基于伪速度模型的三维地质模型快速构建方法
2021-07-23肖大志周展曾晓华董德喜
肖大志 周展 曾晓华 董德喜



摘要:在储量计算、油气田开发方案研究、正演模拟、油气藏渗流机理研究中,构造不确定性是一个重要的影响因素。为评价构造不确定性影响,常规方法需要分步建立不同构造条件下的三维地质模型,且难以保证不同模型间地质参数分布一致性。采用新方法,只要先建立基础模型,再通过基础模型的构造层面与相应条件下构造层面建立相应虚拟速度模型,即可实现基础模型在特定条件下地质模型的快速转换,同时实现基础模型和特定模型间地质参数分布的一致性,并有较好的推广应用价值。
关键词:地质模型;构造不确定性;伪速度模型<!-- 不少于4个,英文一致-->;时深转换;
Rapid Construction of Three-Dimensional Geological Models Based on Pseudo- Velocity Modeling
XIAO Dazhi ZHOU Zhan ZENG Xiaohua DONG Dexi
(Zhanjiang Branch of CNOOC, Zhanjiang, Guangdong Province, 524057 China<!-- 依次为单位,市,省,邮政编码中国(ShangqiuPolytechnic, Shangqiu, He'nanProvince, 476000China) -->)
Abstract: Structural uncertainty is an important factor in reserve calculation, research on oil-gas field development plan, forward modeling and reservoir flow mechanism study. In order to estimate the influence of structural uncertainty, conventional methods need to establish three-dimensional geological models under different tectonic conditions step by step, and it is difficult to ensure the consistency of geological parameters distribution among different models. Using the new method, as long as the basic model is established first, and then the corresponding pseudo velocity model is established through the structural layer of the basic model and the corresponding structural layer under the corresponding conditions, the fast conversion from the basic model to the geological model under the specific conditions can be realized, and the consistency of the distribution of geological parameters between the basic model and the specific model can be realized, which has a good application value.
Key Words: 3D geological modeling; Structural uncertainty; Pseudo-velocity modeling<!-- 和中文一致-->; Time depth conversion
0引言
构造因素是储量计算、油气藏前期方案研究、正演模拟、油气藏渗流机理研究中需要考虑的一个重要因素。在储量计算和开发方案研究方面,构造因素不仅影响地质储量大小,同时影响开发方式和开发方案选择[1-2];在正演模拟研究方面,构造倾角是影响地震响应特征重要因素[3-5];在滲流机理和开发效果评价研究方面,构造对底水油气藏底水推进,水驱、注气驱油藏开发效果有重要影响[6-11];同时在CO2地质封存方面,对CO2封存效率和安全性影响显著[12]。
常规的基于不同构造特征建立地质模型的方法,一般需要分不同构造建立多套地质模型进行模拟对比或正演比较。对于简单地质模型,参数分布较为简单,常规分布建立不同构造条件下的地质模型相对简单,仅是重复相同步骤即可,虽影响效率但实现难度不大。……
