YUAN Q S, ZHU D S, WANG C,et al.Geological characteristics and fracability analysis of marine-continental transitional facies coal measures shale in Southern North China Basin： A case of Taiyuan Formation，Zhongmu Block[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(1):62-70.

doi:10.16186/j.cnki.1673-9787.2021010102

Received:2021/01/22

Revised:2021/02/24

Published:2023/01/25

Geological characteristics and fracability analysis of marine-continental transitional 

facies coal measures shale in Southern North China Basin： A case of Taiyuan 

Formation，Zhongmu Block

YUAN Qingsong1,3, ZHU Desheng1,3, WANG Chao2,3, LI Zhongming1,3, ZHANG Dong1,3, LI Cong1,3

1.Henan Institute of Geology，Zhengzhou  450001，Henan，China；2.Henan Yukuang Geological Prospecting Investment Co.，Ltd.，Zhengzhou  450001，Henan，China；3.Strategic Alliance for Technological Innovation in Underground Clean Energy Exploration and Development Industry，Zhengzhou  450001，Henan，China

Abstract:In order to explore the fracability characteristics of shale，the marine-continental transitional coal measure shale in the South North China Basin was taken as the research object，and the geological characteristics and fracability of Taiyuan Formation shale reservoir were comprehensively studied by drilling，logging，mud logging and experimental test data.The results showed that Taiyuan Formation shale had the characteristics of low porosity，low permeability，high organic matter abundance，good brittleness，high Young’s modulus，medium Poisson’s ratio，moderate stress difference，and well-growth natural fractures，and also had the foundation of complex fractures formed by fracturing.The new brittleness indexes of shale，sandstone and limestone decreased to different degrees with the largest decrease in limestone.The new method could more reasonably calculate the most real brittleness characteristics of shale.The best fracability section of Taiyuan Formation Well Y2 was the lower part of No.6 layer to the upper part of No.3 layer（depth from 2 862.32 m to 2 887.64 m），the CFI index was 45.26% to 64.65%，average 56.44%，which was higher than the evaluation standard of shale fracability（＞50%）.Vertical well staged fracturing was carried out in the above mentioned section of Well Y2，the stable gas production of 3 614 m³/d was obtained after gas testing，this was 2 times higher than that of the adjacent well Y1.It indicated that the established fracability evaluation model could effectively guide the fracturing construction，and it had better engineering application value.

Key words:Southern North China Basin;marine-continental transitional facies;Taiyuan Formation;shale;geological characteristic;fracability

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