计算沉积层古厚度的逐层恢复法

METHOD OF “RECOVER LAYER BY LAYER” FOR CALCULATING THE PALEOTHICKNESS OF SEDIMENTARY LAYER

袁炳存 钱奕中

Yuan Bingcun Qian Yizhong

武汉地质学院 2. 大庆油田物探公司

Wuhan College of Geolog 2. Geophysical Exploration Company, Daqing Oilfield

油气勘探实践证明,绝大多数油气聚集存在于含油气盆地之中,因此,油气田的调查和勘探必须着眼于含油气盆地的研究,研究盆地的沉积史,构造发展史,有机物质演化史以及流体(石油和天然气)的运移和聚集史。在盆地全部地质演化史的研究中,沉积层的厚度是一个极其重要的参数,然而,各个地史时期沉积层的厚度不应该是一个常数,随着它自身埋藏深度的增加而逐渐减薄,这是一个众所周知的客观事实。但是,目前利用厚度法进行地质分析时都运用沉积层的现厚度(或称今厚度)代替各地史时期沉积层的古厚度,这样分析的结果必然产生一定的误差。

This paper describes the principle of the method by "recover layer by layer" for calculating the palaeothickness of sedimentary layer, and the applications and problems existed so far. The method of "recover layer by layer" is established on the concept of compaction of sedimentary layer, which applied the principle hypothesis that the solid height of sedimentary layer is not changed during the compaction. The thickness of sedimentary layer deposited in various geological periods could be recovered by calculating the solid height of sedimentary layer. The further calculations for compaction capacity, different compaction capacity, and changed value on the base boundary of sedimentary layer,the different compaction structures then could be analysed.

https://doi.org/10.11781/sysydz198603253