Geochemical Characteristics of Natural Gases and Type Study of Donghe Sandstone Reservoir,Hadexun Oilfield in Tarim Basin

TAO Xiao-wan,LI Ming,JIA Jin-hua,MA De-bo,ZHANG Li-ping

doi:10.11764/j.issn.1672-1926.2014.01.70

2014 , Vol. 25 >Issue 1: 70 - 78

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.01.70

Geochemical Characteristics of Natural Gases and Type Study of Donghe Sandstone Reservoir,Hadexun Oilfield in Tarim Basin

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Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China

Received date: 2013-11-21

Revised date: 2013-12-26

Online published: 2014-01-10

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Abstract

Donghe sandstone is an important exploration target of marine origin hydrocarbon in Tarim Basin.The main purpose of this article is to study the origin of natural gases,reservoir type,as well as hydrocarbon migration direction and path of Donghe sandstone reservoir,Hadexun oilfield.Firstly,based on the data reliability assessment of natural gas compositions,the composition contents,isotopes and their distribution were studied in detail.Then,the origin of natural gases and the reservoir type were discussed,and the hydrocarbon migration path was speculated.Finally,the following conclusions were formed.（1）The crude oil associated gases of Donghe sandstone reservoir in Hadexun Oilfield were oil-type,with high content of N₂,low dry coefficient and less CO₂ content.High level of N₂content was formed by sapropelic organic matter during mature stage,and CO₂ was a mixture of organic and inorganic origin.（2）Donghe sandstone reservoir in Hadexun oilfield actually consists of three relatively independent reservoirs:Hade 4 well area reservoir,Hade 1 well area reservoir and northern wells reservoir (HD113 well-HD111 well-HD4-51 well).They are structural type,structural-lithologic type and lithology-stratigraphic type respectively.（3）With partial reversal in the carbon isotope values of alkane gases,the natural gases of Hade 4 well area reservoir were characterized by low dry coefficient,high content of N₂ and CO₂,and weighted δ¹³C₁,δ¹⁵N and δ¹³C_CO2 values compared with those from Hade 1 well area reservoir.This phenomenon may be due to natural gas leakage in the Hade 4 well area reservoir after hydrocarbon accumulation.（4）At present,Donghe sandstone reservoir of Hadexun Oilfield has already or almost reached the equilibrium state.It′s difficult to form the gas composition and isotope distribution patterns by long distance migration of hydrocarbon from north to south.So,this article speculate that the Donghe sandstone reservoirs were adjusted from the underneath Ordovician reservoir through faults.

Key words： Hadexun Oilfield; Donghe sandstone reservoir; Natural gases; Carbon dioxide; Nitrogen; Stable isotopes

Cite this article

TAO Xiao-wan,LI Ming,JIA Jin-hua,MA De-bo,ZHANG Li-ping . Geochemical Characteristics of Natural Gases and Type Study of Donghe Sandstone Reservoir,Hadexun Oilfield in Tarim Basin[J]. Natural Gas Geoscience, 2014 , 25(1) : 70 -78 . DOI: 10.11764/j.issn.1672-1926.2014.01.70

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