Geochemical Characteristics of Lower Carboniferous Nanmingshui Formation Source Rockand Their Geologic Implications, Qiakuerte Prairie, Northeastern Junggar Basin
Received date: 2008-08-31
Revised date: 2008-09-22
Online published: 2008-12-10
The distribution of Carboniferous source rock in eastern Junggar basin is extensive. Presently, commercial natural gas reservoirs are mainly derived from Carboniferous mudstones in Wucaiwan depression and Dishuiquan fault belts. According to the conventional geochemical analysis of Lower Carboniferous Nanmingshui Formation field mudstone samples in north Qiakuerte prairie of northeastern Junggar basin, the geochemical characteristics were examined including hydrocarbon generation potential, depositional environment, organic matter input and maturation. The organic matter content of partial samples is high, and its vitrinite reflectance is beyond 1.5%, which reflect the high maturity of the organic matter, and the type of the organic matter is the third kind of kerogen. Based on nalkanes, isoprenoids and gammaceranes, the organic matter of mudstone is formed in anoxic and slightly saline or fresh water. Combined with the characteristics of tepanes’ and steranes’ biomarkers, it is suggested that the organic matter is originated from the higher plant, and also algaes input possibly. And therefore the relative abundances of Aromatic hydrocarbons such as chrysene, phenanthrene, retene, fluoranthene, benzo pyene, benzofluoranthene and dibenzothiophene are higher. The isotope values of kerogen and group compositions from core extracts of Nanmingshui Formation mudstones also demonstrate above mentioned views. In the Carboniferous Period, the sedimentary facies of Junggar basin changed from south to north, which was deposited in marine en vironment in south, but in north it was prodelta and shoreside or shallow lacustrine facies, locally swamp deposit. Carboniferous source rocks generate natural gas and have a great significance of petroleum geology.
QIN Li-ming ;ZHANG Zhi-huan ;LIU Hong-jun,; MENG Xian-long . Geochemical Characteristics of Lower Carboniferous Nanmingshui Formation Source Rockand Their Geologic Implications, Qiakuerte Prairie, Northeastern Junggar Basin[J]. Natural Gas Geoscience, 2008 , 19(06) : 761 -769 . DOI: 10.11764/j.issn.1672-1926.2008.06.761
［1］石昕,王绪龙,张霞,等.准噶尔盆地石炭系烃源岩分布及地球化学特征［J］.中国石油勘探,2005,(1): 34-39.
［2］王绪龙,康素芳.准噶尔盆地腹部及西北缘斜坡区原有成因分析［J］.新疆石油地质,1999,20(2): 108-112.
［3］徐兴友.准噶尔盆地东部克拉美丽地区石炭系烃源岩研究［J］.油气地质与采收率,2005,12(1): 38-41.
［4］贾进斗.准噶尔盆地天然气藏地质特征及分布规律［J］.天然气地球科学,2005,16(4): 449-455.
［5］张顺存,王凌,石新璞,等.准噶尔盆地腹部陆西地区石炭系火山岩储层的物性特征及其与电性的关系［J］.天然气地球科学,2008,19(2): 198-203.
［6］张枝焕,杨藩,李东明,等.中国新生界咸水湖相烃源岩和原油生物标志物组合特征［J］.沉积学报,1998,16(3): 119-131.
［7］张枝焕,杨藩,李东明,等.中国新生界咸化湖相有机地球化学研究进展［J］.地球科学进展,2000,15(1): 65-70.
［8］Ourisson G,Albrecht P,Rohmer K.Prokaryotic hopanoids and other polyterpenoid sterol surrogates ［J］.Annual Review of Microbilogy,1987,41: 301-333.
［9］Volkman J K,Banks M R,Denwer K,et al.Biomarker composition and depositional setting Tasmanite oil shale from northern Tasmania[C]//14th International Meeting on Organic Geochemistry.Paris,1989:168.
［10］Azevedo D A,Aquino Neto F R,Simoneit B R T.Novel series of tricyclic aromatic terpanes characterized in Tasmanian tasmanite［J］.Organic geochemistry,1992,18(1): 9-16.
［11］Simoneit B R T,Schoell M,Dias R F,et al.Unusual carbon isotope compositions of biomarker hydrocarbons in a Permian tasmanite［J］.Geochimica et Cosmochimica Acta,1993,57(17): 4205-4211.
［12］Aquino Neto F R,Triguis J,Azevedo D A,et al.Organic geochemistry of geographically unrelated Tasmanites［C］//14th Intenational Meeting on Organic Geochemistry.Paris,1989:189.
［13］Peters K E,Moldowan J M,Sundararaman P.Effects of hydrous pyrolysis on biomarker thermal maturity parameters: Monterey Phosphatic and Siliceous members ［J］.Organic geochemistry,1990,15(3): 249-265.
［14］王屿涛,丁安娜,惠荣耀.准噶尔盆地西北缘二叠系稠油地化特征及成因探讨［J］.石油实验地质,1997,19(2): 158-163.
［15］王绪龙,康素芳.准噶尔盆地西北缘玛北油田油源分析［J］.西南石油学院学报,2001,23(6): 6-8.
［16］Moldowan J M,Seifert W K,Gallegos E J.Relationship between petroleum composition and depositional environment of petroleum source rocks ［J］.AAPG Bulletin,1985,69: 1255-1268.
［17］Peters K E,Walters C C,Moldowan J M.The Biomarker Guide: Biomarkers and Isotopes in Petroleum and Earth History ［M］.Cambridge:Cambridge University Press,2005.
［18］王大锐.油气稳定同位素地球化学［M］.北京: 石油工业出版社,2000.
/
| 〈 |
|
〉 |
甘公网安备 62010202000678号