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东营凹陷页岩组成对孔隙度的影响
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Abstract:
以XRD分析、有机碳分析和GRI孔隙度测定为基础，探讨了东营凹陷古近系沙河街组三段页岩沉积有机质与矿物的赋存关系，页岩组分对孔隙度的控制作用，以及矿物转化对页岩孔隙度的影响。东营凹陷沙三段页岩中有机质丰度与碳酸盐矿物含量负相关，与粘土矿物含量正相关关系表明：页岩中的碳酸盐为非生物成因，页岩中有机质与粘土矿物共存。控制页岩的孔隙度的组分因素主要包括碳酸盐、粘土矿物和有机质丰度：孔隙度与碳酸盐含量负相关，与粘土矿物含量及有机质丰度正相关。在矿物转化过程中，蒙脱石向伊利石的转化不利于孔隙度的保持，方解石的白云石化对孔隙度增加有积极作用。
Based on XRD, TOC, and GRI porosity analysis, this work discusses the relationship between or-ganic matter and minerals in shales of 3rd member of the palaeogene Shahejie formation in Dongying depression, the control effect of shale components on porosity, and the influence of mineral transformation on porosity. The abundance of organic matter in shales of 3rd member of the Shahejie formation in the Dongying depression is negatively correlated with the content of carbonate minerals, and positively correlated with the content of clay minerals. This indicates that the carbonate in the shales is non-biogenic, and organic matter coexists with clay minerals. The compositional factors that control the porosity of shale mainly include carbonate, clay minerals, and organic matter abundance: porosity is negatively correlated with carbonate content, and positively correlated with clay mineral content and organic matter abundance. In the process of mineral transformation, the conversion of montmorillonite to illite has a harmful effect on the maintenance of porosity, while the dolomitization of calcite has a positive effect on the increase of porosity.
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