The Cause of Ultra Deep-seated Oil and Gas of Paleogene in Baxian Sag

WANG Jian，WANG Quan，SHI Yu-lei，MA Xue-feng，ZHONG Xue-mei，LI Xiang-yang，WANG Fei-yu

doi:10.11764/j.issn.1672-1926.2015.01.0021

Natural Gas Geoscience >

2015 , Vol. 26 >Issue 1: 21 - 27

DOI: https://doi.org/10.11764/j.issn.1672-1926.2015.01.0021

The Cause of Ultra Deep-seated Oil and Gas of Paleogene in Baxian Sag

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1.China University of Mining & Technology,Beijing 100083,China|
2.Exploration and Development Research Institute,PetroChina Huabei Oilfield Company,Renqiu 062552,China|
3.China University of Petroleum,Beijing 102249,China

Received date: 2014-03-11

Revised date: 2014-05-13

Online published: 2015-01-10

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Abstract

According to the organic geochemical analysis of the ultra deep-seated oil and gas of Paleogene in Baxian Sag,the crude oil density is in the range of 0.77 to 0.83g/cm3.The oil shows wet gas feature,and methane content of natural gas is under 90%,belonging to light-oil -volatile oil.The analysis of gas chromatographic of the saturated hydrocarbon,GC-MS and the carbon isotopes indicate that oil-gas are derived from the 4th member of Shahejie Formation source rocks.The crude oil in the 4th member of Shahejie Formation obviously contains oleanane,sterane C₂₉>C₂₇,low gas isotope(δ¹³C₂value lower than -32‰ is oil type gas).However,buried-hill oils contain sterane C₂₇>C₂₉ but no oleanane.The gas isotope is high,which is a typical feature of coal-formed gas,i.e.,δ¹³C₂value is more than -25‰.The crude oil of the 4th member of Shahejie Formation and the gas in buried-hill were rather similar to the humic source rock,while natural gas in the 4th Member of Shahejie Formation and crude oil in the buried-hill are more similar to the sapropelic source rock.Oil-source correlation results are corresponding to the research on source rock heterogeneity of the 4th member of Shahejie Formation in the Baxian Sag in recent years.The C₁/C₂of natural gas in Niudong 1 ultra-deep buried hill was 13, C₁/C₃ is 37,dryness coefficient reaches 94.9%,and the concentration of diamondoid of 3MD and 4MD is in the range of 35.4 to 37.9μg/g.It is indicated that the gas derived from high maturation phase and high GOR fluid charged directly,rather than genetic of oil-cracking in oil-generating window phase.Accounting for petroleum source and cause of ultra deep oil simultaneously,it is concluded that ultra deep formation still has tremendous exploration prospects.

Key words： Baxian Sag; Ultra deep formation; Diamondoid; Origin of gas

Cite this article

WANG Jian，WANG Quan，SHI Yu-lei，MA Xue-feng，ZHONG Xue-mei，LI Xiang-yang，WANG Fei-yu . The Cause of Ultra Deep-seated Oil and Gas of Paleogene in Baxian Sag[J]. Natural Gas Geoscience, 2015 , 26(1) : 21 -27 . DOI: 10.11764/j.issn.1672-1926.2015.01.0021

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