油藏评价阶段造成探明储量计算偏差的主要因素分析

Analysis on calculation errors of reserve estimation during the reservoir evaluation stage

针对胜利油区油藏评价阶段探明储量计算出现偏差的区块(单元),对比储量复算前后各项储量参数的变化,分析各项储量参数变化对储量变化影响的大小,确定造成储量偏差的首要参数,进一步分析造成该参数发生偏差的主要影响因素,确定了造成油藏评价阶段探明储量计算偏差的4项主要因素,即油藏认识、地震资料、井控程度和试油(采)资料。选取4个典型油藏,对造成油藏评价阶段探明储量计算偏差的主要因素分别进行了进一步的解剖分析,对今后探明储量计算中避免类似问题的发生具有很好的借鉴意义。

In response to the blocks and units with errors of reserve estimation on the proved reserve during the reservoir evaluation stage of Shengli oilfield,the reserve parameters before and after reserve revision are compared to analyze the influence of variation of reserve parameters on the reserve estimation so as to ascertain the major parameters responsible for the reserve estimation errors,and then the main factors causing the errors are further analyzed.It is ascertained that,there are four factors causing the errors of reserve estimation,that is,the understanding on reservoir,seismic data,well controlling status,and lest data.Moreover,four typical reservoirs are selected to verify the validity of the four factors proposed above,and offering instructive reference on how to avoid analogous problems during the proved reserve estimation in the future.