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Formation Dynamics and Quantitative Prediction of Hydrocarbons of the Superpressure System in the Dongying Sag
Author(s) -
Fenggui SUI,
Xuefeng HAO,
Qing LIU,
Qin'gong ZHUO,
Shouchun ZHANG
Publication year - 2008
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.2008.tb00335.x
Subject(s) - hydrocarbon , petroleum engineering , geology , lithology , bearing (navigation) , fossil fuel , petrology , geotechnical engineering , chemistry , cartography , organic chemistry , geography
Based on the theory of formation dynamics of oil/gas pools, the Dongying sag can be divided into three dynamic systems regarding the accumulation of oil and gas: the superpressure closed system, the semi‐closed system and the normal pressure open system. Based on the analysis of genesis of superpressure in the superpressure closed system and the rule of hydrocarbon expulsion, it is found that hydrocarbon generation is related to superpressure, which is the main driving factor of hydrocarbon migration. Micro fractures formed by superpressure are the main channels for hydrocarbon migration. There are three dynamic patterns for hydrocarbon expulsion: free water drainage, hydrocarbon accumulation and drainage through micro fissures. In the superpressure closed system, the oil‐driving‐water process and oil/gas accumulation were completed in lithologic traps by way of such two dynamic patterns as episodic evolution of superpressure systems and episodic pressure release of faults. The oil‐bearing capacity of lithologic traps is intimately related to reservoir‐forming dynamic force. Quantitative evaluation of dynamic conditions for pool formation can effectively predict the oil‐bearing capability of traps.