辽西低凸起中南段古近系东营组层序地层及地层-岩性油气藏勘探意义

doi:10.11743/ogg20120211

Abstract

Abstract:

The control of palaeotopography on the distribution of sandbodies has been well studied in continental rifted basin,while the control of palaeotopography dynamic changes caused by syndepositional structure movement on the sand distribution is less studied.Through the systematic study of tectonic-sequence stratigraphy and sedimentary facies of the Paleogene Dongying Formation in the central-south Liaoxi salient,the LST,TST and HST are recognized in the 2^nd member of the Dongying Formation according to system tract boundaries and the seismic reflection features of deltas.A high resolution sequence stratigraphy framework is established.On the basis of the fine division and correlation of sequence stratigraphy unit,the paper studied the palaeotopography and the development and evolution of depositional system.The study reveals that braided river delta,meandering river delta,sublacustrine fan and lake are well developed in the study area.There are three transform belts along the boundary fault in the salient from north to south.The areal and spatial variation of activity of the transform belts is the key factor controlling the migration of delta lobes.Four types of stratigraphic-lithologic traps,including fault-lithologic trap,sandstone updip pinchout trap,lithologic trap and stratigraphic overlap trap,are recognized in the 2^nd member of the Dongying Formation based on the sandbody characterization of each system tract.

Key words: depositional system, sequence stratigraphy, stratigraphic-lithologic trap, Liaoxi salient

CLC Number:

TE122

Guo Tao, Wang Jun, Shi Wenlong, Zheng Jinggui, Wang Baoquan, Xu Chunqiang. Sequence stratigraphy of the Paleogene Dongying Formation and its significance for stratigraphic-lithologic reservoirs exploration in the central-south Liaoxi salient[J]. Oil & Gas Geology, 2012, 33(2): 248-255,264.

References

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Sequence stratigraphy of the Paleogene Dongying Formation and its significance for stratigraphic-lithologic reservoirs exploration in the central-south Liaoxi salient

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