Lithologic Reservoirs ›› 2007, Vol. 19 ›› Issue (3): 32-37.doi: 10.3969/j.issn.1673-8926.2007.03.006

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Petroleum migration and accumulation of Yanchang Formation in Jiyuan area , Ordos Basin

YAO Jingli 1 , 2 , WANG Ke2 , SONG Jianghai2 , PANG Jinlian2   

  1. 1. School of sedimentary , Chengdu University of Technology , Chengdu 610059 , China;
    2. Research Institute of Petroleum Exploration and Development , Changqing Oilfield Company , PetroChina , Xi’an 710021 , China
  • Online:2007-09-15 Published:2007-09-15

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Abstract:

Based on the analysis of source rocks , reservoir , dynamics and migration pat hways of Yanchang Formation in J iyuan area , Ordos Basin , the rule of pet roleum migration and accumulation is analyzed. Dark mudstones were developed in t he maximum lake flooding period of Chang 7 , which are t he main source rocks. Most of the reservoir s are extra-low permeability reservoirs. The intergranular pore is t he main space for reservoir , and the pore throat types are mainly thin-pore with micro-throat and micro-pore with micro-throat . Anomalous pressure is the main dynamic for the hydrocarbon migration , and it is closely related to the depth of the duck mudstone. Connected sand bodies are the main migration pathway , in which high permeability in accumulation stage takes an important part . The reservoir distribution of Yan-chang Formation is partly controlled by micro-fractures. Two types of accumulation patterns including “source rocks-connected sand bodies-reservoir”and“source rocks - micro-fractures-reservoir”are finally summarized.

Key words: low permeability, flow unit, single well controlled reserves

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