天然气轻烃指标的地质意义——以鄂尔多斯盆地神木气田与塔西南坳陷山前带天然气藏为例

doi:10.11743/ogg20170505

Abstract

Abstract: Light hydrocarbon has abundant geochemical information and great geological significance.Using a series of light hydrocarbon parameters,the natural gas from Shenmu gas field in the Ordos Basin and piedmont zone of the southwest Tarim Basin were analyzed.The results show that the Shenmu and Akemomu gas field are mainly coal-derived gas.However,the former is mixed by partial oil-type gas.The natural gas from Kekeya-Kedong gas field is mainly mixed gas.For the first time,the alkane index parameter is put forward.When the index is above 2,it means the gas is oil-derived gas or mixed gas.When it is below 2,it means the gas is oil-derived gas.The natural gas from Shenmu gas field originated from the same source rocks according to K₁ and K₂ parameter.However,the gas from piedmont zone of the southwest Ta-rim Basin originated from different source rocks.According to Mango parameter intersection chart,the source rocks of Shenmu and Akemomu gas field were mainly from terrestrial higher plant origins.However,the source rocks of Kekeya-Kedong gas field are mixed.Based on isoheptane and n-heptane parameter,the maturity of Shenmu,Akemomu and Kekeya-Kedong gas field is low-normal stage,mature gas and high maturity gas stage,respectively.

Key words: maturity, light hydrocarbon parameter, gas-source correlation, genetic type, natural gas, Shenmu gas field, southwest Tarim Basin

CLC Number:

TE122.1

Han Wenxue, Ma Weijiao, Hou Lianhua, Tao Shizhen, Hu Guoyi, Peng Weilong. Geological significance of light hydrocarbon index of natural gas:Taking Shenmu gas field and piedmont zone of the southwest Tarim Basin as examples[J]. Oil & Gas Geology, 2017, 38(5): 869-877.

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Geological significance of light hydrocarbon index of natural gas:Taking Shenmu gas field and piedmont zone of the southwest Tarim Basin as examples

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