第25卷第6期 2011年12月
现代地质 GEOSCIENCE
VoL 25
No.6 Dee. 2011
砂岩机械压实与物性演化成岩模拟实验初探
操应长，蕙克来，王健，远光辉，杨
田
（中国石油大学地球科学学院，山东青岛266555）
摘要：为了模拟沉积地层埋藏成岩过程中，压实作用下储层物性参数的连续变化特征，采用自行设计的成岩作用模拟实验系统，利用不同的现代沉积物样品，开展了砂岩机械压实作用模拟实验。实验表明：砂岩机械压实作用过程中孔隙度和渗透率随深度的变化具有分段性，即早期速变阶段和晚期缓变阶段。利用缓变阶段的数据分析发现，深度与孔隙度之间存在着良好的指数关系，深度与渗透率之间存在着良好的乘罪关系，孔踪度与渗透率之间存在着良好的指数关系。只经历机械压实作用的情况下，相同物源、相同分选的砂岩，颗粒粒度越粗，压实作用过程中，压实减孔率越小，最终保存的孔隙越多，砂岩渗透性越好；不同分选、相近粒度的砂岩，分选越差，压实作用过程中，压实减孔率越大，最终保存的孔隙越少，砂岩渗透性越差。不同岩相类型的砂岩，在压实缓变阶段，分选好中砂岩相平均百米减孔量最小，其次为分选好细砂岩相和分选好粉砂岩相，再次为分选中等粗砂岩相，分选差含砂砾岩相平均百米减孔量最大。
关键词：孔欧度；渗透率；机械压实；成岩模拟
中图分类号：TE122.2
文献标志码：A
文章编号：10008527(2011)06-115207
PreliminaryDiscussion ofSimulationExperiments onthe Mechanical
CompactionandPhysicalPropertyEvolutionofSandstones
CAO Ying-chang,XI Ke-lai,WANG Jian,YUAN Guang-hui,YANG Tian(School of Geosciences, China Unitersity of Perroleum, Qingdao, Shandong266555, China)
Abstract: In order to simulate the physical property change of sedimentary strata in the diagenetic process, a set of new equipment was designed and applied to simulate the mechanical compaction using different moderm sediments. Results of the experiments show that the porosity and permeability are not regularly changing during compaction, and it can be divided into two sections, i. e. a sudden change section at early stage and a uniform change section at later stage. In the uniform change section, the porosity decreases with the increase of the depth, and they have an exponential relationship; the permeability also decreases with the increase of the depth, and they have an exponentiational relationship; the porosity and permeability also have an exponential relationship. When the sandstone only experiences mechanical compaction, for the sediments with same source and separation, the more coarse of grain size is, the slower of compaction rate is, and the porosity and permea-bility will be larger; for the sediments with the similar source and grain size, the poorer sorting is, the quicker compaction rate is, and the porosity and permeability will be less. During the uniform change section, the po rosity reduction per 100 meters is also different for different lithofacies in sandstones. The porosity reduction per 100 meters is the least in well sorted medium sandstone, followed by that in well sorted fine sandstone and well
收稿日期：2011-10-10；改回日期：2011-11-20；责任编辑：潘令枝。
基金项目：国家自然科学基金项日（40972080）；国家科技重大专项项目（2011ZX05009-003）；教育部新世纪优秀人才支持计划项
耳(NCET 06 0604)。
作者简介：操应长，男，教授，博土生导师，1969年出生，沉积学、层序地层学及油气储层地质学专业，主要从事沉积学、层序
地层学及油气储层地质学的教学和科研工作。Email；cye8391680@163.com。
通信作者：尊克来，男，碳士研究生，1988年出生，油气储层地质学，主要从事沉积学及油气储层地质学的研充工作。
Email;kelai06016202@126.com。