【摘要】 阿姆河右岸麦捷让地区碳酸盐岩气藏非均质性强,储层横向厚度变化大,前期研究多结合地震波场模拟进行储层预测,气藏流体检测工作较少,新钻井情况表明内部流体关系复杂,需要开展流体检测工作对气藏内部流体分布进行全面认识.本文从岩石物理模型入手,分析石灰岩纵横波速度、弹性参数与岩石基本性质之间的定量关系,寻找对流体敏感的弹性属性,认为纵横波速度比能较好地识别气水分布.通过测井弹性参数交会和流体替换,以实际资料验证岩石物理分析结果并选择气藏敏感参数,建立了适合本地区的气藏预测模版.利用叠前时间偏移得到的共反射点道集,开展三维叠前同时反演,利用反演结果进行了储层流体识别.预测结果与验证井吻合良好,且含气分布范围揭示了两个气藏存在.更多还原

【Abstract】 The gas reservoirs in the Metajan district in right bank block of Amu Darya river are constructed with strongly heterogeneous carbonates.The thickness of gas reservoirs varies significantly horizontally.In former studies,seismic wave field simulation is mostly used to help predicting reservoirs,while the work of the direct fluid detection has not been realized.By analyzing the test result of wells,it can be known that the relationship between gas and brine is very complicated.The fluid-detection work is important for evaluating the distribution of fluids in the gas reservoir.This paper performs rock physics modeling and deduces the quantitative relations between P-and S-wave velocities,elastic coefficients and the basic properties of rocks.We analyzed the relations using cross-plots and found that the P and S-wave velocity ratio is an effective parameter to identify the gas and brine.By analyzing the elastic parameter cross-plot of log data and performing fluid substitution,the rock physics models are verified.Several parameters are sorted out,which are most sensitive to gas.Rock physics template is designed consequently.Using the Pre-stack time migration CRP gather we carried out the 3D pre-stack stimulation inversion.Based on the results of pre-stack inversions,the approach is applied to detect fluid in reservoirs.The estimated results are in good agreement with the testing well.The areas of gas distribution have revealed that two sets of gas reservoirs are distributed.更多还原