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Rolling appraisal and high-efficiency development on a lithologic reservoir of nearshore subaqueous fan in the Tanan oilfield
Evaluación y desarrollo de alto impacto en un reservorio litológico de un abánico bajo el agua y cercano a la orilla en el campo petrolífero de Tanan
DOI:
https://doi.org/10.15446/esrj.v28n3.115013Keywords:
Tannan sag, lithologic reservoir, rolling appraisal and development, nearshore subaqueous fan, development strategy (en)hundimiento en el pozo Tanan, reservorio litológico, evaluación y desarrollo, abánico bajo el agua cercano a la orilla, estrategia de desarrollo (es)
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The exploration and development process in the Tanan oilfield is guided by geological insights and the aim of economically beneficial exploitation in foreign oilfields. The study primarily focuses on the sequential exploration and development process of "finding fan, finding reservoir, and finding edge" for the lithologic reservoir of Nantun formation, aligning with current oil prices and available geological resources. By analyzing the detailed anatomy of lithologic reservoirs and development characteristics in the Nantun formation, a geological working method of "searching for uplift and fan before root and edge" has gradually emerged. The lithologic reservoir of Nantun formation is a typical nearshore subaqueous fan lithologic-structural reservoir developed under long-term paleo-uplift in the deep fault period of a faulted lacustrine basin. The combination of paleogeomorphologic restoration and seismic sedimentology is crucial in identifying such reservoirs. Reservoir development is influenced by sedimentary subfacies type, with the middle-fan reservoir exhibiting the best physical properties and higher natural productivity, followed by the fan-root reservoir which shows better well productivity after fracturing. The fan-edge reservoir has comparatively poorer physical properties, with less apparent effects of fracturing. This method has proven to be effective in guiding the rolling appraisal and development of such reservoirs, both domestically and internationally, through detailed geological study.
Los procesos de exploración y desarrollo del campo petrolífero de Tanan se guían por principios geológicos y el objetivo de una explotación económica aplicable en campos petrolíferos en el extranjero. Este estudio se enfoca en la secuencia de exploración y proceso de desarrollo de “encontrar un abánico, encontrar un reservorio, y encontrar sus límites” para el reservorio litológico de la formación de Nantun, en concordancia con los precios actuales del crudo y con los recursos geológicos disponibles. Al analizar la anatomía detallada del reservorio litológico y las características de desarrollo de la formación Nantun, emergió gradualmente el método de trabajo geológico de “buscar el levantamiento y el abánico antes que la raíz y el borde”. El reservorio litológico de la formación de Nantun es un típico abánico bajo el agua de estructura litológica y cercano a la costa que se desarrolló durante el levantamiento del Paleolítico en el período de una falla profunda de una cuenca lacustre fallada. La combinación del restauramiento paleogeomorfológico y la sedimentología sísmica es crucial en la identificación de estos reservorios. El desarrollo del reservorio está influenciado por el tipo de subfacies sedimentarias, donde el abánico intermedio presenta las mejores propiedades físicas y mayor productividad natural, seguido por el abánico de la raíz, que muestra la mejor productividad de pozo tras la fracturación. El abánico del borde del reservorio tiene comparativamente las propiedades físicas más pobres, con menos efectos aparentes en la fracturación. Este método ha demostrado ser efectivo para guiar la evaluación y el desarrollo de dichos yacimientos, tanto a nivel nacional como internacional, mediante un estudio geológico detallado.
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