胡154区长4 + 5油层组水淹层解释方法研究

The Interpretation Method of Water Flooded Layer in Chang 4 + 5 Reservoirs in Block Hu 154

摘要: 注水开发是提高岩性油气层采收率的一种有效方法, 后期井网加密调整更是为了动用剩余油，进一步提高油藏采收率的有效方法。但由于长期的注水开发，部分储层已经水淹或者严重水淹，由于注入水进入地层，导致地层水矿化度变得复杂，不同水淹层测井曲线形态呈现多样性，解释难度非常大。经过对胡154区长4 + 5油层组水淹层特征研究，总结出3种水淹层解释方法：新老井电阻率对比法、测井曲线形态法、电阻率曲线重构法。2017年通过3种方法综合应用，胡154区长4 + 5油层组加密调整井解释符合率达92.2%，取得了较好的应用效果。

Abstract: Water injection development was an effective method for enhancing the recovery of lithologic oil and gas reservoirs, the subsequent well pattern infill and adjustment were the effective method for producing remaining oil and further enhancing oil recovery in the reservoir. However, due to long-term water injection, some reservoirs were flooded or severely flooded. Because of the injected water entering into the formation, the salinity of formation water was complicated, and the morphology of logging curves of different water flooded strata was diverse, which induced the more difficulties in logging interpretation. By studying the characteristics of water-flooded layer of Chang 4 + 5 Reservoirs in Block Hu 154, three kinds of water-flooded layer interpretation methods are summarized, including the new-old well contrast method, the curve morphology method and the resistivity reconstruction method. The better application results are obtained by comprehensive application of the three methods, the interpretation coincidence rate of infill and adjustment well is 92.2%.