基于统计岩石物理学的流体成分反演应用实例研究

Realization and Application of AVO Fluid Inversion Based on Statistical Petrophysics

珠江口盆地番禺流花天然气区的PY气田位于陆架陆坡转折带上,特殊的沉积环境导致该地区主要储层SB21.0砂岩含油气性结论复杂,常规的AVO技术在该地区的应用存在陷阱。将统计岩石物理学与AVO理论结合,得到流体成分反演理论。流体成分反演技术是AVO技术的延伸,是一种定量的AVO技术,其最终结果是直观的碳氢指示分布图。采用流体成分反演技术,对研究区SB21.0储层进行含油气性预测。研究结果表明:流体成分反演技术能较有效、准确地检测已上钻目标储层及验证未上钻目标储层的流体性质。该理论的深入应用将有助于指导番禺流花天然气区的进一步勘探。

PY gas field is at shelf break turing zone,and the special depositional environment leads to complicated T50 sand forecasting.The common AVO theory is not applicable in PY gas field.AVO fluid inversion（AFI） is a quantitative technique on the basis of statistical petrophysics and AVO theory,making carbon hydrogen probability graph.The predication of T50 gas sand using AFI suggest that the AFI theory can estimate the hydro of bored well and certified well validly and accurately.It can be believed that the applications of AFI will guide the additional exploration and improve success rates of gas exploration.