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Study on hydrocarbon-generation of lacustrine source rocks based on hydrous pyrolysis experiments of source rocks from Jizhong Depression,Bohai Bay Basin

Chen Xiao-yan,Tian Fu-qing,Zou Hua-yao,Guo Liu-xi,Lu Xiao-wei,Yin Jie,Wang Dao-jun   

  1. 1.School of Geosciences,China University of Petroleum,Beijing 102249,China;
    2.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China;
    3.Exploration and Development Research Institute,PetroChina Huabei Oilfield Company,Renqiu 062552,China
  • Received:2017-08-20 Revised:2017-09-30 Online:2018-01-10 Published:2018-01-10

Abstract:

Based on hydrocarbon generation from source rocks with increasing thermal maturity,quantitative models for hydrocarbon generation of lacustrine source rocks are concluded by hydrous gold-tube pyrolysis experiments and GC analysis of eight immature samples from different types of organic matters in Jizhong Depression,Bohai Bay Basin.The types of organic matters (OM) from lacustrine source rocks mainly contain TypeⅠ,Type Ⅱ1 and Type Ⅱ2.Their oil window is basically coincident and %RO is correspondingly at 0.6%-1.3%,while %RO  at 0.9%,oil yields reaching the peak value,about 580,350 and 260mg/gTOC respectively for TypeⅠ,Type Ⅱ1 and Type Ⅱ2.But the corresponding %RO value of Type Ⅰ,Type Ⅱ1 and Type Ⅱ2 decreases when oil-generating potential is exhausted.There is two stages of gas-generating,gas from kerogen cracking at %RO  below 1.3% and oil cracking at %RO  exceeding 1.3% respectively.The gas yield from kerogen cracking of Type Ⅰ is exceeding 100mL/gTOC,higher than the similar yields of Type Ⅱ1 and Type Ⅱ2,about 70-80mL/gTOC.However,it is difficult to quantitatively research the yield of gas from oil cracking,which is controlled by oil expulsion efficiency.The yields of three OM types from lacustrine source rocks are enough to form industrial gas fields when the conditions of accumulation and preservation are allowed.

Key words: Pyrolysis experiment, Thermogenic hydrocarbon-generating, Lacustrine source rocks, Jizhong Depression

CLC Number: 

  • TE122.1+13

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