Identification of Genetic Types of Natural Gases Produced from Deep Sag in Dongying Depression
详细信息
- 责任者：Jin Qiang (School of Geosciences ; China University of Petroleum ; Qingdao 266580 ; China) ; Wang Li
- 刊名：Journal of China University of Petroleum
- 出版年：2013
- 卷期：37(1)
- 关键词：天然气成因 ; natural gas origin ; 东营凹陷 ; Dongying Sag
- 页码：p.13-18
- 图表：illus., 2 tables, 18 refs.
- 分类号：1003
- issnNo：ISSN1673-5005
- isbnNo：CN37-1441/TE
摘要
A series of high-production natural gases have been discovered in deep sag of the northern Dongying depression in recent years,which is a great breakthrough in the oil-rich basin.It comes a debate among the geological explorers about the gas origins whether the gas is the thermal degradative gas from source rocks or the cracking gas from oil.The authors investigated on the geology and geochemistry of natural gases discovered in the Minfeng area,a typical gas accumulation area in the deep sag of the northern Dongying depression,especially conducted thermal simulations on gas generations from either source rock or oil,and found useful identification parameters on the two genetic types of the natural gases.For the source-rock-degradative gas,the ratio of ln(CC5/nC6) <-1,(MCC5+CC6)/nC6< 0.8,(CC5+MCC5+CC6)/(nC5+nC6) < 0.5,DMCC5/CC5> 0.6 and ratio of toluere/benzene is greater than 1.1.For oil-cracking gas,all the ratios are in opposing numbers.The results conclude that the natural gases discovered from the Minfeng area are mainly source-rock-degraded gas and subordinately oil-cracking gas.
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