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<p>Studying platform margin architecture will help understand mound-shoal reservoir development. Based on the latest drilling practices and geological and geophysical data, the structure types and evolution process of the Cambrian platform margin are studied in the Tarim Basin. The results show that different platform margin structures developed in the northern and southern margin of the Tarim Basin, and underwent different evolution processes. In the north, it was a carbonate ramp with progradational grain shoals from SQ1 to SQ3. From SQ4 to SQ6, it was a rimmed carbonate platform with aggradational mound shoals. In SQ7, it was a karst carbonate platform with big wedge-shaped mound shoals. In the south, no SQ1 sequence occurred in the Cambrian, it was a carbonate ramp with grain shoals from SQ2 to SQ3. From SQ4 to SQ7, it was a weakly rimmed platform with progradational mound shoals. Research shows that the varying tectonic and sea level fluctuations are crucial to the evolution difference of platform margin. In the south, due to the Tanan paleoland at the beginning of the Early Cambrian time, where the SQ1 is missing, the terrain gradient is slight, the carbonate production rate is low, and a progradational platform margin developed. In the north, because it is far from the Tanan paleoland, the carbonate production rate is high, the terrain gradient is large, and an aggradational platform margin developed. At the end of the Cambrian, the Tabei uplift gradually rises, and the SQ7 in the north underwent denudation and karstification, forming a karst platform margin with karst caves. The aggradational and karst platform margin architectures of the SQ6 and SQ7 in the north can form a larger-scale mound-shoal karst reservoir. The progradational ramp platform margin shoals of SQ2 and SQ3 in the south are close to the inherited paleouplift, always toward oil and gas migration, and can form quasicontinuous shoal reservoirs. This study provides a direction for the differential evaluation of carbonate platform marginal mound shoal reservoirs.</p>

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Structural types and differential evolution of Cambrian carbonate platform margin in the northern and southern Tarim Basin, NW China

  • 期刊论文

  • 发表日期：

    2025年4月26日

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  • Xingliang Deng,
  • Yintao Zhang,
  • Fangfang Chen,
  • Chong Sun,
  • San Zhang

摘要

Studying platform margin architecture will help understand mound-shoal reservoir development. Based on the latest drilling practices and geological and geophysical data, the structure types and evolution process of the Cambrian platform margin are studied in the Tarim Basin. The results show that different platform margin structures developed in the northern and southern margin of the Tarim Basin, and underwent different evolution processes. In the north, it was a carbonate ramp with progradational grain shoals from SQ1 to SQ3. From SQ4 to SQ6, it was a rimmed carbonate platform with aggradational mound shoals. In SQ7, it was a karst carbonate platform with big wedge-shaped mound shoals. In the south, no SQ1 sequence occurred in the Cambrian, it was a carbonate ramp with grain shoals from SQ2 to SQ3. From SQ4 to SQ7, it was a weakly rimmed platform with progradational mound shoals. Research shows that the varying tectonic and sea level fluctuations are crucial to the evolution difference of platform margin. In the south, due to the Tanan paleoland at the beginning of the Early Cambrian time, where the SQ1 is missing, the terrain gradient is slight, the carbonate production rate is low, and a progradational platform margin developed. In the north, because it is far from the Tanan paleoland, the carbonate production rate is high, the terrain gradient is large, and an aggradational platform margin developed. At the end of the Cambrian, the Tabei uplift gradually rises, and the SQ7 in the north underwent denudation and karstification, forming a karst platform margin with karst caves. The aggradational and karst platform margin architectures of the SQ6 and SQ7 in the north can form a larger-scale mound-shoal karst reservoir. The progradational ramp platform margin shoals of SQ2 and SQ3 in the south are close to the inherited paleouplift, always toward oil and gas migration, and can form quasicontinuous shoal reservoirs. This study provides a direction for the differential evaluation of carbonate platform marginal mound shoal reservoirs.