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Characteristics and dolomitization of the Lower Qiulitage Group reservoir in Bachu Uplift, Tarim Basin, China
Características y dolomitización del reservorio del Grupo Qiulitage Inferior en el levantamiento de Bachu, Cuenca de Tarim, China
DOI:
https://doi.org/10.15446/esrj.v23n3.81914Keywords:
Bachu uplift, Lower Qiulitage Group, Crystal Dolomite, Hydrothermal Dolomitization, Buried Dissolution, (en)levantamiento de Bachu, Grupo Qiulitage inferior, Dolomita de cristal, Dolomitización Hidrotermal, Disolución enterrada. (es)
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The characteristics of the Lower Qiulitage Group in Bachu uplift, which originated in the Upper Cambrian period, are not clear. Based on four core observations, identification of 40 thin sections, and geochemical analysis of samples, this study concludes that crystal dolomite reservoirs developed in the Lower Qiulitage Group in Bachu uplift. Intercrystalline pores and dissolved pores formed the main reservoir space, while dissolution pores and fractures were developed in the middle and bottom part of the formation. The reservoir features low porosity and low permeability, and the fine-medium crystalline dolomite reservoir has the best pore structure. According to a petrochemical analysis, the Lower Qiulitage Group reservoir experienced intense dolomitization, with slightly higher content of trace elements Mn and Sr and negative oxygen isotropy. Tectonic hydrothermal dolomitization developed locally under the influence of base faults, and vug pores were filled with saddle dolomites and siliceous filling. The presence of rare earth elements Ce and Eu presented positive anomaly characteristics. It suggested that the CO2 acid dissolution caused by hydrothermal fluids may be a new mechanism for the increase in pores in deeply buried reservoirs, which is worth further study.
Las características del Grupo Qiulitage Inferior en el levantamiento de Bachu, que se originó en el período Cámbrico Superior, no están claras. Basado en cuatro observaciones centrales, la identificación de 40 secciones delgadas y el análisis geoquímico de muestras, este estudio concluye que los reservorios de dolomita de cristal se desarrollaron en el levantamiento del Grupo Qiulitage Inferior en Bachu. Los poros intercristalinos y los poros disueltos formaron el espacio del depósito principal, mientras que los poros de disolución y las fracturas se desarrollaron en la parte media e inferior de la formación. El reservorio presenta baja porosidad y baja permeabilidad, y el reservorio de dolomita cristalina fina-media tiene la mejor estructura de poros. Según un análisis petroquímico, el reservorio del Grupo Qiulitage inferior experimentó una intensa dolomitización, con un contenido ligeramente mayor de oligoelementos Mn y Sr e isotropía de oxígeno negativa. La dolomitización hidrotermal tectónica se desarrolló localmente bajo la influencia de fallas de base, y los poros vug se llenaron con dolomitas de silla y relleno silíceo. La presencia de elementos de tierras raras Ce y Eu presentó características de anomalías positivas. Esto sugirió que la disolución de ácido de CO2 causada por los fluidos hidrotermales puede ser un nuevo mecanismo para el aumento de poros en depósitos profundamente enterrados, lo que merece un estudio más profundo.
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