Hydrocarbon Accumulation Characteristic in Sequence Stratigraphy
Framework of Western Slop Area，Southern Songliao Basin

doi:10.11885/j.issn.1674-5086.2015.01.07.07

Abstract

Abstract:

The fourth member of Quantou Formation to the first member of Nenjiang Formation in south Songliao Basin can be
divided into six third-order sequences and eighteen system tracts. The analysis of hydrocarbon accumulation factors，including
source rock，reservoir，cap rock，trap type and oil migration，reveals that the hydrocarbon are mainly from central depression
source rock and has high thickness and abundance. The sedimentary facies of reservoir is the braided river deltas front. The
sandstone is of high thickness，good property，and middle-high porosity and permeability. The widely developed mudstone
（SQn1）is the regional cap formation. Structural trap，combination trap and stratigraphic- lithologic trap are major trap types in
western slop area. There are migration transition belts，and hydrocarbon migrated in lateral style in the western area of transition
belt，but migrated in ladder style in the eastern area of transition belt. Based on those accumulation characteristics，western
slope area was divided into three favorable accumulation plays. Their accumulation pattern are“near source，vertical migration
of fault，ladder type reservoir”in SQy braided river deltas front and SQqn3 slope-break belt，and“far source for hydrocarbon，
lateral migration of sand body，effective trap reservoir”in SQy basin edge overlap zone.

Key words: sequence stratigraphy framework, accumulation factors, hydrocarbon migration transition belt, accumulation
pattern, western slop area, south Songliao Basin

Dong Yanlei1, Zhu Xiaomin1*, Cheng Kenan2, Yang Haifeng3. Hydrocarbon Accumulation Characteristic in Sequence Stratigraphy
Framework of Western Slop Area，Southern Songliao Basin[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2015.01.07.07.

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