摘要
本文简述了川东地区上二叠统长兴生物礁的地质特征及其储集性能,并详细介绍了生物礁的测井响应特点及从礁组合中划分储渗层段的依据。只要具有双侧向、自然伽玛以及声波、中子和密度测井中任何两种以上的孔隙度测井,正确地选取骨架参数和流体参数,则无论采用GLOBAL程序或CRA程序处理、求解矿物成分和孔隙度,都能取得较好的结果。除了储层参数计算而外,还介绍了常用的几种判别流体性质的方法。文章的另一部分介绍了借助于井与井间曲线的对比找出非构造因素所引起的地层局部增厚、披盖现象和沉积补偿等特征,以确定生物礁的存在,研究其发育规律。最后,分析了两个井下礁体实例,讨论了几个应注意的问题。
This paper describes briefly the geological features and storage chara-cteristics of the reef in Changxing Formation, Upper Permian in East Sic-huan Area, and introduces in detail the log responses to the reef, and thebases on which differentiation of storing and permeable zones from reefcombination is made. Mineral constituents and porosity can be determinedwith good results using either GLOBAL or CRA as long as DLL, GR andany two of the three logs, Sonic, Neutron and Density are available, andmatrix and fluid parameters are properly selected. In addition to the com-putation of reservoir parameters, this paper also introduces some commonlyused approaches to define fluid propertyies. The rest of the paper deals with defining local formation thickening,drape and depositional compensation caused by non-structural factors todetermine the presence of the reef and study the law in which it devolopsby means of well-to-well log correlation. Finally, two examples of down-使sole reef body are analyzed and several problems that should be considereddiscussed.
