--> --> Abstract: Expelling of Hydrocarbon in Undercompacted Oil--Source Rocks, by G. Zhou and F. Chen; #90984 (1994).

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Abstract: Expelling of Hydrocarbon in Undercompacted Oil--Source Rocks

Guojun Zhou, Fajing Chen

The clay of source rocks below a certain depth is generally undercompacted. Historical analysis of undercompacted EK2 mudstone in the Huang Hua depression, North China basin, has shown that the peak of the undercompacted zone decreases under a certain depth, mainly due to development of a microfracture caused by abnormally high pressure. Based on the compaction history of mudstones and the hydraulic fracturing condition in this area, the depth of the microfracture developed in the EK2 undercompacted zone is calculated at 2900 m, which is also verified by fluorescence data. Geochemical evidences have also shown that many hydrocarbons are expelled under 2900 m.

AAPG Search and Discovery Article #90984©1994 AAPG Annual Convention, East Lansing, Michigan, September 18-20, 1994