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GEOCHEMICAL CHARACTERISTICS OF HIGH-QUALITY HYDROCARBON SOURCE ROCKS IN THE NANPU SAG OF THE BOHAI BAY BASIN, CHINA.
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- Author(s): GUANGYOU ZHU1 ; ZHENGJUN WANG2; JIN SU1
- Source:
Oil Shale. 2013, Vol. 30 Issue 2, p117-135. 19p.- Subject Terms:
- Source:
- Additional Information
- Subject Terms:
- Abstract: In recent years, the Nanpii Sag in the Bohai Bay Basin in eastern China has experienced great discoveries in exploration, and has become a sag most rich in oil and gas in the basin. However, the early evaluation believed that the source rocks were of low quality. Based on numerous samplings and analyses, this paper finds that Es34 (the fourth sub-section of the third member of the Pcdeogene Shahejie Formation) is a high-quality hydrocarbon source rock, its TOC is above 5%. The thickness of high-quality hydrocarbon source rocks is 100 m and that of effective hydrocarbon source rocks about 250 m. The main buried depth of hydrocarbon source rocks is more than 3500 m, vitrinite reflectance (Ro) is more than 0.8%. The amorphous body and algae are an important source of organic matter in the hydrocarbon source rocks. The rocks are enriched with layers of clay and fine-grained calcite, which are the result of seasonal water stratification. The organic layer formed by algae breaking out and settlement is the main source of the organic-rich mudstone layer in Es34in the Nanpu Sag. The biomarkers in Es34reveal that the Es34oil shale has a higher content of 4-methyl steranes, which is significantly different from that in other source rocks. In addition, a detailed comparison of biomarkers and isotopes in the Es34oil shale and oil suggests that the oil in the Nanpu Sag comes mainly from tne Es34source rock, which is an object of future exploration. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Oil Shale is the property of Teaduste Akadeemia Kirjastus and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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