Distribution Characteristics and Controlling Factors Analyses on Incised PaleochannelReservoir of Valley Filling in Jurassic of Wuqi Area,Ordos Basin

LI Feng-jie,LI Lei,LIN Hong,YANG Yu-chuan,FANG Chao-gang,MENG Li-na

doi:10.11764/j.issn.1672-1926.2013.06.1109

2013 , Vol. 24 >Issue 6: 1109 - 1117

DOI: https://doi.org/10.11764/j.issn.1672-1926.2013.06.1109

Distribution Characteristics and Controlling Factors Analyses on Incised PaleochannelReservoir of Valley Filling in Jurassic of Wuqi Area,Ordos Basin

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Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China

Received date: 2013-04-07

Revised date: 2013-05-31

Online published: 2013-12-10

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Abstract

On the background of incised paleochannel of large-scale valley filling,4 types of paleogeomorphology units,including incised-valley,clinoform,mound and lower monadnock,are developed in Wuqi area of Ordos Basin.Among the 4 types,mound,clinoform and lower monadnock are the main distribution units of the reservoir.The main accumulation locations of the oil are highs of the lower monadnock on the clinoform,source of the secondary river and the two-level mound mouth.Bottom water system in the incised paleochannel is well developed,which drove the oil-gas across the one-level mound mouth generated by the cutting of the two-level and three-level paleochannels,then reached the two-level mound mouth generated by the cutting of three-level and four-level paleochannels,and accumulated.The resultant force difference formed by the superimposition of the pressure generated by both sides of the paleochannel slope and the pressure generated by the regional monocline formation,causes the differences in the occurrence position of reservoirs at both sides of the paleochannel.The main occurrence positions in northeast bank of the Mengshan paleochannel are Yan 9,Yan 8 and Yan 7 oil-bearing formations of the Upper Jurassic.And the main occurrence positions in southwest bank are Fuxian and Yan 10 oil-bearing formations of the Lower Jurassic.

Key words： Paleogeomorphology; Valley filling; Distribution of the reservoir; Genesis; Jurassic; Ordos Basin

Cite this article

LI Feng-jie,LI Lei,LIN Hong,YANG Yu-chuan,FANG Chao-gang,MENG Li-na . Distribution Characteristics and Controlling Factors Analyses on Incised PaleochannelReservoir of Valley Filling in Jurassic of Wuqi Area,Ordos Basin[J]. Natural Gas Geoscience, 2013 , 24(6) : 1109 -1117 . DOI: 10.11764/j.issn.1672-1926.2013.06.1109

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