什邡气田蓬莱镇组气藏测井解释精细模型及老井二次解释应用

Refined Log Interpretation Model and Secondary Evaluation of Old Wells in the Penglaizhen Formation Gas Reservoir, Shifang Gas Field

摘要: 什邡气田蓬莱镇组以三角洲平原与前缘沉积控制，小层间岩性、物性、电性及含气性(四性)差异显著，导致气藏评价复杂度高。本研究基于岩心数据，系统分析了蓬一、蓬二、蓬三气藏储层四性关系，分小层构建了孔隙度和渗透率测井解释精细模型。通过模型对什邡气田部分生产数据与初期解释不符的单井进行了二次评价，二次解释结论与实际测试情况一致。结果表明：分小层建立的测井解释精细模型具有较高精度，该模型为老井潜力层识别与开发方案优化提供了可靠依据，对气藏稳产具有重要意义。

Abstract: The Penglaizhen Formation in the Shifang Gas Field is dominated by delta plain and delta front subfacies. However, due to rapid variations in the four-property characteristics across different sublayers, the gas-bearing behavior of the entire reservoir exhibits significant complexity. Based on core data, this study systematically investigates the relationships among lithology, physical properties, electrical properties, and gas-bearing potential for the Peng-1, Peng-2, and Peng-3 gas reservoirs. A refined log interpretation model for porosity and permeability was established for each sublayer in the target intervals. The model was applied to conduct secondary log interpretation for wells in the Shifang Gas Field where initial log interpretations conflicted with production results. The revised interpretations align closely with actual test data. The results demonstrate that the sublayer-specific refined log interpretation model achieves high accuracy, providing reliable geological parameters for re-evaluating legacy wells. This approach holds practical significance for sustaining stable production in the Penglaizhen Formation gas reservoirs of the Shifang Gas Field.