锦66井区盒2段气水分布规律及开发对策研究

Gas-water distribution regularity and development strategies of He-2 member in Jin66 well block of Dongsheng gas field

东胜气田锦66井区属于低孔、低渗、低丰度的岩性构造气藏,部分井产水量大,制约了产能的进一步提升,目的层盒2段气水分布规律及控制因素不明,气水分布复杂。根据气田钻井、测试等资料建立了气水识别电性标准,通过全区标准化气水识别和已有的成藏认识,认为气层、水层为非区域性的连续分布,气水界面不统一,构造高、物性好,则气层相对发育,为典型的岩性构造气藏。通过分析认为产水主要来源于盒2段层内水,同时本区地层水可分为孤立透镜体水、边底水及弱分异的气水混层。气水分布受构造特征、优质储层分布、储层非均质性和油气成藏等因素的控制,据此提出了对应的开发地质对策。

Jin66 well block in Dongsheng gas field belongs to a lithology-structural reservoir with low porosity, low permeability and low abundance. Water production of some wells is large, which restricts the further improvement of productivity. The gas-water distribution regularity and controlling factors of target formation He-2 member are unclear, and the gas-water distribution is complex. Based on the drilling data and testing data of gas field, the electrical standard for gas-water identification was established. Through standardized gas-water identification and existing reservoir-forming understandings in the whole region, it is considered that the gas-water layers are non-regional continuous distribution, the gas-water interface is not uniform, the structure is high, the physical properties are good and the gas layers are relatively developed, which is a typical lithologic structural gas reservoir. The analysis shows that the water production mainly comes from the water in He-2 member, and the formation water in this area can be divided into isolated lens water layer, gas-water mixed layer with edge bottom water and weak differentiation. The gas-water distribution is controlled by structural characteristics, high-quality reservoir distribution, reservoir heterogeneity and reservoir formation, and then the corresponding geological development strategies were put forward.