Abstract: This is a study of compaction of sand and mud stones in North China, including Dongying, Dagang and Bohai Sea Based on the variations of porosity of the rock and their relationship to the volume of rock, equations for the thickness of rocks at any depth intervals before compaction are derived. According to the results of electronic computer's computation, the process of compaction of and squeezing out of water from the rocks is divided into four stages, with rapid compaction of mud stones and further expulsion of large amount of water occurring during the 3rd stage at 2, 100-3,200 meters depth. This agrees with the depth of oil occurrence in North China, indicative of the significance of this stage to oil and gas migration. Mercury injection tests have been carried out to study the changes of peak values of pore throats with increasing depth, while the data obtained from x-ray diffraction analysis have been used to study the changes of clay minerals with increasing depth with a view to illustrate further the character of compaction and water expulsion in different stages. The elastic effect of rocks, the time of large scale accumulation of oil and gas into the reservoir rooks.

摘要： 本文研究了华北地区(包括东营凹陷,大港地区和渤海海域)的砂、泥岩的压实作用。根据孔隙度的变化及其与体积的关系,推导出任一深度间隔内岩石压实前的厚度值的公式。并以电子计算机计算结果,将该区地层的压实和排液情况划分出四个阶段,提出第三阶段是泥岩急剧压实并再次大量排液的过程,其所处深度为2100～3200米,和华北地区大量成油深度相一致,表明急剧压实排液阶段对油、气运移的重要意义。文中以压汞试验,研究了孔隙喉道峰值随深度的变化以及X-衍射分析所得的粘土矿物随深度变化的资料,进一步说明压实和排液的各阶段特征,并解释了华北地区的油气大规模向储集层聚集的时期。