利用地球物理综合预测方法识别页岩气储层甜点——以四川盆地长宁区块下志留统龙马溪组为例

发布时间：2018-03-28 00:13

  本文选题：页岩气　切入点：甜点预测　出处：《天然气工业》2017年05期

【摘要】：四川盆地长宁区块是中国最早进行页岩气勘探开发的地区,但以往地震工作量投入相对较少,尚未精细刻画出页岩气商业开采的"甜点区"。为此,基于测井及三维地震解释成果等资料,通过地震岩石物理分析和建模,确定页岩气储层甜点地球物理响应特征,并以此为依据,应用全道集叠前反演技术预测了总有机碳含量(TOC)、优质储层厚度、地层脆性及地层压力等关键评价参数的平面分布情况;应用模糊优化综合评价方法确定了甜点的空间展布。研究结果表明:(1)该区页岩气储层甜点具有明显的低密度、低纵波速度、低泊松比、低纵横波速度比特征,且TOC越高,上述特征越明显;(2)优质页岩储层(Ⅰ、Ⅱ类区)在纵向上主要分布于下志留统龙马溪组底界上部约30 m范围内,平面上主要分布于三维地震区块的中部,建议优先开发;(3)Ⅲ类储层区各项关键评价指标均较低,建议选择性开发。
[Abstract]:The Changning block of Sichuan Basin is the first area in China to carry out shale gas exploration and development, but in the past, the amount of earthquake work was relatively small, and the "dessert area" for commercial shale gas exploitation has not yet been carefully delineated. For this reason, Based on the data of logging and 3D seismic interpretation, the geophysical response characteristics of shale gas reservoir are determined by seismic rock physical analysis and modeling. The plane distribution of the key evaluation parameters, such as total organic carbon content (TOC), high quality reservoir thickness, formation brittleness and formation pressure, is predicted by using the prestack inversion technique of whole trace gathering. The spatial distribution of desserts is determined by using fuzzy optimization comprehensive evaluation method. The results show that the desserts of shale gas reservoirs in this area have obvious characteristics of low density, low P wave velocity, low Poisson ratio, low P / S wave velocity ratio, and the TOC is higher. The more obvious the above characteristics are, the more obvious is the high quality shale reservoir (鈪，

本文编号：1673885