Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (6): 77-88.doi: 10.12108/yxyqc.20240608

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Palaeozoic gas reservoir-forming conditions and main controlling factors in Xunyi area，southern Ordos Basin

Guan Yunwen1, Su Siyu2, Pu Renhai1, Wang Qichao3, Yan Sujie1, Zhang Zhongpei3, Chen Shuo2, Liang Dongge4   

  1. 1. Department of Geology, Northwest University, Xi'an 710069, China;
    2. Shaanxi Coalfield Geophysical Surveying and Mapping Co., Ltd, Xi'an 710069, China;
    3. Sinopec Petroleum Exploration and Production Research Institute, Beijing 102206, China;
    4. The Second Gas Production Plant, Changqing Oilfield Company, Yulin 719000, Shannxi, China
  • Received:2024-06-06 Revised:2024-07-04 Online:2024-11-01 Published:2024-11-04

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Abstract: The exploration and development prospects of the Paleozoic area in the southern Ordos Basin are promising，but the exploration results have been unsatisfactory. Based on the latest core analysis，data of logging and 2D/3D seismic，a comprehensive evaluation was conducted for the Palaeozoic of Xunyi area. This evaluation focused on four aspects：gas source conditions，reservoir quality，source-reservoir configuration，and fracture conductivity. The results show that：（1）In the Xunyi area，potential hydrocarbon source rock types have been identified in the Taiyuan-Shanxi formations：black coal rock，black carbonaceous mudstone，dark gray，and gray mudstone. The organic matter types are all Type Ⅲ，with a vitrinite reflectance（Ro）ranging from 1.8% to 2.5%，indicating a high level of thermal maturity. The black coal rock and carbonaceous mudstone exhibit better hydrocarbon generation potential compared to the dark gray and gray mudstones.（2）The reservoirs are charac terized by ultra-low porosity and ultra-low permeability. The upper Paleozoic Shanxi Formation and He 1 mem ber consist of clastic rock reservoirs，with lithic sandstones accounting for 79%，and matrix content averaging 29%. The pore types are mainly intergranular and secondary dissolution pores，with plane porosity lower than 3%. The He 1 member is characterized by strong cementation and weak dissolution facies，while the Shanxi For mation exhibits strong compaction and matrix-rich infill facies. The high-quality carbonate reservoirs of the lower Paleozoic Majiagou Formation are dominated by sandy dolomite，with storage space mainly comprising dissolu tion pores，intercrystalline pores，and fractures. （3）The Paleozoic source-reservoir configurations include “lower-generation upper-storage”，“upper-generation lower-storage”，and“adjacent lateral-storage”configura tions. Among these，the adjacent lateral-storage configuration is the favorable source-reservoir combination for the lower Paleozoic Majiagou Formation. The Xunyi area experienced three phases of fault development：Paleo zoic，Triassic，and late Jurassic，with the late Jurassic faults providing good vertical fluid migration pathways. （4）The lower Paleozoic gas reservoirs are controlled by the pre-Carboniferous paleogeomorphology. The area adjacent to the eastern side of the deeply eroded paleotroughs is a favorable zone for Lower Paleozoic hydrocar bon accumulation. The upper Paleozoic gas reservoirs are controlled by effective drainage systems. Poor reservoir properties and the lack of open source-conducting faults in the northern part of the study area are the main rea sons for the unfavorable results in the upper Paleozoic.

Key words: natural gas, accumulation conditions, reservoir characteristics, source-reservoir configuration, fault-controlled reservoir, Paleozoic, Xunyi area, Ordos Basin

CLC Number: 

  • TE122.1
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