Abstract
Two samples from outcrops and six core samples of the clay source rocks from the Shiwanshan and Baise Basins were analysed in order to study the variation of selected organic parameters. A comparison of the samples taken from the outcrops with core samples was then performed. The results indicate a significant alteration of the organic matter at and near the surface. A depletion of about 70% TOC and extract yields was seen. The depth influenced by oxidation was found to be about 50 m. The most significant depletion of the organic matter occurred within 16 m.
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