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Article Navigation >  Acta Sedimentologica Sinica  > 2019  >  37(3): 633-647

WU Piao, HOU DuJie, GAN Jun, DING WenJing, LIANG Gang, LI Xing, FENG XinLuo, WANG Hui. Developmental Model of Oligocene Source Rock in the Eastern Deep-water Area of Qiongdongnan Basin[J]. Acta Sedimentologica Sinica, 2019, 37(3): 633-647. doi: 10.14027/j.issn.1000-0550.2018.158
Citation: WU Piao, HOU DuJie, GAN Jun, DING WenJing, LIANG Gang, LI Xing, FENG XinLuo, WANG Hui. Developmental Model of Oligocene Source Rock in the Eastern Deep-water Area of Qiongdongnan Basin[J]. Acta Sedimentologica Sinica, 2019, 37(3): 633-647. doi: 10.14027/j.issn.1000-0550.2018.158
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Developmental Model of Oligocene Source Rock in the Eastern Deep-water Area of Qiongdongnan Basin

doi: 10.14027/j.issn.1000-0550.2018.158
  • 1.

    School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China;

  • 2.

    Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism, Ministry of Education, China University of Geosciences(Beijing), Beijing 100083, China;

  • 3.

    Exploration and Development Resource Institute, Zhanjiang Branch of China National Offshore Oil Corporation, Zhanjiang, Guangdong 524057, China;

  • 4.

    Oil and Gas Development Department, PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China

Funds:  National Science and Technology Major Project, No. 2016ZX05027-001-003; National Natural Science Foundation of China, No.41472108
  • Received Date: 2018-04-17
  • Rev Recd Date: 2018-07-30
  • Publish Date: 2019-06-10
  • The eastern deep-water area in Qiongdongnan Basin (QDNB) is in the early stages of exploration stage, and some drilling samples collected from this area are severely contaminated by the oil-based mud. Little research regarding the organic geochemistry of the Oligocene source rock deposited in the marine or transitional environments in this area has been performed so far. In this paper, effective oil-cleaning experiments and organic geochemical analysis were carried out for Oligocene mudstone cuttings contaminated by oil-based mud in the eastern deep-water area, coupled with organic geochemical and petrological data of mudstone cuttings in the shallow-water area, and the geochemical characteristics, paleoenvironment, controlling factors, and developmental model of Oligocene source rocks from different sedimentary facies in the eastern QDNB were analyzed. Two distinct models of delta front source rock and neritic source rock were developed according to their organic matter sources and geochemical characteristics. Transitional delta front source rock has fair to good quality and gas-prone type organic matter, and its biomarkers are characterized by pristane/phytane bigger than 3, (nC21+nC22/nC28+nC29) smaller than 1.2, high ratios of oleanane/C30 hopane, T-bicadinane/C30 hopane, low ratios of C23 tricyclic terpane/C30 hopane, C27 sterane/C29 sterane, gammacerane/C30 hopane, and C35 homohopane/C34 homohopane. There exists a strong correlation between total organic carbon (TOC) and total sulfur, which means water in the delta front subface was of oxidation fresh or brackish condition. Organic matter abundance in the delta front source rock is heavily controlled by terrigenous organic matter input. Neritic source rock has fair quality and an organic matter type prone to generating both oil and gas, and the biomarkers are characterized by pristane/phytane smaller than 3, (nC21+nC22/nC28+nC29) bigger than 1.5, low ratios of oleanane/C30 hopane, T-bicadinane/C30 hopane, high ratios of C23 tricyclic terpane/C30 hopane, C27sterane/C29 sterane, gammacerane/C30 hopane, and C35 homohopane/C34 homohopane. However, there exists no correlation between TOC and total sulfur, which means water in the neritic face was of the weak oxidation brackish or saline condition. Organic matter abundance in the neritic source rock is controlled by aquatic organic matter input and influenced by the water environment. Littoral source rock is generally of poor to medium quality and is seldom influenced by organic matter sources and water condition, and the source rock depositional model is considered to be a destructive model.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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  • Received:  2018-04-17
  • Revised:  2018-07-30
  • Published:  2019-06-10

