Calculation of key reserve parameters of fluvial reservoirs in Bohai oilfiled Wang Haigeng, Tian Xiaoping, Cui Yunjiang, Guo Tieen, Wang Shaopeng,Huang Jianting, Sun Fengtao

doi:10.11743/ogg20110218

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Calculation of key reserve parameters of fluvial reservoirs in Bohai oilfiled Wang Haigeng, Tian Xiaoping, Cui Yunjiang, Guo Tieen, Wang Shaopeng,Huang Jianting, Sun Fengtao
Vol. 32, Issue 2, Pages: 287-292(2011)
Online First：28 April 2011，

Published：2011
DOI： 10.11743/ogg20110218
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DOI：

Calculation of key reserve parameters of fluvial reservoirs in Bohai oilfiled Wang Haigeng, Tian Xiaoping, Cui Yunjiang, Guo Tieen, Wang Shaopeng,Huang Jianting, Sun Fengtao[J]. 2011, 32(2): 287-292. DOI： 10.11743/ogg20110218.

摘要

含油气面积和有效厚度是渤海油田河流相油气藏储量计算的关键参数，利用海上油田高品质地震资料，应用测井约束反演技术开展砂体，尤其是含油气砂体的空间展布研究，砂体分布范围及厚度的预测准确率在80%以上，准确把握了砂体的含油气范围及油气层厚度；采用油田丰富的压力资料，预测河流相油气藏的流体界面，在压力资料品质及储层条件较好的情况下，预测的流体界面十分接近实测的流体界面，有效提高了储量计算过程中含油气面积圈定的准确性；充分利用壁心、测压资料开展有效厚度下限研究，采用自然电位异常幅度相对值与微侧向电阻率相对值的比值（ΔSP/ΔRxo）来识别低阻油层，经测试及生产资料证实，识别低阻油层的准确率达100%，确保了储量计算过程中有效厚度确定的准确性。

Abstract

Oil/gasbearing area and net pay thickness are the two key parameters for reserve calculation of fluvial sandstone reservoirs in Bohai oilfield. Quality seismic data and logconstrained seismic inversion technology were used to predict the area and thickness of oil/gasbearing sandbodies with accuracy over 80%. The abundant formation pressure data available were used to predict oil/gaswater contacts. The prediction results coincide well with the measured data

effectively enhance the accuracy of oil/gasbearing area for reserve calculation. Sidewall core data and formation pressure data were used to determine the lower limit of net pay thickness. The ΔSP/ΔRxo was used to identify low resistivity oil layers and the accuracy is up to 100%.