Pressure characteristics and genetic mechanism of Upper Paleozoic in Linxing area of Ordos Basin

Li Yang, Ni Xiao-ming, Wang Yan-bing, Tao Chuan-qi

doi:10.11764/j.issn.1672-1926.2019.01.009

Natural Gas Geoscience >

2019 , Vol. 30 >Issue 7: 997 - 1005

DOI: https://doi.org/10.11764/j.issn.1672-1926.2019.01.009

Pressure characteristics and genetic mechanism of Upper Paleozoic in Linxing area of Ordos Basin

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1.School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo 454000，China；
2.Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region Henan Province，Jiaozuo 454000，China；
3.College of Geo-science and Surveying Engineering，China University of Mining & Technology，Beijing 100083，China

Li Yang(1994-), Male, Master degree candidate, Mainly engaged in coal gas geology research. E-mail：326675568@qq.com.

Received date: 2018-09-07

Revised date: 2019-01-20

Online published: 2019-08-07

Supported by

Supported by the China National Science and Technology Major Project (Grant No. 2016ZX05066001-002).

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Abstract

Finding out the formation pressure characteristics and genesis of Upper Paleozoic in Linxing area of Ordos Basin can lay a foundation for the study of coal measures gas migration and accumulation.Based on the actual measured pressure data and the revised formula，the formation pressure characteristics of Shihezi Formation of Upper Paleozoic in Linxing area are obtained.According to the method of predicting the amount of denudation by acoustic time difference，by using Easy%R_O simulation software and the measured vitrinite reflectance，the burial history and thermal history of the No.8+9 coal seam of Benxi Formation are obtained.Combined with the data of inclusions analyses and the drilling log，the pressure drop of the Upper Paleozoic Shihezi Formation caused by the decrease of ground temperature，under-compaction，gas escape and pore rebound was calculated.The results show that the normal pressure type of the Shihezi Formation in the study area accounts for 23%，the low pressure type accounts for 73%，the overpressure only accounts for 4%，and the formation pressure reached the maximum at the end of the Early Cretaceous；The pressure drop caused by formation denudation is 7.9-17.3 MPa，which accounts for 40%-55% of the whole pressure drop；the pressure drop caused by under-compaction is 1.81-2.24 MPa，which accounts for 7%-11% of the pressure drop；the pressure drop caused by gas escape is 7.61-11.99 MPa，which accounts for 34%-42% of the pressure drop；and the pressure drop caused by pore rebound is 1.68-1.95 MPa，which accounts for 6.40%-6.68% of the pressure drop.There is a positive correlation between sandstone gas volume and pressure coefficient.The research results laid a foundation for the study of the pressure system of the Shihezi Formation in this area.

Key words： Ordos Basin; Formation pressure; Under-compaction; Gas escape; Pore rebound

Cite this article

Li Yang, Ni Xiao-ming, Wang Yan-bing, Tao Chuan-qi . Pressure characteristics and genetic mechanism of Upper Paleozoic in Linxing area of Ordos Basin[J]. Natural Gas Geoscience, 2019 , 30(7) : 997 -1005 . DOI: 10.11764/j.issn.1672-1926.2019.01.009

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