辽河西部凹陷砂岩碳酸盐含量与孔隙度关系分析

Analysis of the relationship between carbonate cement and porosity in the sandstone of Western Sag in Liaohe Basin

对辽河西部凹陷碳酸盐胶结物含量和砂岩孔隙度的变化关系研究指出:碳酸盐胶结物含量和砂岩孔隙度呈现5种相关关系,即正相关关系、负相关关系、二次函数相关关系、不相关关系和杂乱相关关系,并探讨了不同相关关系的分布,其中二次函数相关关系是研究区发育最多的一种。并且这5种相关关系和层位有很好的对应关系,越是靠下的层位溶解作用相对越强、越复杂,碳酸盐岩含量和砂岩孔隙度关系也就越复杂,不相关关系主要分布在东营组和沙一段,二次函数相关关系主要分布在沙一段和沙二段,负相关关系主要分布在沙三段,杂乱相关关系主要分布在沙四段。在此基础上初步分析了5种相关关系的影响因素,主要包括构造演化、沉积相和成岩作用等。

Study of the relationship between carbonate cement and porosity of the sandstone in Western Sag of Liaohe Basin indicates that carbonate cement and porosity have five correlations,including positive correlation,negative correlation,quadratic function correlation,non-correlation and disordered correlation. The paper also discusses the distribution of the correlations,and quadratic function correlation is the most developed case in the study area.There is a good coincidence relation between these five correlations and strata.Stronger and more complex dissolution appear in deeper strata,where the correlation between carbonate cement and porosity also becomes more complex.Non-correlation mainly distributes in Dongying Formation and Member 1 of Shahejie Formation,quadratic function correlation mainly distributes in Member 1 and 2 of Shahejie Formation, negative correlation mainly distributes in Member 3 of Shahejie Formation,and disordered correlation mainly distributes in Member 4 of Shahejie Formation.On this basis,the influential factors on the five correlations are analyzed,mainly including structural evolution,sedimentary facies,and diagenesis.