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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。
This paper studies the compaction of sand and mudstone in North China, including Dongying depression, Dagang area and Bohai sea area. According to the change of porosity and its relation with volume, the formula of thickness before rock compaction in any depth interval is derived. Based on the results of computer calculation, the compaction and drainage of the formation in this area are divided into four stages. The third stage is the process of drastic compaction of mudstone and draining a large quantity of mud again. The depth of the mudstone is between 2100 and 3200 meters , Which is consistent with the large number of oil-forming depths in North China, indicating the significance of drastic compaction drainage to oil and gas migration. In this paper, the change of peak throat of pore throat with depth and the variation of clay mineral with depth by X-ray diffraction are studied by means of mercury intrusion test. The characteristics of each stage of compaction and discharge are further explained and the hydrocarbon in North China is explained. Large-scale accumulation period to the reservoir.