Distribution characteristics of subsalt carbonate source rocksin Majiagou Formation,Ordos Basin

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  • 1.Research Institute of Exploration & Development of PetroChina Changqing Oilfield Company,Xi’an 710018,China;
    2.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China

Received date: 2016-08-08

  Revised date: 2016-10-25

  Online published: 2019-09-06

Abstract

Aimed at the fact of the self-preserved and self-generated characteristics of the Ordovician inside-scene subsalt gas reservoir and ambiguous recognition of the development of its corresponding source rocks,the distribution features of the Ordovician subsalt source rocks in the study area have been analyzed by jointly employing organic geochemistry and well logging technology.The gypsum layers are most widely developed in the 6 sub-members of the member 5 of the Ordovician Majiagou Formation with the widest distribution.The gas production points of the self-stored and self-generated natural gas discovered below the gypsum layers indicate that the marine carbonate source rocks are entitle certain ability for gas generation and discharging.It is indicated in the study that generally the subsalt carbonate source rocks in the Majiagou Formation have low organic matter abundance with a measured mean TOC content of about 0.2%,most of them being lower than 0.5%.The average rock pyrolysis peak temperature reaches 484℃,seating in the stage of highly-mature to overmature.On plane,the subsalt carbonate source rocks show high TOC content in the west,decreasing gradually in the east.It is higher in north Ordos Basin and decreased to the center;however it finally increased in south Ordos Basin.There are three favorable areas for the distribution of relative source rocks in the study area.

Cite this article

Yao Jing-li, Wang Cheng-cheng, Chen Juan-ping, Gao Gang, Wang Fei-yan, Li Xiao-feng, Li Jia-ye, Liu Yan . Distribution characteristics of subsalt carbonate source rocksin Majiagou Formation,Ordos Basin[J]. Natural Gas Geoscience, 2016 , 27(12) : 2115 -2126 . DOI: 10.11764/j.issn.1672-1926.2016.12.2115

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