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有机酸的形成及分布越来越受到人们的重视。烃源岩的有机质在向干酪根及油气的转化过程中不断地释放出酸性成分 ,释放的有机酸进入储集层水体将改变水介质性质 ,使地层水由碱性变为酸性 ,有利于次生孔隙的形成。通过恢复地层中的有机酸形成过程 ,正确确定烃源岩排酸量及介质中有机酸的浓度 ,有助于预测研究区储集层次生孔隙的形成、发育和分布状况。文中应用柴达木盆地西部地区的实测数据 ,建立了研究区内Ⅱ型干酪根的有机酸生成及演化模式。以模式为指导 ,结合地层压实理论定量恢复E23 和N1 两套烃源岩的有机酸形成演化过程及空间展布特征 ,指出潜在的储集层次生孔隙发育带分布于油泉子构造、咸水泉构造、南翼山构造和南乌斯构造等。图 2表 1参 4(徐怀民摘 )
The formation and distribution of organic acids more and more people’s attention. The organic matter of the source rocks continuously release acidic components during the conversion to kerogen and oil gas. The release of organic acids into the reservoir water will change the nature of the aqueous medium, making the formation water from alkaline to acidic, Formation of green pores. It is helpful to predict the formation, development and distribution of secondary pores in reservoirs in the study area by restoring the formation process of organic acids in the formation and correctly determining the acid output of source rocks and the concentration of organic acids in the medium. Based on the measured data in the western Qaidam Basin, the organic acid generation and evolution pattern of type Ⅱ kerogen in the study area was established. Based on the model and the theory of formation compaction, the evolution and spatial distribution of organic acids in E23 and N1 source rocks are quantitatively recovered. It is pointed out that potential reservoir secondary pore development zones are distributed in the Yumizu structure, Structure, Nanyishan structure and South Ux structure. Figure 2 Table 1 Reference 4 (Xu Huai Min)