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松辽盆地徐家围子断陷深层火山岩储层具有埋藏深、温度高、压力大、物性差、非均质性强的特征。为了预测火山岩储层类型和质量在平面上的变化规律,本文讨论了影响火山岩储层物性的主要地质因素。结果表明,火山岩的物性主要受火山岩相(组)和所处对应碎屑岩成岩阶段的影响。距火山口越远的火山岩相组的火山岩储层,其孔隙度和渗透率越低。火山岩工业气层主要分布在晚成岩阶段A期以前的火山岩储层中。在晚成岩阶段B期,只有少量低产气层。本文充分考虑徐家围子断陷火山岩相和成岩作用对火山岩储层物性的影响与控制,应用成岩模拟软件,预测了成岩阶段的横向展布,通过叠合营三段火山岩相图和成岩阶段预测图,预测了火山岩储层的类型和质量,目前已发现工业气流的井主要分布在断陷中部的Ⅱ、Ⅲ类火山岩储层中。
The deep volcanic reservoirs in Xujiaweizi Fault Depression, Songliao Basin have the characteristics of deep burial, high temperature, high pressure, poor physical properties and high heterogeneity. In order to predict the variation of volcanic reservoir type and mass in the plane, the paper discusses the main geological factors that affect the physical properties of volcanic reservoirs. The results show that the physical properties of volcanic rocks are mainly affected by volcanic facies (group) and the corresponding clastic rock diagenetic stage. Volcanic reservoirs of volcanic facies farther from the crater have lower porosity and permeability. Volcanic industrial gases are mainly distributed in volcanic reservoirs before late A diagenetic stage. In late diagenetic stage B, there are only a few low-yield gas layers. In this paper, the influence and control of volcanic facies and diagenesis on physical properties of volcanic reservoirs are fully considered. Lateral distribution of diagenetic stage is predicted by diagenetic simulation software. Based on the volcanic lithofacies diagram and predictive map of diagenetic stage , Predicted the type and quality of volcanic reservoirs. It has been found that the wells of industrial gas flow are mainly distributed in the type Ⅱ and Ⅲ volcanic reservoirs in the middle of the fault depression.