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普光气藏含气层系二叠系长兴组—飞仙关组为海相碳酸盐岩。储层受沉积环境和后期成岩作用演化的影响,具有储集岩石类型复杂、储层物性纵横向差异大、储集空间类型多样、储层非均质性强等特点;气藏埋藏深、含气井段长、有边底水、硫化氢含量高,增加了气藏开发难度。为此,围绕气藏产能建设,形成了4种普光气藏地质特征研究方法:①基于测井相—地震相的沉积微相识别方法;②以测井约束稀疏脉冲波阻抗反演为主的储层预测方法;③以测井和测试资料相结合为主的气水层测井识别方法;④以地震数据体结构异常预测含气范围方法。明确了气藏有利沉积相带和优质储层展布规律,预测了有利含气范围,并确定出气层下限。
Puguang gas reservoirs Permian Changxing Formation - Feixianguan Formation marine carbonate rocks. The reservoir is affected by the depositional environment and the evolution of later diagenesis. It has the characteristics of complex types of reservoir rocks, large differences in vertical and horizontal reservoir physical properties, diverse reservoir space types and strong reservoir heterogeneity. The gas reservoirs are deep buried and contain Gas well length, edge water, high hydrogen sulfide content, increasing the difficulty of gas reservoir development. Therefore, four research methods of geological characteristics of Puguang gas reservoirs have been formed around the production capacity of gas reservoirs: (1) identification of sedimentary microfacies based on log facies-seismic facies; (2) logging-constrained sparse impulse impedance inversion Reservoir prediction method; ③ logging and test data based combination of gas and water logging identification method; ④ seismic data structure abnormalities prediction of gas range method. The favorable sedimentary facies belt and high-quality reservoir distribution rules of the gas reservoirs are clearly identified, the favorable gas bearing range is predicted, and the lower limit of the gas zone is determined.