Developmental Model of Oligocene Source Rock in the Eastern Deep-water Area of Qiongdongnan Basin

doi: 10.14027/j.issn.1000-0550.2018.158
  • 1. School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China;
  • 2. Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism, Ministry of Education, China University of Geosciences(Beijing), Beijing 100083, China;
  • 3. Exploration and Development Resource Institute, Zhanjiang Branch of China National Offshore Oil Corporation, Zhanjiang, Guangdong 524057, China;
  • 4. Oil and Gas Development Department, PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China
Funds:  National Science and Technology Major Project, No. 2016ZX05027-001-003; National Natural Science Foundation of China, No.41472108
  • Received Date: 2018-04-17
  • Rev Recd Date: 2018-07-30
  • Publish Date: 2019-06-10

Abstract: The eastern deep-water area in Qiongdongnan Basin (QDNB) is in the early stages of exploration stage, and some drilling samples collected from this area are severely contaminated by the oil-based mud. Little research regarding the organic geochemistry of the Oligocene source rock deposited in the marine or transitional environments in this area has been performed so far. In this paper, effective oil-cleaning experiments and organic geochemical analysis were carried out for Oligocene mudstone cuttings contaminated by oil-based mud in the eastern deep-water area, coupled with organic geochemical and petrological data of mudstone cuttings in the shallow-water area, and the geochemical characteristics, paleoenvironment, controlling factors, and developmental model of Oligocene source rocks from different sedimentary facies in the eastern QDNB were analyzed. Two distinct models of delta front source rock and neritic source rock were developed according to their organic matter sources and geochemical characteristics. Transitional delta front source rock has fair to good quality and gas-prone type organic matter, and its biomarkers are characterized by pristane/phytane bigger than 3, (nC21+nC22/nC28+nC29) smaller than 1.2, high ratios of oleanane/C30 hopane, T-bicadinane/C30 hopane, low ratios of C23 tricyclic terpane/C30 hopane, C27 sterane/C29 sterane, gammacerane/C30 hopane, and C35 homohopane/C34 homohopane. There exists a strong correlation between total organic carbon (TOC) and total sulfur, which means water in the delta front subface was of oxidation fresh or brackish condition. Organic matter abundance in the delta front source rock is heavily controlled by terrigenous organic matter input. Neritic source rock has fair quality and an organic matter type prone to generating both oil and gas, and the biomarkers are characterized by pristane/phytane smaller than 3, (nC21+nC22/nC28+nC29) bigger than 1.5, low ratios of oleanane/C30 hopane, T-bicadinane/C30 hopane, high ratios of C23 tricyclic terpane/C30 hopane, C27sterane/C29 sterane, gammacerane/C30 hopane, and C35 homohopane/C34 homohopane. However, there exists no correlation between TOC and total sulfur, which means water in the neritic face was of the weak oxidation brackish or saline condition. Organic matter abundance in the neritic source rock is controlled by aquatic organic matter input and influenced by the water environment. Littoral source rock is generally of poor to medium quality and is seldom influenced by organic matter sources and water condition, and the source rock depositional model is considered to be a destructive model.

WU Piao, HOU DuJie, GAN Jun, DING WenJing, LIANG Gang, LI Xing, FENG XinLuo, WANG Hui. Developmental Model of Oligocene Source Rock in the Eastern Deep-water Area of Qiongdongnan Basin[J]. Acta Sedimentologica Sinica, 2019, 37(3): 633-647. doi: 10.14027/j.issn.1000-0550.2018.158
Citation: WU Piao, HOU DuJie, GAN Jun, DING WenJing, LIANG Gang, LI Xing, FENG XinLuo, WANG Hui. Developmental Model of Oligocene Source Rock in the Eastern Deep-water Area of Qiongdongnan Basin[J]. Acta Sedimentologica Sinica, 2019, 37(3): 633-647. doi: 10.14027/j.issn.1000-0550.2018.158
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