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Journal of Earth Science

, Volume 30, Issue 5, pp 893–907 | Cite as

Insights into the Origin of Natural Gas Reservoirs in the Devonian System of the Marsel Block, Kazakhstan

  • Qianwen Li
  • Xiongqi PangEmail author
  • Ling Tang
  • Wei Li
  • Kun Zhang
  • Tianyu Zheng
  • Xue Zhang
Petroleum, Natural Gas Geology
  • 12 Downloads

Abstract

The genetic type and accumulation model of the Devonian reservoirs in the Marsel Block remain unclear, despite decades of exploration history. According to the well testing, logging interpretations and sample testing results, the Devonian natural gas reservoir in the Marsel Block has five typical characteristics: (1) It is obvious that the traps contain continuous gas accumulations. Not only the apexes of the structures are enriched in natural gas, but also the slopes and depressions contain gas accumulations. (2) The gas reservoirs are classified as tight reservoirs, but there are also reservoirs with high porosity and permeability in some areas. (3) The general negative or low-pressure in the gas reservoir is obvious, although the pressure in the target layers of some wells is close to normal. (4) The yields of single wells in the Devonian reservoir are quite different: some wells have low yields or are dry, whereas the gas production from high-yield wells has reached 700 000 m3/day. (5) The gas-water relationship is complicated: there is no obvious gas-water interface, but the water-producing layer is generally located at the apexes of structures. Research and analysis have shown that using the model of the conventional gas reservoirs genetic type can only explain the characteristics of parts of the gas reservoir, while the model of accumulation in a deep-basin gas reservoir cannot fully explain the distribution characteristics of the Devonian reservoir. However, the model of accumulation in a stacked complex continuous oil and gas reservoir can reasonably explain the geological and distribution characteristics of the Devonian reservoir. Moreover, the predicted gas distribution along a cross-section of the reservoir is also in agreement with the geological background and tectonic environment of the Marsel Block, therefore, the genetic type of the Devonian natural gas reservoir in the Marsel Block is a stacked complex continuous tight-gas reservoir. Finally, by comprehensively analyzing the source rock, reservoir and cap rocks, as well as the structural characteristics, it is verified that Devonian in the Marsel Block has favorable geological conditions for formation of a superimposed continuous tight gas reservoir.

Key words

stacked complex continuous tight-gas reservoirs Devonian Kazakhstan 

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Notes

Acknowledgments

This research was financially supported by the Natural Science Foundation of China (No. 41572106), and the National Major Projects of China (No. 2017ZX05036004). We greatly acknowledge other professors and partners at the project group. Also, we would like to express our heartfelt gratitude to Dr. Junqing Chen and associate Prof. Pang Hong, who give great suggestions to the article research ideas and English writing. The insightful reviews by the editors and reviewers significantly improve the manuscript, for which we are also grateful. The final publication is available at Springer via https://doi.org/10.1007/s12583-019-1016-4.

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Copyright information

© China University of Geosciences (Wuhan) and Springer-Verlag GmbH Germany, Part of Springer Nature 2019

Authors and Affiliations

  1. 1.State Key Laboratory of Petroleum Resources and ProspectingBeijingChina
  2. 2.SINOPEC Petroleum Exploration and Production Research InstituteBeijingChina
  3. 3.College of GeosciencesChina University of PetroleumBeijingChina
  4. 4.Unconventional National Gas InstituteChina University of PetroleumBeijingChina
  5. 5.Faculty of EngineeringUniversity of NottinghamNottinghamUK

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