伪井速度点宏观校正方法研究——以珠江口盆地M气田为例  

Macroscopic Correction Method of Pseudo-well Velocity Point——A Case Study of M Gas Field in Pearl River Mouth Basin

作　　者：罗泽 谢明英 涂志勇 魏启任 付敏杰 Luo Ze;Xie Mingying;Tu Zhiyong;Wei Qiren;Fu Minjie(Research Institute of Shenzhen Company,CNOOC,Shenzhen Guangdong 518000)

机构地区：[1]中海石油(中国)有限公司深圳分公司研究院

出　　处：《中外能源》2019年第11期22-28,共7页Sino-Global Energy

摘　　要：时深转换是将地震资料解释成果转化为地质成果的关键环节。鉴于珠江口盆地M气田具有复杂的断裂体系和沉积体系,传统变速成图等时深转换方法精度低、误差大。针对研究区分析了地震波速度的影响因素以及时深转换速度的求取思路,在实际工作中,通过对传统变速成图时深转换方法进行改进和优化,创新性地提出伪井速度点宏观校正时深转换方法。研究发现,变速成图等常规时深转换方法具有其局限性,无法满足油田开发阶段时深转换的高精度要求。伪井速度点宏观校正通过将纵向高分辨率的测井速度引入到地震速度,具体做法为通过层速度求取、平均速度求取、速度宏观趋势校正与实钻资料剩余误差校正等步骤,建立反映实际地质情况的时深转换关系,得到高精度构造图。实钻结果证实,伪井速度点宏观校正方法得到的构造图误差小,成图精度高。Time depth conversion is the key link of converting seismic data interpretation results into geological results;in view of the complex fault system and sedimentary system of M gas field in Pearl River Mouth Basin,the traditional time depth conversion method of variable speed mapping has low precision and large error.In this paper,the influence factors of seismic wave velocity and the way to calculate time depth conversion velocity are analyzed.In practical work,through the improvement and optimization of the traditional time depth conversion method of variable speed mapping, the time depth conversion method of macro correction of pseudo well velocity points is put forward innovatively.It is found that the conventional time depth conversion method such as variable speed mapping has its limitations and can not meet the needs of oil field In the development stage,the high-precision time-depth conversion is required.The macro correction of pseudo well velocity points introduces the vertical high-resolution logging velocity into the seismic velocity.The specific method is to establish the time-depth conversion relationship reflecting the actual geological situation and obtain the high-precision structural map through the steps of layer velocity calculation,average velocity calculation,macro velocity trend correction and residual error correction of real drilling data.The real drilling results show that the error of the structure map obtained by the macro correction method of pseudo well velocity point is small and the mapping accuracy is high.

关 键 词：时深转换 变速成图 高精度 伪井速度点 

分 类 号：P61[天文地球—矿床学]