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Geoscience ›› 2022, Vol. 36 ›› Issue (05): 1271-1280.DOI: 10.19657/j.geoscience.1000-8527.2022.045

• Shale Oil & Gas Geology • Previous Articles     Next Articles

Shale Gas Accumulation Factors and Enrichment Area Prediction in Linxing Block, Eastern Margin of the Ordos Basin

CUI Shuhui(), WU Peng(), ZHAO Fei, NIU Yanwei, CAI Wenzhe, WANG Bo   

  1. China United Coalbed Methane Co. Ltd.,Beijing 100011, China
  • Received:2021-12-10 Revised:2022-05-01 Online:2022-10-10 Published:2022-11-03
  • Contact: WU Peng

Abstract:

Based on preliminary exploration results by the China United Coalbed Methane Co. Ltd., we studied the drill-core logging and analysis data, the characteristics of sedimentation, organic geochemistry, reservoir and gas content of the Benxi, Taiyuan and Shanxi formations of the Linxing Block, in the eastern margin of the Ordos Basin. We focused on the shale gas enrichment area. Our results show that the Benxi, Taiyuan and Shanxi formations were deposited in a marine-continental transitional environment. The local muddy shale is medium-high-quality source rocks, with the Taiyuan Formation being the best. The organic matter type is mainly mixed-humus, and the organic matter is generally of mature-high maturity with good hydrocarbon generation potential. Local microcracks are well developed and belong to low-porosity and low-permeability type, and the brittle mineral content of the Shanxi and Taiyuan formations is over 50%, which is conducive to later fracturing. The shale gas enrichment area of the Shanxi Formation is mainly concentrated in the north and southwest, whilst that of the Taiyuan Formation is mainly concentrated in the north and has the best potential. Meanwhile, the shale gas enrichment area of the Benxi Formation is mainly concentrated locally on the margin of the northwest and northeast, with limited resource potential.

Key words: Linxing block, shale gas, enrichment area prediction, Ordos basin

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