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南海崖城13-1气田是由多个复杂断块型封闭边水气藏组成,区块间的相互动用和水侵使得传统的物质平衡法难以准确计算动储量。在对各区块间连通性分析的基础上,采用罐状水体模型与视压力形式的物质平衡通式相结合,建立了考虑水侵的多区隔板气藏物质平衡方程,实现了对各区块动储量、水体体积和区块间传导率的准确计算。与传统动储量评估方法对比表明:对于既有水侵又有气体传导的气藏,开发早期采用压降法计算的动储量比较符合生产实际;之后由于水侵和气体传导,压降法计算的动储量偏大,采用仅考虑传导的多区隔板物质平衡法推算的动储量明显高于真实动储量,其原因一是忽略水体而导致其弹性能量被赋予在了气体上,二是将未钻井补给区块的气体和水体能量赋予在了已开发区块上。本文研究结果对于同类气藏不同开发阶段动储量评价具有借鉴意义。
The 13-1 gas field in Yacheng, South China Sea consists of a number of complex fault block type closed-side gas reservoirs. The interaction between the blocks and the water intrusion make it difficult to accurately calculate the reserves by the traditional material balance method. Based on the analysis of inter-block connectivity, the material balance equation of multi-zone partition gas reservoirs considering water intrusion is established by using the cantilever water body model combined with the material balance equation of apparent pressure form, Accurate calculation of reserves, volume of water and conductivity between blocks. Compared with the traditional method of estimating reserves, it shows that for the gas reservoirs with both water inrush and gas conduction, the reserves calculated by the pressure drop method in the early stage of development are more in line with the actual production; afterwards, due to water intrusion and gas conduction and pressure drop method The reason is that ignoring the water body and causing its elastic energy to be given to the gas, and the second is that it will not The gas and water energy of the drilling recharge block is given to the developed block. The results of this paper can be used as reference for the evaluation of dynamic reserves in different development stages of similar gas reservoirs.