二连油田沉凝灰岩储层特征分析

二连油田某地区有一套沉凝灰岩储层,该储层具有与正常的沉积岩、火山碎屑岩不同的测井响应特征,即高中子、低密度、声波时差无反应.针对沉凝灰岩的测井响应值,并结合岩心分析资料对沉凝灰岩储层的形成、孔隙结构特征、储层物性特征等方面进行了分析,研究了沉凝灰岩储层典型的测井响应特征的形成机理,并采用岩心刻度测井技术建立了判断岩性和孔隙度的三孔隙度频率交会图版,在实际应用中见到了一定的效果.

Analysis of the Characteristics of Tuffite Reservoir in Erlian Oilfield

There is a layer of tuffite reservoir in Erlian oilfield. The log responses of this tuffite reservoir are different from those of normal sedimentary rock and pyroclastic rock. The characteristics of the log responses are high neutron, small bulk-density and no presence of acustic-travel-time. Based on lab-based core data, analysed are the genesis of tuffite reservoir formed, pore structure features and physical properties for interpreting those response characteristics. The log responses of tuffite reservoir in B structure in Erlian oilfield are given. Combination of core calibration technique, conventional log and testing data are used to establish three-porosity crossplot charts and interpretation criterion for lithology identification and porosity estimation.