Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (2): 56-65.doi: 10.12108/yxyqc.20190207

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Diagenesis and porosity evolution of Permian tight reservoirs in Kangning area,eastern margin of Ordos Basin

HUYAN Yuying1,2, JIANG Fujie2, PANG Xiongqi2, LIU Tieshu3, CHEN Xiaozhi3, LI Longlong2,4, SHAO Xinhe2, ZHENG Dingye2   

  1. 1. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, Hebei, China;
    2. College of Geosciences, China University of Petroleum-Beijing, Beijing 102249, China;
    3. CNOOC Research Institute Co., Ltd., Beijing 100028, China;
    4. Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi 214126, Jiangsu, China
  • Received:2018-10-09 Revised:2018-12-04 Online:2019-03-21 Published:2019-03-21

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Abstract: Giant natural gas potential exists in Kangning area in the eastern margin of Ordos Basin which is one of the tight sands gas targets in China. To investigate the diagenesis characteristics and genesis of densification, based on the data of thin sections,scanning electron microscope (SEM),X-ray diffraction,particle size analysis, the rock composition,pore type and diagenesis-porosity evolution process of Permian reservoirs were analyzed. The results show that reservoirs are dominated by fine-medium feldspathic lithic sandstone and lithic sandstone. The average content of quartz is 49%. Rock fragment and feldspar content is in average values of 36% and 15% respectively. The reservoirs are typical low porosity and extra-low permeability tight sandstone,with an average porosity of 7% and an average permeability of 0.46 mD. The pore diameter is small with fine throat and poor sorting. Additionally,secondary dissolved pore dominates the main pore system. The Permian sandstone reservoirs have experienced compaction,cementation and dissolution-replacement,which are divided into middle A-B diagenetic stage. Compaction is the key to cause the formation of tight reservoirs,resulting in a porosity loss of 16.39%. Second leading factor is carbonate cementation and clay mineral filling,which reduces porosity by 12.30%,whereas later dissolution increases porosity by 6.01%. The calculated porosity is almost equivalent to the measured average porosity of 7.46%. The above research results have a certain reference value for searching for secondary dissolution sweet spot in exploration of tight gas reservoirs in the study area.

Key words: diagenesis, porosity evolution, tight sandstone, Permian, Kangning area, Ordos Basin

CLC Number: 

  • TE122.2
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