Lithofacies of Volcanic Rock at the Top of Upper Carboniferous Stratigraphy in Luxi&nbsp; Area of Junggar Basin

MU  Zhong-Hai, LIU  Ji-Shan, XU  Jie

doi:10.11764/j.issn.1672-1926.2010.01.47

Natural Gas Geoscience >

2010 , Vol. 21 >Issue 1: 47 - 53

DOI: https://doi.org/10.11764/j.issn.1672-1926.2010.01.47

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Lithofacies of Volcanic Rock at the Top of Upper Carboniferous Stratigraphy in Luxi Area of Junggar Basin

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1.Department of Resource and Environment,Southwest Petroleum University,Chengdu 610500,China;
2.Research Institute of Exploration and Development,Xinjiang Oilfieid,Karamay 834000,China

Received date: 2009-03-04

Revised date: 2009-06-21

Online published: 2010-02-10

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Abstract

By geologic information and seismic data, we carry out the sequence division and correlation for the upper Carboniferous stratigraphy in the Luxi area of Junggar basin, and discuss the lithology and lithofacies volcanic rock at the top of the upper Carboniferous stratigraphy. The result suggests that the upper Carboniferous stratigraphy in the Luxi area could be divided into two sequences, such as upper sequence and lower sequence. The top and base boundaries of the upper sequence are regional unconformity, which is shown as the onlap/erosion reflection terminal type in the seismic profile. The rock types in the upper sequence are basalt, andesite, sedimentary tuff, tuff, volcanic breccia, dacite, etc. The volcanic facies included volcanic conduit, explosive, overflow, volcanogenic sedimentation. The volcanic conduit facies can be distinguished by cone reflection in the seismic profile. The lithological rocks in the explosive rock facies are volcanic breccia and tuff, with high electrical resistivity and high velocity, various gamma values but low gamma value, accompanied with variable amplitudes, interrupted continuous reflection or scrambled reflection signature. The lithological rocks in the overflow facies are basalt, andesite and dacite, with high electrical resistivity and high velocity, various gamma value, accompanied with moderate-strong amplitudes, continuouse reflection signature. The lithological rocks in volcanogenic sedimentation facies are composed of normal volcaniclastic rock, sedimentary rock and volcaniclastic sedimentary rock, with electrical property of high gamma, low electrical resistivity and low velocity, as well as high amplitude, high continuouse reflection signature. The explosive rock facies is greatly distributed in the Dabasong uplift and the western and eastern parts of the Xiayan uplift. The volcanogenic sedimentation facies is mainly distributed in the central Xiayan uplift, southern Mahu sag. The other regions show the overflow facies.

Key words： Volcanic facies; Seismic facies; Upper Carboniferous; Luxi area; Junggar basin.

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MU Zhong-Hai, LIU Ji-Shan, XU Jie . Lithofacies of Volcanic Rock at the Top of Upper Carboniferous Stratigraphy in Luxi Area of Junggar Basin[J]. Natural Gas Geoscience, 2010 , 21(1) : 47 -53 . DOI: 10.11764/j.issn.1672-1926.2010.01.47

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