Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《Earth Science-Journal of China University of Geosciences》 2004-04
Add to Favorite Get Latest Update

Geochemical Evidences of Hydrocarbon Expulsion Threshold and Its Application

PANG Xiong-qi~(1,2), LI Su-mei~(1,2), JIN Zhi-jun~2, LI Mao-wen~(1,3)1.Key Laboratory for Hydrocarbon Accumulation Mechanism, University of Petroleum, Ministry of Education, Beijing102249, China 2.Basin & Reservoir Research Center, University of Petroleum, Beijing102249, China 3.Geological Survey of Canada, Calgary  
The concept of "Hydrocarbon expulsion threshold" is taken as an important theoretical base in the identification of effective source rock, and therefore, plays a significant role in petroleum exploration and resource assessment. Occurrence of hydrocarbon expulsion threshold is discussed by means of geochemical approaches. The results show that the parameters of (S_1+S_2)/TOC, HI showing source rock potential and the abundance of resident hydrocarbons-"A" decrease obviously with increasing depth once source rocks reach the expulsion threshold, and obvious variation of chemical composition as well as (abundance) and relative distribution of biomarkers can also be observed. Similar chemical compositions between crude oils and soluble organic matters are observed after the source rocks entered the expulsion threshold, however, the discrepancies are present within the source rocks below the expulsion threshold. Taking as an example of the Dongying depression of the Bohaiwan basin, the expulsion thresholds of Es~4 mudstone and shale in Bamianhe area are about 2 200 and 2 000 m respectively, with expulsion intensity of 0-1 100 and 0-150 kg/m~2 and expulsed accumulative hydrocarbons of 7.365×10~8 and 1.435×10~8 t.
【Fund】: 国家重点基础研究发展规划项目 (G199943 3 10 ) ;; 国家“十五”攻关课题 ( 2 0 0 1BA60 5A0 9) .
【CateGory Index】: P618.130
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved