井—震标定参数分析及薄层标定——以塔里木盆地哈得四油田为例  

Analysis of Well-to-Seismic Calibration Parameters and Thin Reservoir Calibration: A Case Study of HD4 Oilfield in the Tarim Basin

作　　者：王晓平[1] 王训练[1] 凌云 张红梅 吴琳 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]东方地球物理公司研究院,河北涿州072751

出　　处：《现代地质》2005年第2期295-302,共8页Geoscience

基　　金：中国石油集团公司塔里木油田分公司项目 (41004050012)。

摘　　要：新疆塔里木盆地哈得四(HD4) 油田的主要储层东河砂岩属于薄储层, 其厚度小于1 /4地震波长, 根据地震数据难以分辨储层的顶界和底界。为了利用声波速度对薄储层进行有效的井—震标定, 从井—震标定的原理出发, 以哈得四油田的井—震标定为例, 分析了标定过程中子波的主频、类型和相位及声波速度对合成地震道的影响, 同时分析了声波速度与叠加速度转换的层速度之间的差别。提出以参考层为标准, 并对声波速度进行微调的薄储层的标定方法。参考层在研究区是一套沉积环境相对稳定、厚度较大的地层, 它对应于地震剖面上的一个振幅较强、反射轴连续并易于追踪的反射界面。利用上述方法, 以哈得四油田二叠系火成岩及石炭系双峰灰岩为参考层, 选取与研究区地震数据吻合性最好的子波,合理地调整声波速度, 对哈得四油田的主要储层东河砂岩进行井—震标定, 获得了较为理想的效果。Donghe sandstone, the main reservoir of HD4 oilfield in the Tarim Basin, is the thin reservoir whose thickness is less than 1/4 seismic wavelength; therefore the top and bottom of the reservoir cannot be identified through seismic data In order to calibrate properly the thin reservoir of HD4 oilfield with acoustic velocity, based on the theory of well to seismic calibration, the influence of the dominant frequency, kind and phase of the wavelet, and acoustic velocity on the synthetic traces was analyzed, moreover, the differences between interval velocity from stacking velocity and acoustic velocity were discussed. A new method using reference layer and adjusting acoustic velocity for calibrating thin reservoir was proposed. A reference layer is the thick stratum with stable sedimentary environment, and it corresponds to a high amplitude and continuous reflector to be easily traceable in the seismic section. The results of well to seismic calibration are effective by selecting Permian igneous rock and Carboniferous double peak limestone as the reference layers, adjusting appropriately acoustic velocity and choosing the most suitable wavelet

关 键 词：薄层 井-震标定 子波 叠加速度 声波速度 参考层 塔里木盆地 

分 类 号：P631.4[天文地球—地质矿产勘探]