Quantitative XRD clay mineralogical determination and interpretation of images from scanning electron microscope to predict paleoclimate in sequence D of blocks 15-2 & 15-2/01, Cuu Long basin
The paper presents the results of quantitative XRD analysis performed on 29 samples mainly containing core and cutting samples of wells in sequence D of blocks 15-2 & 15-2/01. The XRD results indicate that the samples consist mainly of quartz, kali-feldspar and plagioclase. The cement minerals include calcite, dolomite, siderite and pyrite. Clay minerals are important constituents in sequence D. The XRD results and interpretation of images from scanning electron microscope (SEM) show that clay minerals in the samples are mainly of illite, kaolinite, chlorite and mixed layer illite-smectite. The clay mineral associations in these samples of sequence D can be classified into three types: (I) illite and mixed layer illite-smectite dominated; (II) kaolinite dominated; and (III): illite, mixed layer illite-smectite, kaolinite and chlorite associated. The change of clay mineral association type with sample depth can indicate the change of paleoclimate and paleoenvironment.
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