【摘要】 随着四川盆地龙岗地区油气勘探程度的不断提高,精细预测下三叠统飞仙关组鲕粒滩优质储层已成为当务之急。为此,应用地质—地震综合预测技术开展了该区沉积微相的研究:①通过岩心观察、薄片鉴定、地震相分析等手段,将飞仙关组鲕粒滩细分为白云化鲕粒滩、弱白云化鲕粒滩和石灰岩鲕粒滩3种类型;②利用合成记录进行地震—地质综合标定,发现鲕粒滩储层具有"低频、低速、低波阻抗、强振幅、低连续性"的反射异常特征;③采用叠后振幅属性提取、叠后波阻抗反演、地震相识别等多种地震属性分析技术,进行了沉积微相的平面展布预测。综合解释结果认为,鲕粒滩体主要分布于台缘带,平面上不规则;白云化鲕粒滩的规模较大,在多种地震属性信息上均有强烈响应,是优质储层发育带。更多还原

【Abstract】 Accurate prediction of quality oolitic beach reservoirs in the Lower Triassic Feixianguan Formation has become an urgent issue along with the advancement of exploration in the Longgang area.The integrated seismic-geological prediction technique was used to study the sedimentary microfacies in this area.The oolitic beach reservoirs in the Feixianguan Formation are subdivided into dolomitized oolitic beach reservoirs,weak dolomitized oolitic beach reservoirs,and oolitic limestone beach reservoirs through core observation,microscopic observation of thin section and seismic faces analysis.Integrated seismic-geological calibration with synthetic seismic records reveals that the oolitic beach reservoirs are featured by abnormal reflectance signatures such as low frequency,low velocity,low acoustic impedance,strong amplitude,and poor continuity.The areal distribution of sedimentary microfacies is predicted by various seismic attribute analysis techniques such as post-stack amplitude Abstract,post-stack acoustic impedance reversion,and seismic facies recognition.The oolitic beach reservoirs are mainly distributed on the platform margin.The dolomitized oolitic beach reservoirs are large in scale and show strong responses in various seismic attributes,thus are quality reservoirs.更多还原