鄂尔多斯盆地SX地区PP+PS波地震流体检测技术

PP and PS Wave Seismic Fluid Detection Techniques in SX Area of Ordos Basin

鄂尔多斯盆地是典型的低孔、低渗、低压岩性油气藏,地震预测有效储层难度大,同时SX地区天然气储层特殊的地质条件导致PP波地震资料在有效储层的识别上存在多解性。开展多波地震勘探以获取不受流体影响的横波信息,利用PP+PS波联合解释含气层,尽量规避单纯利用PP波资料的多解性,是解决SX地区地震流体检测问题的新途径。故基于SX地区测井资料岩石物理分析的基础上,主要阐述PP+PS波地震流体检测技术系列,包括PP+PS波"亮点"特征分析技术、PP+PS波振幅比技术、PP+PS波AVO分析技术与PP+PS波匹配压缩对比分析技术等。本技术系列在SX地区取得广泛应用,减少了PP波检测流体的多解性,提高了地震检测流体的能力和预测钻井成功率。

Ordos Basin is characterized by typical lithologic hydrocarbon reservoir with low porosity,low permeability and low pressure.And it is difficult to predict effective reservoirs by seismic techniques.Besides,the special geological conditions of natural gas reservoirs in SX area lead to ambiguity in effective reservoirs prediction by PP wave seismic data.So a new approach solving the problem of seismic fluid detection must be studied in SX area.Here the solution is multi-wave seismic exploration obtaining S wave information which is not affected by the fluid effects.Then we can interpret gas-bearing layer using PP and PS waves,as far as possible to circumvent the PP wave data ambiguity.Based on rock physical analysis of logging data,we mainly expound the PP and PS wave seismic fluid detection techniques,including PP and PS wave＂bright spot＂characteristic analytical technique,PP and PS wave amplitude ratio technique,PP and PS wave AVO analytical technique and PP and PS wave compression contrast technique.These techniques have been widely applied in SX area,reducing the ambiguity of PP wave fluid detection technique,improving the ability of seismic fluid detection and drilling success rate.