The Genesis of Sandbody in the Shallow Delta from Chang 8<sub>1</sub> of Jiyuan Area in Ordos Baisn

LI Shu-tong，WANG Qi，ZHONG Jia-ai，QIU Jun-li，LIU Zhi-wei，QIAO Hua-wei，LIAO Peng

doi:10.11764/j.issn.1672-1926.2013.06.1102

Natural Gas Geoscience >

2013 , Vol. 24 >Issue 6: 1102 - 1108

DOI: https://doi.org/10.11764/j.issn.1672-1926.2013.06.1102

The Genesis of Sandbody in the Shallow Delta from Chang 8₁ of Jiyuan Area in Ordos Baisn

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1.Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,
Lanzhou 730000,China;2.University of Chinese Academy of Sciences,Beijing 100049,China;
3.Engeering and Technology Administration Department of Changqing Oilfield Company,PetroChina,Xi′an 710021,China;4.The third Oil Production Plant of Changqing Oilfield Company,PetroChina,Yinchuan 750006,China.

Received date: 2013-05-21

Revised date: 2013-09-10

Online published: 2013-12-10

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Abstract

Chang 8 member in the Ordos Basin [JP]belongs to shallow-water delta sedimentation,which is different from typical Gilbert delta deposit.Using data of logging,drill core and thin sections,this paper analyzes the transportation distance and the supply of provenances,the properties of the lake water and hydrodynamic condition of Chang 8₁ sandbody in Jiyuan area,so as to determine its sedimentary environment and formation condition.The analysis suggests that the sandbody of Chang 8₁in Jiyuan area is close to the provenance and the provenances are enough and has stable supply ability.In the study area,Chang 8₁ belongs to shallow-water delta deposits which are characterized by shallow and brackish water and gentle topography of the bottom of the lake basin.During the ascending period of base level of Chang 8₁ the aggressive expansion of the water made the driving force of the water expansion greater than that of the river flowing into the lake.On the condition of enough and stable provenance supply and the driving force of the water expansion greater than that of the river flowing into the lake,the sandbody passivity unload ahead of time due to lake water strong top support action,thereby creating a continuous retrogradation sandbody with unobvious superposition stages in vertical but long extended distance and good continuity in horizontal.

Key words： Supply of provenances; Sedimentary environment; Genetic model; Yanchang Formation; Ordos Basin

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LI Shu-tong，WANG Qi，ZHONG Jia-ai，QIU Jun-li，LIU Zhi-wei，QIAO Hua-wei，LIAO Peng . The Genesis of Sandbody in the Shallow Delta from Chang 8₁ of Jiyuan Area in Ordos Baisn[J]. Natural Gas Geoscience, 2013 , 24(6) : 1102 -1108 . DOI: 10.11764/j.issn.1672-1926.2013.06.1102

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