Luliang Thin Bottom Water Reservoir Low-amplitude Pattern Adjustment Mode Research

Hypertonic low-amplitude bottom water reservoir with thin layer in Cretaceous Hutubihe group of Luliang oilfield was found in2000, it was a special kind of bottom water reservoir which never found before in China. The structure of the reservoir is of Low amplitude (between3m and12m), with thin layer (about3m) and active bottom water, its mining effect is much worse than edge water reservoir. Conventional logging data in recent years illustrate that a lot of residual oil is still not flooded by injected water. Better understanding of the flooding patterns and distribution of remaining oil is needed, suitable adjustment was studied.The bottom water reservoir with thin layer is different with those ordinary bottom water reservoir and bottom water reservoir with mezzanine. There is no ready-made examples can be learned from on pattern adjustment. Made a fine reservoir geological model and a numerical simulation model by making full use of intensive wear layer wells and wells drilled between2008and2012, and well with conventional logging could be used to interpret flooding layer. Well dealt with the size and extending direction of thin mud and calcium Mezzanine, and the oil-water transition zone problems. Obtain a satisfied result of dynamic production history matching. While the flooding thickness of model value and the actual value match well. Accurately and reliably determine water flooding patterns and the law of distribution of remaining oil in thin layer bottom water reservoir. Ensure the reliability of the pattern adjustment study. First proposed a optimized adjustment pattern for thin layer bottom water reservoir. Laid the foundation for the subsequent improvement of flooding system, and enhancement of flooding effect and oil recovery.Intuitive and reliable research result approved by oilfield staff unanimously, laid a theoretical foundation for the study of adjustment pattern on thin layer bottom water reservoir, optimization of the adjustment method is of theoretical and practical significance. And also provide reference and experience for the similar reservoir.