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The fault and depression characteristics of Mesoproterozoic strata in Hanggin Banner area,northern of Ordos Basin |
SUN Nai-Quan1( ), LI Liang2, PU Ren-Hai3( ), PENG Sheng-Qin4 |
1.School of Geological and Surveying & Mapping Engineering,Chang'An University,Xi'an 710054,China 2.Exploration and Development Institute,North China Branch Company,SINOPEC,Zhengzhou 450006,China 3.State Key Laboratory of Continental Dynamics/Department of Geology,Northwest University,Xi'an 710069,China 4.CNOOC Energy Technology&Services Limited,Tianjin 300457,China |
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Abstract Based on the 2D seismic interpretation in the Hanggin Banner area of northern Ordos Basin,the authors found a rift sequence under Paleozoic strata.On the basis of previous studies and combined analysis of well,seismic data,outcrop and geochemical data in Hanggin Banner area,the stratigraphic framework,possible geological epochs,sedimentary features and petroleum geological conditions of the rift were analyzed.This paper provides new ideas for the exploration of oil and gas in Hanggin Banner area.The Proterozoic strata in the study area is controlled by the SN-trending normal faults of Tamuhan and Dalao,where two half graben fault depressions were formed in western and central part of the study area respectively.The fault depression layers overlie Archean strata and underlie Paleozoic strata in angular unconformities.According to the unmetamorphic terrigenous clastic rocks and tectonic sequence features,it is inferred that fault depression layers should be the middle Proterozonic Changcheng Formation.Drilling and seismic data reveal that the fault depression layer contains fan-delta coarse sandstone and fine conglomerate intercalated locally with neritic mudstones.Depression layer is widely distributed and contains fan-delta sandstone,fine conglomerate and tidal flat brown mudstone.The sandstone within fault depression layers contains coal genetic gas originating from Upper Paleozoic strata.
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Received: 09 July 2019
Published: 26 October 2020
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Corresponding Authors:
PU Ren-Hai
E-mail: nqsun@chd.edu.cn;purenhai@nwu.edu.cn
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2-D seismic survey grid of study area
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The 2D-seismic profile 04-HE101_2 of the fault (a) and geological interpretation profile (b)
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The 2D-seismic profile 02-HE109 of the fault(a) and geological interpretation profile(b)
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Thickness map of fault strata of Mesoproterozoic in Hangjinqi area
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Thickness map of depression strata of Mesoproterozoic in Hangjinqi area
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The field outcrop of Mesoproterozoic
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Comprehensive geological histogram of well Jin13 of Mesoproterozoic in Hangjinqi area
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A cross-well profile of wells Yi23,Jin37,Yi22,Yi17,Jin5,and Jin9 of Mesoproterozoic-Lower Paleozoic in Hangjinqi area
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15] ">
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Structural and modes of gas migration and accumulation of Lower Paleozoic in Hangjinqi area[15]
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Crop and drilled core observations of Mesoproterozoic in wells Jin13 and Jin3
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The cumulative probability curves of Mesoproterozoic core grain sizes in Hangjinqi area
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Sedimentary facies map of depression strata of Mesoproterozoic in Hangjinqi area
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Sedimentary facies map of fault strata of Mesoproterozoic in Hangjinqi area
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