Source Rocks for the Giant Puguang Gas Field, Sichuan Basin: Implication for Pet

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Source Rocks for the Giant Puguang Gas Field, Sichuan Basin: Implication for Petroleum Exploration in Marine Sequences in South China

Detailed geochemistry studies were conducted to investigate the origin of solid bitumens and hydrocarbon gases in the giant Puguang gas field. Two types of solid bitumens were recognized: low sulfur content, low reflectance (LSLR) solid bitumens in sandstone reservoirs in the Xujiahe Formation and high sulfur content, high reflectance (HSHR) solid bitumens in the carbonate reservoirs in the Lower Triassic Feixianguan and Upper Permian Changxing formations. Solid bitumens in the Upper Triassic Xujiahe Formation correlate well with extracts from the Upper Triassic to Jurassic nonmarine source rocks in isotopic composition of the saturated and aromatic fractions and biomarker distribution. Solid bitumens in the Feixianguan and Changxing formations are distinctly different from extracts from the Cambrian and Silurian rocks but display reasonable correlation with extracts from the Upper Permian source rocks both in isotopic composition of the saturated and aromatic fractions and in biomarker distribution, suggesting that the Permian especially the Upper Permian Longtan Formation was the main source of solid bitumens in the carbonate reservoirs in the Feixianguan and Changxing formations in the Puguang gas field. Chemical and isotopic composition of natural gases indicates that the majority of hydrocarbon gases originated from sapropelic organic matter and was the products of thermal cracking of accumulated oils. This study indicates that source rock dominated by sapropelic organic matter existed in the Upper Permian and had made major contribution to the giant Puguang gas field, which has important implication for petroleum exploration in marine sequences in South China.水利论文3v'],c |)E2xo4WK

作 者: ZOU Huayao HAO Fang ZHU Yangming GUO Tonglou CAI Xunyu LI Pingping ZHANG Xuefeng  
作者单位:ZOU Huayao,HAO Fang,LI Pingping,ZHANG Xuefeng(State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum,Changping, Beijing 102249, China)
*_#e n'[y2yD@0ZHU Yangming,GUO Tonglou(Department of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang 310027, China)
\a&o Ck+V#D#a8k^D7A+r0CAI Xunyu(Southern Exploration and Development Company, Sinopec, Kunming, Yunnan 650023, China) 
刊 名:地质学报(英文版)  SCI
英文刊名:ACTA GEOLOGICA SINICA 
年,卷(期):2008 82(3) 
分类号:P5 
关键词:reservoir bitumen   oil-cracking   origin of origin and natural gas   Puguang gas field  
机标关键词:Gas FieldSouth Chinaisotopic compositionsulfur contentorganic mattergas fieldsource rockspetroleum explorationsandstone reservoirsthermal crackingLower Triassic 
基金项目:国家重点基础研究发展计划(973计划),PCSIRT 
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