Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (5): 13-22.doi: 10.12108/yxyqc.20200502

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Geochemical characteristics and exploration significance of shale of Lujiaping Formation in northern Dabashan area

ZHONG Hongli1, WU Yufeng1, SHAN Chenchen2   

  1. 1. College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China;
    2. School of Earth Science and Resources, Chang'an University, Xi'an 710064, China
  • Received:2020-01-08 Revised:2020-03-01 Online:2020-10-01 Published:2020-08-08

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Abstract: In order to reveal the hydrocarbon generating potential of the dark shale of Lower Cambrian Lujiaping Formation in northern Dabashan area,based on the geochemical analysis data of the samples of Lujiaping Formation in the outcrop area, the geochemical characteristics of the source rocks and the exploration significance of shale gas were discussed. The results show that the source rocks of Lujiaping formation in northern Dabashan area have high organic matter abundance,and the TOC content of the samples ranges from 0.182% to 9.063% with an average value of 3.21%. The organic matter is typeⅠ-Ⅱ1, and mainly comes from bacteria and algae in low salinity shallow water. The vitrinite reflectance(Ro)ranges from 1.36% to 2.56% with an average value of 1.86%,and the peak temperature of rock pyrolysis(Tmax)ranges from 418℃ to 530℃ with an average value of 460℃. The source rocks have entered a high-maturity to over-maturity stage,indicating that it is in the stage of generating moisture or dry gas,and the original hydrocarbon generation potential is good. The dark shale of Lujiaping Formation in northern Dabashan area is thick with high degree of thermal evolution. The fissures and dissolved pores in the source rocks can become the adsorption storage space of shale gas. Favorable areas for shale gas enrichment are expected to be formed when having weak structural area or footwall with good lateral sealing.

Key words: shale gas, geochemical characteristics, Lower Cambrian, Lujiaping Formation, northern Dabashan area

CLC Number: 

  • TE122.1+13
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