Genetic Analysis of the Lenticular Sand in the Paleogene Dainan Formation in Huangjue-Majiazui Area in Gaoyou Sag

LIU Jin-hua，WU Li-feng，WU Yan-mei，LIU Jian，LUO Hong-fei

doi:10.11764/j.issn.1672-1926.2015.02.0261

Natural Gas Geoscience >

2015 , Vol. 26 >Issue 2: 261 - 268

DOI: https://doi.org/10.11764/j.issn.1672-1926.2015.02.0261

Genetic Analysis of the Lenticular Sand in the Paleogene Dainan Formation in Huangjue-Majiazui Area in Gaoyou Sag

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The Geology Research Institute Jiangsu Oilfield,SINOPEC,Yangzhou 225012,China

Received date: 2014-03-26

Revised date: 2014-07-13

Online published: 2015-02-10

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Abstract

Fan-delta was developed in the Dainan Formation of Gaoyou Sag,and the distribution of the sandbody was controlled by the distributary channel,but the existence of many lenticular oil-sand is inconsistent with the distribution of reservoir,so we do the genetic research on the lenticular sand.The overlapping oil-bearing area of Dainan Formation is continuous,but the oil-bearing area of the single sublayer is lenticular or allantoid.By the analysis of the water injection response,the communication of the sand is bad,response wells are little,the better response wells followed the provenance direction,but the distance of the response well is short,so the characteristic of the water injection showed that the reservoirs of the work area are with higher anisotropy.After the observation of well core,there are many soft sediment deformations,and on the base of the foreign experience,especially the theory of detrital liquid by Shanmugam,the small-size olistostrome genetic model of lithologic hydrocarbon reservoir was set up,and we think that the lenticular oil-sand was formed by the olistostrome in the layer,and the soft sediment deformation caused the bad physical property of the reservoir,so the distribution of the oil sand became lenticular.

Key words： Lenticular sand; Olistostrome; Soft Sediment deformation; Gaoyou Sag; Dainan Formation

Cite this article

LIU Jin-hua，WU Li-feng，WU Yan-mei，LIU Jian，LUO Hong-fei . Genetic Analysis of the Lenticular Sand in the Paleogene Dainan Formation in Huangjue-Majiazui Area in Gaoyou Sag[J]. Natural Gas Geoscience, 2015 , 26(2) : 261 -268 . DOI: 10.11764/j.issn.1672-1926.2015.02.0261

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