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| Title: | Origin and accumulation of carbon dioxide in the Huanghua depression, Bohai Bay Basin, China |
| Author (s): | Zhang, Tongwei Zhang, Mingjie Bai, Baojun Wang, Xianbin Li, Liwu |
| Department/Lab Affiliations: | Energy Research and Development Center Geological Sciences & Engineering |
| Keywords: | depression gas geochemistry mantle degassing natural gas postmagmatic stage sedimentary basin tectonic regions thermal decomposition |
| Issue Date: | 2008-03 |
| Publisher: | American Association of Petroleum Geologists (AAPG) |
| Citation: | Zhang, Tongwei, Zhang, Mingjie., Bai, Baojun., Wang, Xianmin., and Li, Liwu. "Origin and accumulation of carbon dioxide in the Huanghua depression, Bohai Bay Basin, China." American Association of Petroleum Geologists Bulletin, vol. 92, no. 3, 2008. |
| Abstract: | The CO2 content in natural gas in the Huanghua depression, Bohai Bay Basin, China, is highly variable, ranging from 0.003 to 99.6%. Understanding the origin and distribution of the CO2 is important to assess risk prior to drilling. This study uses gas geochemistry to identify the origins of CO2 in the sedimentary basin and places these findings within a geologic context. Chemical compositions, d13CCO2 , 3He/4He, and 40Ar/36Ar were measured for 50 gas samples collected from gas- and oil-producing wells located in different tectonic regions in the depression. From these analyses, we determined that the CO2 in the Huanghua depression originated from three sources: thermal decomposition of organic matter, thermal decomposition of carbonate minerals, and mantle degassing. Gases with low amounts (<3%) of CO2 tend to be organogenic. This organogenic CO2 occurs in hydrocarbon accumulations and is characterized by d13CCO2 values ranging from –20 to –10{per thousand} and low 3He/4He (R/Ra < 1, herein R and Ra represent the 3He/4He ratio of sample and air, respectively). Carbon dioxide originating from thermal carbonate decomposition occurs as a minor component (<10%) in hydrocarbon gas accumulations and is characterized by a narrow range of d13CCO2 (–2 to +2{per thousand}) and R/Ra < 1. Huanghua depression natural gases with CO2 content in excess of 15% resulted from mantle degassing and mainly occur at the intersection of faults. These gases have 3He/4He ratios in excess of atmospheric value (R/Ra > 1) and d13CCO2 ranging from –5 to –3{per thousand}. Volatiles from mantle degassing during the postmagmatic stage are the most likely major source for CO2 in these high-CO2-content reservoirs. Basement faults likely provide pathways for the upward migration of CO2-rich mantle fluids. Consequently, CO2-rich gas pools are locally concentrated in the Gangxi and Dazhongwang fault zones within the depression. |
| Type: | Article - Journal text |
| In Title: | American Association of Petroleum Geologists Bulletin |
| Copyright Notice: | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. Unknown Policy FULL COPYRIGHT INFORMATION: |
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| title | Origin and accumulation of carbon dioxide in the Huanghua depression, Bohai Bay Basin, China |
| contributor.author | Zhang, Tongwei |
| contributor.author | Zhang, Mingjie |
| contributor.author | Bai, Baojun |
| contributor.author | Wang, Xianbin |
| contributor.author | Li, Liwu |
| contributor.deptlab | Energy Research and Development Center |
| contributor.deptlab | Geological Sciences & Engineering |
| contributor.sponsor | National Natural Science Foundation of China |
| subject | depression |
| subject | gas geochemistry |
| subject | mantle degassing |
| subject | natural gas |
| subject | postmagmatic stage |
| subject | sedimentary basin |
| subject | tectonic regions |
| subject | thermal decomposition |
| date.issued | 2008-03 |
| publisher | American Association of Petroleum Geologists (AAPG) |
| identifier.citation | Zhang, Tongwei, Zhang, Mingjie., Bai, Baojun., Wang, Xianmin., and Li, Liwu. "Origin and accumulation of carbon dioxide in the Huanghua depression, Bohai Bay Basin, China." American Association of Petroleum Geologists Bulletin, vol. 92, no. 3, 2008. |
| identifier.pub.URI | |
| description.abstract | The CO2 content in natural gas in the Huanghua depression, Bohai Bay Basin, China, is highly variable, ranging from 0.003 to 99.6%. Understanding the origin and distribution of the CO2 is important to assess risk prior to drilling. This study uses gas geochemistry to identify the origins of CO2 in the sedimentary basin and places these findings within a geologic context. Chemical compositions, d13CCO2 , 3He/4He, and 40Ar/36Ar were measured for 50 gas samples collected from gas- and oil-producing wells located in different tectonic regions in the depression. From these analyses, we determined that the CO2 in the Huanghua depression originated from three sources: thermal decomposition of organic matter, thermal decomposition of carbonate minerals, and mantle degassing. Gases with low amounts (<3%) of CO2 tend to be organogenic. This organogenic CO2 occurs in hydrocarbon accumulations and is characterized by d13CCO2 values ranging from –20 to –10{per thousand} and low 3He/4He (R/Ra < 1, herein R and Ra represent the 3He/4He ratio of sample and air, respectively). Carbon dioxide originating from thermal carbonate decomposition occurs as a minor component (<10%) in hydrocarbon gas accumulations and is characterized by a narrow range of d13CCO2 (–2 to +2{per thousand}) and R/Ra < 1. Huanghua depression natural gases with CO2 content in excess of 15% resulted from mantle degassing and mainly occur at the intersection of faults. These gases have 3He/4He ratios in excess of atmospheric value (R/Ra > 1) and d13CCO2 ranging from –5 to –3{per thousand}. Volatiles from mantle degassing during the postmagmatic stage are the most likely major source for CO2 in these high-CO2-content reservoirs. Basement faults likely provide pathways for the upward migration of CO2-rich mantle fluids. Consequently, CO2-rich gas pools are locally concentrated in the Gangxi and Dazhongwang fault zones within the depression. |
| type | Article - Journal |
| type.DCMIType | text |
| rights | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. |
| rights | Unknown Policy |
| rights.URI | |
| relation.isPartOf | American Association of Petroleum Geologists Bulletin |
| date.available | 2008-07-28T16:20:21Z |
| identifier.persist.URI |