一种新的构建GS曲线砂岩储层地震预测的方法
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摘要
目前描述砂岩储层主要是基于测井约束反演的方法,而实际应用中由于地下地质条件的复杂程度导致了测井声波不能较好的识别砂岩,即储层与围岩的速度相当,利用这种测井声波进行约束反演时,获得的声波阻抗难于识别砂岩储层的分布,预测结果存在着较大的误差;当地层不含泥质以外的放射性物质时,自然伽玛能够较好的识别砂岩,本文提出利用改造的Z-score法结合自然伽玛重新刻度的声波曲线GS(Gamma Sonicwave简称GS曲线)可以较好的识别砂岩。实际应用表明,用GS曲线做约束反演,反演结果可以较为准确的预测砂岩储层。
Currently the description of sandstone reservoir is mainly based on the method of logging constrained inversion,and due to the complexity of underground geological conditions,sonic waves of logging can not distinguish from sandstone better in practical applications.In other words,the velocities of the reservoirs are the same as surrounding rock's velocities,and when we use the sonic waves of logging to do the work of constrained inversion,obtaining the sonic waves impedance is more difficult than identifying the distribution of the sandstone reservoirs,and the predicted result is a greater error;Natural gamma can distinguish from sandstone very good when there are not the radioactive materials in the strata in addition to mudstone.This paper is using the reconstructive method of Z-score to combine with gamma ray to redesign gamma sonic wave(GS),GS curve can better distinguish from sandstone.In practical applications,the result of constrained inversion with GS curve shows better.
Currently the description of sandstone reservoir is mainly based on the method of logging constrained inversion,and due to the complexity of underground geological conditions,sonic waves of logging can not distinguish from sandstone better in practical applications.In other words,the velocities of the reservoirs are the same as surrounding rock's velocities,and when we use the sonic waves of logging to do the work of constrained inversion,obtaining the sonic waves impedance is more difficult than identifying the distribution of the sandstone reservoirs,and the predicted result is a greater error;Natural gamma can distinguish from sandstone very good when there are not the radioactive materials in the strata in addition to mudstone.This paper is using the reconstructive method of Z-score to combine with gamma ray to redesign gamma sonic wave(GS),GS curve can better distinguish from sandstone.In practical applications,the result of constrained inversion with GS curve shows better.
引文
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[2]朱东亚,胡文?,曹学伟,等.临南油田隔层类型划分及其分布规律研究[J].地球科学—中国地质大学学报,2004,29(2):211～219.
[3]谭秀成,李凌,曹剑,等.库车坳陷东部下第三系碎屑岩储层分异成因模式[J].地球科学—中国地质大学学报,2007,32(1):199～204.
[4]胡元现,M Chan,S Bharatha,等.西加拿大盆地油砂储层中的泥岩夹层特征[J].地球科学—中国地质大学学报,2004,29(5):550～554.
[5]John Delaughter,Bob Meltz,Stacy Smith,等.2005.用Z-score法重新刻度振幅[J].前沿,24(7):698～701.
[6]崔健,张星.曲线重构反演在储层预测研究中的应用[J].大庆石油地质与开发,2008,27(3):133～135.
[7]陈钢花,王永刚.Faust公式在声波曲线重构中的应用[J].勘探地球物理进展,2005,28(2):125～129.
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