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Multi-Factor Controlling Diversity of the Ordovician Hydrocarbon Phase in the Tazhong I Block, Tarim Basin, NW China

Author

Listed:
  • Yifeng Wang

    (Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
    Key Laboratory of Gas Reservoir Formation and Development, CNPC, Langfang 065007, China)

  • Weibing Shen

    (Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
    SinoProbe Laboratory, Chinese Academy of Geological Sciences, Beijing 100094, China)

  • Jian Li

    (Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
    Key Laboratory of Gas Reservoir Formation and Development, CNPC, Langfang 065007, China)

  • Chen Zhang

    (Oil and Gas Development Department, Tarim Oilfield Company, PetroChina, Krola 841000, China)

  • Hongzhe Xie

    (Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China)

  • Shuo Chen

    (Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China)

  • Quzong Baima

    (Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China)

  • Chunhong Wang

    (Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China)

Abstract

The distribution characteristics and main controlling factors of hydrocarbon phases in deep strata from petroliferous basins are important for the evaluation of oil–gas resources and decision-making regarding exploration. The distribution characteristics and controlling factors of the Ordovician hydrocarbon phases are systematically analyzed in the Tazhong I block, Tarim Basin, NW China. The results show that the Ordovician reservoirs in the Tazhong I block are characterized as multi-phase reservoirs with a lateral co-existence of condensates, normal oil reservoirs, and heavy oil reservoirs. From east to west, gas-rich in the fault belt and oil-rich in the platform area are presented. Meanwhile, there are regular variations in the geochemical characteristics of the Ordovician hydrocarbon, showing decreasing trends in the gas/oil ratio (GOR), wax contents, dryness coefficients, methane contents, and methane carbonate isotope values (δ 13 C 1 ) and an increasing trend in oil densities. Because the same Cambrian–Lower Ordovician source for the Ordovician hydrocarbon is observed in the Tazhong I block, the regular variations in the hydrocarbon phases and geochemical characteristics can be interpreted as records of gas invasion, biodegradation, multi-stage filling, thermal cracking, and thermochemical sulfate reduction (TSR) rather than controlled by the source rock organofacies. This indicated that different kinds of secondary processes for a diversity of the hydrocarbon phase can appear in one region. Our re-construction of the Ordovician hydrocarbon accumulation model in the Tazhong I block encourages future exploration to target gas reservoirs in the fault belt and oil reservoirs in the platform area.

Suggested Citation

  • Yifeng Wang & Weibing Shen & Jian Li & Chen Zhang & Hongzhe Xie & Shuo Chen & Quzong Baima & Chunhong Wang, 2024. "Multi-Factor Controlling Diversity of the Ordovician Hydrocarbon Phase in the Tazhong I Block, Tarim Basin, NW China," Energies, MDPI, vol. 17(3), pages 1-16, February.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:3:p:723-:d:1332358
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    References listed on IDEAS

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    1. J. E. Dahl & J. M. Moldowan & K. E. Peters & G. E. Claypool & M. A. Rooney & G. E. Michael & M. R. Mello & M. L. Kohnen, 1999. "Diamondoid hydrocarbons as indicators of natural oil cracking," Nature, Nature, vol. 399(6731), pages 54-57, May.
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