--> Abstract: Fault Sealing for Hydrocarbon Migration and Entrapment: Concept, Characterization and Effect in Migration, by X. Luo, L. Zhang, G. Song, F. Sui, G. Qiu, C. Song, and J. Zhao; #90091 (2009)
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Previous HitFaultNext Hit Sealing for Hydrocarbon Previous HitMigrationNext Hit and Entrapment：Concept, Characterization and Previous HitEffectNext Hit in Previous HitMigrationNext Hit

Xiaorong Luo1, Likuan Zhang1, Guoqi Song2, Fenggui Sui2, Guiqiang Qiu2, Chengpen Song1, and Jian Zhao1
1Key Laboratory of Gas Geochemistry, Institute of Geology & Geophysics, Chinese Academy of Sciences, Beijing, China
2Institute of Exploration and Development, Shengli Oilfield Company, SinoPec, Dongying Shandong, China

Previous HitFaultNext Hit plane is, in fact, not a simple surface, but a belt consisting of Previous HitfaultNext Hit gouge, Previous HitfaultNext Hit damaged zone, Previous HitfaultNext Hit deriving fractures and failures. For the aim of hydrocarbon Previous HitmigrationNext Hit, the sealing characteristics during movements of a Previous HitfaultNext Hit should, therefore, be considered as a geological phenomenon, instead of a physical one, by taking all the sealing/opening activities, that happened in a geological period of hydrocarbon Previous HitmigrationNext Hit and accumulation, into account.

The Wangjiagang Previous HitfaultNext Hit zones lying on the southern slope of the Dongying Sag in Bohai Bar Basin were selected as studying area. Through statistic multi-analysis, three factors are considered to be critical to Previous HitfaultNext Hit sealability: pore pressure (P) in shale, shale gouge ratio (SGR) in the vicinity of faults, and normal stress (s) on Previous HitfaultNext Hit plane. To conclude the integrative effects of these factors, a Previous HitfaultNext Hit opening coefficient (FOC) is defined as directly proportional to P and inversely to s and SGR. By dividing a Previous HitfaultNext Hit plane into small zones, the value of FOC can be calculated, and the sealability of Previous HitfaultNext Hit at one zone (as indicated by sealing probability, Ps) is identified by checking if oil was found or not in the reservoirs over one zone.

Some relationships between FOC and Ps during Previous HitmigrationNext Hit seem to exist in our field case study in the Bohai Bar Basin, China: Ps tends to be 1 when FOC is smaller than 1; a power relationship exists between FOC and Ps when FOC is between 1 and 3.5; and Ps tends to be 0 when FOC is larger than 3.5. The relationships suggest that faults varied its behaviors (open or close) during hydrocarbon Previous HitmigrationTop in different time and locations.

 

AAPG Search and Discovery Article #90091©2009 AAPG Hedberg Research Conference, May 3-7, 2009 - Napa, California, U.S.A.