Evidence for multiple stages of oil cracking and thermochemical sulfate reduction in the Puguang gas field, Sichuan Basin, China

AAPG Bulletin ◽  
2008 ◽  
Vol 92 (5) ◽  
pp. 611-637 ◽  
Author(s):  
Fang Hao ◽  
Tonglou Guo ◽  
Yangming Zhu ◽  
Xunyu Cai ◽  
Huayao Zou ◽  
...  
Keyword(s):  
Sulfate Reduction ◽  
Sichuan Basin ◽  
Gas Field ◽  
Thermochemical Sulfate Reduction ◽  
Oil Cracking ◽  
Puguang Gas Field ◽  
Multiple Stages

scholarly journals Sulfate Sources of Thermal Sulfate Reduction (TSR) in the Permian Changxing and Triassic Feixianguan Formations, Northeastern Sichuan Basin, China

Geofluids ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Pingping Li ◽  
Huayao Zou ◽  
Fang Hao ◽  
Xinya Yu
Keyword(s):  
Sulfate Reduction ◽  
Sichuan Basin ◽  
Sulfur Isotopes ◽  
Adjacent Area ◽  
Gas Field ◽  
Northeastern Part ◽  
Solid Bitumen ◽  
The Sichuan Basin ◽  
Gas Fields ◽  
Puguang Gas Field

Thermal sulfate reduction (TSR) occurred throughout the Permian Changxing (P2c) and Triassic Feixianguan (T1f) dolostone reservoirs in the western and eastern parts of the Kaijiang-Liangping (K-L) trough in the northeastern part of the Sichuan Basin. To determine the sulfate sources of this TSR, fourteen solid bitumen samples and eight anhydrite samples were collected from the northeastern part of the Sichuan Basin. These samples were analyzed to determine their sulfur isotopes. In addition, untreated, HNO3-treated, and CrCl2-treated solid bitumen samples were analyzed to determine their sulfur isotopes in order to obtain reliable δ34S data for the TSR solid bitumen. The results show that the HNO3 method is more effective at removing pyrite from solid bitumen than the method using CrCl2 thrice because the HNO3-treated solid bitumen has lower sulfur contents and higher δ34S. The δ34S of the T1f solid bitumen samples from the Puguang gas field (in the eastern part of the K-L trough, 12.0-24.0‰) is significantly lower than that of the samples from the Yuanba gas field (in the western part of the K-L trough, 24.1-34.2‰). The δ34S of the T1f1–2 anhydrite is 18.1-26.6‰, which is lower than that of the T1f3–4 anhydrite samples (29.9-39.6‰). The TSR sulfates from the Puguang gas field were most likely from the coeval T1f1–2 evaporating seawater and were enriched during the reflux-seepage dolomitization process. The TSR sulfates from the Yuanba gas field were primarily caused by the evaporation of seawater during the T1f4. First, the evaporating seawater would flow vertically into the P2c reservoirs in the adjacent area, and then, it would flow laterally into the P2c reservoirs in the Yuanba gas field. Considering the fact that the sulfate sources of TSR and the δ34S values of the TSR sulfates are different in the Puguang and Yuanba gas fields, the δ34S of TSR solid bitumen cannot be simply used to show the extent of TSR.

Accumulation Mechanisms and Evolution History of the Giant Puguang Gas Field, Sichuan Basin, China

2009 ◽  
Vol 83 (1) ◽  
pp. 136-145 ◽  
Author(s):  
Fang HAO ◽  
Tonglou GUO ◽  
Chunguo DU ◽  
Huayao ZOU ◽  
Xunyu CAI ◽  
...  
Keyword(s):  
Sichuan Basin ◽  
Gas Field ◽  
History Of ◽  
Puguang Gas Field

The Puguang gas field: New giant discovery in the mature Sichuan Basin, southwest China

AAPG Bulletin ◽  
2007 ◽  
Vol 91 (5) ◽  
pp. 627-643 ◽  
Author(s):  
Yongsheng Ma ◽  
Xusheng Guo ◽  
Tonglou Guo ◽  
Rui Huang ◽  
Xunyu Cai ◽  
...  
Keyword(s):  
Sichuan Basin ◽  
Southwest China ◽  
Gas Field ◽  
Puguang Gas Field
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