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本文选取鄂尔多斯盆地中东部含缝合线的奥陶系海相碳酸盐岩样品,分别对缝合线和基质进行了岩石铸体薄片、荧光薄片镜下观察、有机碳含量测试、热解分析、全岩X-射线衍射矿物成分以及扫描电镜等一系列实验分析测试,以分析碳酸盐岩缝合线对有机质富集与油气运移的作用。研究表明,缝合线有机质丰度比基质高,含油性比其周围的基质要好,但二者母质类型相近。缝合线中有含量相对较多的黏土、石英、白云石、黄铁矿、黑色沥青、有机质和含量相对较少的方解石。缝合线物质颗粒之间一般呈基底胶结、杂基支撑,其孔隙发育程度、孔隙类型和孔隙密集程度要好于基质,利于油气的运移。总体表明缝合线对于低有机质丰度碳酸盐岩有机质富集、油气生成和流体运移都具有积极作用。
In this paper, Ordovician marine carbonate samples with stitched suture in the eastern and eastern parts of Ordos Basin were selected. The stencils and matrixes were examined by microscopic observation, Rock X-ray diffraction mineral composition and scanning electron microscope and a series of experimental analysis and testing to analyze the effect of carbonate suture on organic matter enrichment and hydrocarbon migration. Studies have shown that suture organic matter abundance higher than the matrix, oily than its surrounding matrix is better, but the two parent material types are similar. Sutures have relatively high levels of clay, quartz, dolomite, pyrite, black pitch, organic matter, and relatively low levels of calcite. Suture material particles are generally between the base of cementitious support, heterogeneous support, the degree of pore development, pore type and pore concentration is better than the matrix, which will facilitate the migration of oil and gas. Overall, the suture shows a positive effect on organic matter enrichment, hydrocarbon generation and fluid migration of carbonate rocks with low organic matter abundance.