Geochemical Characteristics and Origin of Natural Gas in East Portion of Tarim Basin（II）

CHEN Jian fa; XU Yong chang; HUANG Di fan

Research on chemical components and isotope composition of carbon and hydrogen of natural gases from the Tarim basin shows that all discovered gases in this basin are thermogenic.With respect to source organic matter there are two types of gases: 1)the oil-type gas, which generated from Sinian to lower Palaeozoic marine source rocks with the sapropelic organis matter with-44.5%。-33.8%0 of δ¹³C₁,,-42.0%。-28.1%c of δ¹³C₂,-35.4%。-28. 4%0 of δ¹³C₃, and heavier than- 200%0 of δD₁;2) the coal-type gas, which generated from Mesozoic terrestrial source rocks with the humic organic matter with-40.5%‘-33.1%0 of δ¹³C₁,-29.7%。-21.3%c of δ¹³C₂,-26.3%。-20.3%c of δ¹³C₁,and lighter than-200%0 of δD₁. Based on the geochemical characters and geological setting Tahei uplift region is regarded as having some reservoired gas pools formed by mixed mature oil-type gas with post matured oil-type gas.Some reservoired gas pools are formed by mixed mature oil-type gas with mature coal-type gas.

State Key Laboratory of Gas Geochemistry,Lanzhou Institute of Geology,Chinese Academy of Sciences,Lanzhou 730000

Received Date: 1999-07-04

Rev Recd Date: 2000-05-29

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Abstract: Research on chemical components and isotope composition of carbon and hydrogen of natural gases from the Tarim basin shows that all discovered gases in this basin are thermogenic.With respect to source organic matter there are two types of gases: 1)the oil-type gas, which generated from Sinian to lower Palaeozoic marine source rocks with the sapropelic organis matter with-44.5%。-33.8%0 of δ¹³C₁,,-42.0%。-28.1%c of δ¹³C₂,-35.4%。-28. 4%0 of δ¹³C₃, and heavier than- 200%0 of δD₁;2) the coal-type gas, which generated from Mesozoic terrestrial source rocks with the humic organic matter with-40.5%‘-33.1%0 of δ¹³C₁,-29.7%。-21.3%c of δ¹³C₂,-26.3%。-20.3%c of δ¹³C₁,and lighter than-200%0 of δD₁. Based on the geochemical characters and geological setting Tahei uplift region is regarded as having some reservoired gas pools formed by mixed mature oil-type gas with post matured oil-type gas.Some reservoired gas pools are formed by mixed mature oil-type gas with mature coal-type gas.

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Geochemical Characteristics and Origin of Natural Gas in East Portion of Tarim Basin（II）

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