摘要
以砂泥互层正常压实模型为基础。提出一种新的地层骨架密度计算公式。与现行的计算公式相比，新的计算公式符合骨架体积、骨架质量不变原理，已知现今地层的孔隙度－ 深度、密度－ 深度函数，便可计算基底之上某一厚度的地层骨架密度，并且可以替代压实前的相应的古地层骨架密度，参与构造沉降量所必须的地层古平均密度的计算。现行的地层骨架密度公式仅仅考虑含砂率对地层骨架密度的影响。新的计算公式则综合了含砂率、总的砂岩平均孔隙度、总的泥岩平均孔隙度３ 个重要因素，它们对地层骨架密度的影响，直接反映在地层平均密度、平均孔隙度的变化上，即地层骨架密度最终由地层平均密度和平均孔隙度所决定。
Based on the compaction model of sandstone mudstone alternating beds, we advance a new formula for formation grain density, which conforms to grain volume and mass balance law. Based on the porosity depth function and the density depth function, we can use the new formula to calculate the grain density of formation upon the basement. The calculating result can be used to replace the paleo formation grain density to calculate the paleo formation average density ( ρ s) which is very important to tectonic subsidence. The traditional formula indicated that sandstone percent is the only affecting factor to the formation grain density. The new formula hints that formation grain density is affected by sandstone percent, average sandstone porosity and average mudstone porosity. Further, the decisive factors to the formation grain density are average density and average porosity of the formation.
出处
《石油实验地质》
CAS
CSCD
北大核心
1999年第4期369-371,319,共4页
Petroleum Geology & Experiment
基金
国家自然科学基金
国土资源部定量预测及勘查评价开放实验室基金
关键词
地层骨架密度
密度
孔隙度
构造沉降量
计算公式
formation grain density
formation average denstiy
formation average porosity
paleo formation grain density
tectonic subsidence
