拟声波反演技术在储层预测中的应用——以吐哈盆地台北凹陷胜北地区白垩系为例

APPLICATION OF QUASI-ACOUSTIC INVERSION TECHNOLOGY TO RESERVOIR PREDICTION—A CASE STUDY OF THE CRETACEOUS IN SHENGBEI AREA OF THE TAIBEI SAG, THE TUHA BASIN

王玉学 汤达祯 龚建华 朱有信 纪艳红

WANG Yu-xue TANG Da-zhen GONG Jian-hua ZHU You-xin LI Zhi-jun

中国地质大学, 北京 100083 2. 吐哈油田 石油地质研究院, 新疆哈密 839009

China University of Geosciences, Beijing 100083, China 2. Research Institute of Petroleum Geology, Tuha Oilfield, Hami, Xinjiang 839009, China

岩性油气藏勘探开发的关键是储层定量预测,而地震反演是进行储层定量预测的核心技术,其难点在于薄层分辨、岩性识别等。拟声波反演技术是根据能够反映储层特征的非声波储层地球物理测井信息构建的具有声波量纲的新曲线进行储层预测反演的,它是解决岩性油气藏勘探的一种有效手段。吐哈盆地台北凹陷胜北地区白垩系地层砂、泥岩声波速度差异小,声波时差曲线对砂、泥岩的岩性反映不明显,储层预测难度大。作者使用与岩性相关性好的自然电位曲线(SP)构建拟声波曲线进行储层预测并取得了明显效果,落实了该区白垩系油层的分布范围,达到了油藏精细描述的目的,为该区下步勘探开发部署提供了决策依据。

Reservoir quantitative prediction is the key technology of lithologic reservoir prospecting,and seismic inversion is the most important core technique of it.For it,thin layer differentiation,lithologic character recognition and reservoir identification are the most difficult problems.Quasi-acoustilogging-restrained seismic inversion technology is using the reservoir geophysical characters to construct acoustic waves from other logging curves in order to inverse the parameters of reservoirs.The difference between sandstone velocity and mudstone velocity is too weak to predict reservoirs.The quasi-acoustilogging-restrained seismic inversion has been constructed here and got ideal effects in identifying reservoir distribution and thickness.It was indicated that the prediction results were accurate,and this method can be used in the further exploration of the study area.

https://doi.org/10.11781/sysydz200403303