川南地区须家河组天然气地球化学特征及成藏过程

doi:10.3969/j.issn.1673-8926.2017.05.003

Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (5): 19-27.doi: 10.3969/j.issn.1673-8926.2017.05.003

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Geochemical characteristics and accumulation process of natural gas of Xujiahe Formation in southern Sichuan Basin

WANG Peng¹, SHEN Zhongmin², HE Chongkang³, CHEN Gang¹, PAN Shulin¹, WANG Junze³

1. College of Resources and Environmental Engineering, Yibin University, Yibin 644000, Sichuan, China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Chengdu University of Technology, Chengdu 610059, China;
3. Department of Oilfield Development, PetroChina Changqing Oilfield Company, Xi'an 710021, China

Received:2017-01-03 Revised:2017-02-21 Online:2017-09-21 Published:2017-09-21

Abstract

Abstract: Based on the geochemical analysis data,the characteristics,origin,hydrocarbon accumulation stages and process of natural gas of Xujiahe Formation in southern Sichuan Basin were analyzed. The results show that the drying coefficient of natural gas is greater than 0.85,the gas composition is mainly alkane,some contains H₂S,which is the most remarkable feature of gas component of Xujiahe Formation in southern Sichuan Basin. The δ¹³C₁,δ¹³C₂ and δ¹³C₃ values are -43.17‰ to -30.80‰,-33.81‰ to -24.90‰ and -28.65‰ to -22.70‰,respectively, which has the characteristics of positive carbon isotope. The analyses of carbon isotope and light hydrocarbon show that the natural gas is dominated by coal type gas,with some oil type gas existing. The coal type gas is mainly derived from coal-bearing source rocks of Xujiahe Formation,and the oil type gas is mainly derived from underlying marine strata. Base on the hydrocarbon accumulation history,there are mainly three stages of gas accumulation of Xujiahe Formation:(1)From the middle of Late Jurassic to Early Cretaceous,the coal-bearing source rocks of Xujiahe Formation generated a small amount of coal type gas,and then the gas accumulated in Xujiahe Formation.(2)During the Late Cretaceous,the coal-bearing source rocks of Xujiahe Formation generated a large amount of coal type gas,which then accumulated in Xujiahe Formation,and this stage is the most important accumulation period.(3)During Himalayan movement,some oil type gas derived from underlying strata and entered reservoir of Xujiahe Formation along the fault,the fluid charging is the origin of abnormal high temperature inclusions and higher H₂S content.

Key words: coalbed methane, coal structure, array acoustic logging, quantitative identification, coal rock brittleness index

CLC Number:

TE122.1+13

WANG Peng, SHEN Zhongmin, HE Chongkang, CHEN Gang, PAN Shulin, WANG Junze. Geochemical characteristics and accumulation process of natural gas of Xujiahe Formation in southern Sichuan Basin[J].Lithologic Reservoirs, 2017, 29(5): 19-27.

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Geochemical characteristics and accumulation process of natural gas of Xujiahe Formation in southern Sichuan Basin

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