砂岩侵入体系物理模拟实验

近十年来,从露头、地震、岩心和测井曲线等资料中识别出了越来越多的砂岩侵入体。这些砂岩侵入体对油气勘探和开发既有正面影响,也有负面影响,但由于其发育过程和分布的复杂性,使得对于其成因机制和形成过程探讨较少。笔者建立了一套模拟砂岩侵入体系的实验装置,并设计了完整的实验程序,以模拟砂岩侵入体的形成过程,并探索其形成机理。在此基础上,进行了5组实验,分析了顶层沉积物厚度和进水管结构对砂岩侵入体形成的影响。通过对实验结果进行冷冻、切片和照相,将砂岩侵入体的形成过程分为5个阶段,并借助软件对每次实验的模型进行了三维重构,以期为更好地分析砂岩侵入体系的形成机理提供实验基础。

Simulation experiment of sand injectites

More and more sand injectites have been identified from outcrops,seismic data,core observation and logging curves in the last decade. They exert great influence upon exploration and development of oil and gas, both positively and negatively. But because of their complex formation process and distribution,fewer studies has been focused on soft sediments deformations formation mechanisms. A set of laboratory simulation device is set up and a whole experimental procedure is designed to discuss their genetic mechanisms. On this basis,5 experiments considered the influence of two main variables on the structures formed during fluidization, i.e., the thickness of the overlying coarse sediment layer and the configuration of inlet pipes, are carried out. Each experiment result is freezed,sliced and been taken photos to reconstruct a 3D model. It is hoped to provide an experimental basis for the formation mechanism analysis on sand injectites.