碎屑岩成岩压实作用模拟实验研究  

Simulation Study on Clastic Rock Diagenetic Compaction

作　　者：刘国勇[1] 金之钧[2] 张刘平[3] 

机构地区：[1]石油大学盆地与油藏研究中心,北京102249 [2]教育部石油天然气成藏机理重点实验室 [3]中国科学院地质与地球物理研究所,北京100029

出　　处：《沉积学报》2006年第3期407-413,共7页Acta Sedimentologica Sinica

基　　金：中国石油天然气集团公司石油科技中青年创新基金项目(编号:2002-CX-3);国家重点基础研究发展规划"973"项目(2004CB720503)联合资助

摘　　要：实验采用自行设计和组装的压实成岩模拟装置,以中砂级纯净石英碎屑为实验介质,开展压实模拟实验,通过对实验过程中所出现的物理和化学变化进行分析和研究,得到了一些认识:在压实过程中,砂体孔隙度和渗透率的变化具有明显的二分性,即压实初期的陡变带和随后出现的缓变带;缓变带实验数据分析表明,孔隙度和承载压力之间存在良好的线性关系,孔隙度和渗透率之间存在良好的半对数关系,渗透率和承载压力之间存在良好的指数关系。系统流体的实时取样测试表明,压实作用不仅仅是一个物理过程,同时也会发生化学变化,即使在较浅的埋藏条件下,石英砂体也发生了压溶现象。A set of new equipment has been designed and applied to simulate the diagenetic compaction. Medium quartz sand is selected as material to carry out the experiment. In order to do further research, physical and chemical change have both been detected, and some new conclusion have been reached. During compaction, the porosity and permeability are not varied regularly, and it can be divided into to section, a sudden change section and a uniform change section. In the uniform change section, the porosity decreases with the increase of the pressure, and they have a linear relation. The permeability decreases with the increase of the pressure either, and they have an exponential relation. The porosity and permeability also have semi-logarithmic relation. The testing and analysis of solution manifest that compaction is not only a physical change, but also a chemical change, indicating that the dissolution may occurs even at the lower burial depth.

关 键 词：压实作用 承载压力 孔隙度 渗透率 压溶作用 

分 类 号：P588.2[天文地球—岩石学] TE122.2[天文地球—地质学]