Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (6): 45-55.doi: 10.12108/yxyqc.20240605

• PETROLEUM EXPLORATION • Previous Articles     Next Articles

Reservoir forming conditions and exploration prospect of Jurassic coalbed methane encircling Dongdaohaizi sag，Junggar Basin

YU Qixiang1,2, LUO Yu1,2, DUAN Tiejun1,2, LI Yong3, SONG Zaichao1,2, WEI Qingliang1,2   

  1. 1. Wuxi Petroleum Geology Institute, Research Institute of Petroleum Exploration and Development, SINOPEC, Wuxi 214126, Jiangsu, China;
    2. Key Laboratory of Petroleum Accumulation Mechanisms, SINOPEC, Wuxi 214126, Jiangsu, China;
    3. College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China
  • Received:2024-04-29 Revised:2024-07-16 Online:2024-11-01 Published:2024-11-04

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Abstract: A series of studies，such as coal seam connecting well profiles，logging-seismic calibration，seismic profile interpretation ，analysis of coal seam logging data，have been carried out to clarify the exploration direc tion of coalbed methane in the area of Encircling Dongdaohaizi sag. The results show that：（1）The Jurassic Xishanyao Formation and Badaowan Formation in this area developed coal seams with thick，widely distribu tion. Xishanyao Formation develops 2-3 layers of coal seams，with a cumulative maximum thickness of 20 m， Badaowan Formation develops 2-4 layers of coal seams，with a cumulative maximum thickness of 29 m. Analy sis of coal rock gas content and abnormal logging gas shows that good gas bearing property.（2）The analysis of the main controlling factors for coalbed methane reservoir formation indicates that the middle and lower Jurassic coal measure source rocks in the sag good，reaching a medium to good e source rock level，with Ro value rang ing from 0.6% to 0.8%. It has good ability to generate hydrocarbon gas. In addition，based on the analysis results of natural gas carbon isotopes，coalbed methane also can come from deep highly mature humic source rock. （3）Xishanyao Formation coal rock is a medium-low porosity and low permeability reservoir，with value of po rosity range from 7.0% to 20.8%，value of permeability range from 0.32 mD to 8.67 mD. Badaowan Formation coal rock is a low porosity and medium-low permeability reservoir，with value of porosity range from 5.6% to 7.8%，value of permeability range from 2.3 mD to13.83 mD. The coal seam is sandwiched between mudstones， and the regional mudstone cover is widely distributed above the coal seam，due to a good sealing conditions in this area.（4）There are two modes of coalbed methane enrichment and accumulation in this area：The model of coalbed methane enrichment and accumulation in the source area of the sag and a model of enriched external gas accumulation in the deep bulge area. It is considered that there are greater exploration potential of encircling Dongdaohaizi sag，especially，exploration in slope area of Dongdaohaizi sag northeastern direction and Dongdaohaizi sag northern slope to Dinan uplift.

Key words: coalbed methane, accumulation in the source, accumulation out-of-source, slope area, lower po rosity and low permeability, regional mudstone cap, Xishanyao Formation, Badaowan Formation, Jurassic, en circling Dongdaohaizi sag, Junggar Basin

CLC Number: 

  • TE122.2
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