Lithologic Reservoirs ›› 2013, Vol. 25 ›› Issue (6): 1-7.doi: 10.3969/j.issn.1673-8926.2013.06.001

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Unconformity types and their constraints on hydrocarbon behavior

GAO Changhai1, PENG Pu2, LI Benqiong2   

  1. 1. School of Geosciences, China University of Petroleum, Qingdao 266580, China; 2. Hekou Oil Production Plant, Shengli Oilfield Branch, Sinopec, Dongying 257200, China
  • Online:2013-11-26 Published:2013-11-26

Abstract:

Referring to the previous research achievements, guiding by theories of seismic stratigraphy and modern hydrocarbon accumulation, this paper put forward a new kind of unconformity type classification scheme on the basis of the profile morphology and the combination of seismic reflection end of two sides of the unconformity surface. In this scheme, the unconformity was divided into six kinds of types: parallel-fold type, parallel-truncation type, parallel parallel type, onlap-fold type, onlap-truncation type and onlap-parallel type. Among them, the upper part of parallel-fold type and parallel-truncation type are favorable for hydrocarbon migration, and the lower part are favorable for hydrocarbon accumulation; the upper or lower part of parallel-parallel type are favorable for hydrocarbon migration and favorable for hydrocarbon accumulation under the match of fault and fold; the upper or lower part of onlap-fold type and onlap-truncation type are most favorable for hydrocarbon accumulation; the upper part of onlap-parallel type are favorable for hydrocarbon accumulation, and the lower part are favorable for hydrocarbon migration. This classification scheme is more efficient and applicable because of considering unconformity as a whole and the relationship between unconformity and hydrocarbon accumulation, which will be favorable for stratigraphic reservoir exploration.

Key words: alluvial fan, sedimentarymicrofacies, retrogradation, Qie 16 well block, Kunbei Oilfield

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