laboratory of geological processes and mineral resources School of Earth Sciences and ResourcesChina University of Geosciences

Oil and gas exploration in carbonate rocks was extremely successful in recent years in the Ordovician in Tarim *** ***,we investigate the carbonate reservoirs in the Bachu area of the Tarim Basin through petrological and geochemical studies combined with oil and gas exploration *** analysis included the major,trace,and rare earth elements;fluid inclusion thermometry;clay mineral characterization;and carbon and oxygen isotopes of the carbonate *** temperatures of the fluid inclusions of Well He-3 in the Bachu area indicate three groups,60-80 ℃,90-130 ℃,and 140-170 ℃,and suggest that the carbonate rocks experienced modification due to heating *** porosity in the reservoir is defined by fractures and secondary pores,and there is a notable increase in the porosity of the carbonate reservoirs in proximity to magmatic intrusion,particularly approximately 8-10 m from the intrusive *** development of secondary pores was controlled by lithofacies and corrosion by various *** identify supercritical fluids with high density（138.12-143.97 mg/cm3） in the Bachu *** negative correlations of δ13C（-2.76‰ to-0.97‰） and δ18O（-7.91‰ to-5.07‰） suggest that the carbonate rocks in the study area were modified by high-salinity hydrothermal *** formation of clay minerals,such as illite and montmorillonite,caused a decrease in *** study demonstrates the effect of magmatic intrusions in modifying the reservoir characteristics of carbonate rocks and has important implications for oil and gas exploration.

关键词： Carbonate rocks Petrology and geochemistry Oil and

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