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Kinetic Studies of Source Rocks of Immature Oils

Shen Zhongmin 1 Zhou Guangjia 2 and Hong Zhihua 2 1\ (Dept. of Petroleum Geology of Institute of Chengdu Technology, Chengdu\ 610059) 2\ (Institute of Petroleum Geological Sciences of Shenli Petroleun Adminstration\ 257015)  
This paper shows the results that source rocks of immature oils, which were gathered from the layer of the Upper E Dongying depression, were studied by using kinetic method. These results show that source rocks with shallow-buried, immature, low organic matter abundance properties and related to carbonate rocks can possess a higher rate of hydrocarbon generation and higher average activation energies. Based on these cognitions, it was pointed out that average activation energies might cover the characteristics of immature hydrocarbon generation. Through studies of activation energy distributions of 4 samples, it was supposed that the source rocks which have low activation energy distribution and are now located under the burial depth of mature threshold perhaps used to produce immature oils for the Bamianhe immature oil field, for instance the Niu 11 sample. To determine what materials of the low activation energy distribution range are, the activation energy distributions of soluble organic matters was compared with that of the unextracted sample and it was discovered that materials within the low activation energy distribution range are mainly soluble organic matters. In addition, it was shown that the deepest burial depth of generating immature oils is about 2800 meters in study area and the corresponding activation energy about 177 KJ/mol.
【Fund】: “油气藏地质及开发工程”国家重点实验室基金
【CateGory Index】: P594
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