建南地区须六段致密砂岩优质储层预测技术
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摘要
建南地区须家河组须六段为典型的致密砂岩气藏,具有全区富砂、整体含气及局部富集的特征,是岩性气藏勘探的有利地区。该区须六段致密砂岩物性差、厚度薄,砂岩与泥岩波阻抗值接近,应用叠后波阻抗反演等技术难以识别储层。通过技术攻关,建立了致密砂岩优质储层预测技术。该技术主要包括3个步骤:1从井出发,总结典型地质体的地震相模式,利用地震属性分析技术对致密砂岩储层有利发育区进行宏观预测;2利用岩石物理建模及分析技术,分析不同岩石的物理性质,如纵波阻抗与泊松比等的变化,确定识别岩性的敏感参数和方法;3综合运用多参数反演与叠前反演技术,有效识别优质储层。研究结果表明:该技术在建南地区须六段致密砂岩优质储层预测中取得了较好的效果,具有一定的推广应用价值。
The tight gas reservoir of the sixth member of Xujiahe Formation which is characterized by sandstone-rich,gas-bearing in whole and local enrichment is favorable area for exploration. The sixth member of Xujiahe Formation is chara-cterized by poor physical properties and relatively thin thickness, which gives birth to similar wave impedance of sandstone reservoirs and mudstones. Thus, it is difficult to use post-stack wave impedance inversion to distinguish reservoir. Prediction technique of high-quality reservoir in tight reservoir has been established by technical research.It includes three steps: firstly, seismic facie models of typical geologic bodies should be summarized from logging information and the macroscopic favorable zones ought to be forecasted by analyzing seismic attributes; secondly,physical properties of different types of rocks such as impedance, Poisson's ratio and so on are supposed to be analyzed by rock physics modeling, in which the sensitive lithology parameters can be picked out; thirdly, favorable reservoir is able to identified effectively by comprehensive application of multi-parameter inversion and pre-stack inversion. The application of this technique in the sixth member of Xujiahe Formation in the study area proved to have good result and have great application prospects.
引文
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