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AAPG Bulletin


AAPG Bulletin, V. 95, No. 2 (February 2011), P. 241265.

Copyright copy2011. The American Association of Petroleum Geologists. All rights reserved.


Sequence stratigraphy, Previous HitseismicNext Hit sedimentology, and lithostratigraphic plays: Upper Cretaceous, Sifangtuozi area, southwest Songliao Basin, Previous HitChinaNext Hit

Wenzhi Zhao,1 Caineng Zou,2 Yingliu Chi,3 Hongliu Zeng4

1PetroChina Exploration and Production Company, Beijing 100011, Previous HitChinaNext Hit; [email protected]
2PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, Previous HitChinaNext Hit; [email protected]
3PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, Previous HitChinaNext Hit; [email protected]
4Bureau of Economic Geology, John A. and Katherine G. Jackson School of Geosciences, University of Texas at Austin, University Station, Box X, Austin, Texas 78713; [email protected]


Lithostratigraphic plays are one of the major targets for reserve growth in the nonmarine Songliao Basin, Previous HitChinaNext Hit. In this article, an integrated approach was adopted that applies principles and techniques of sequence stratigraphy and Previous HitseismicNext Hit sedimentology to the study of higher order sequences, depositional environments, and lithostratigraphic trapping styles. In the Sifangtuozi area, 20 higher order (fourth- or fifth-order) sequences in four third-order sequences were identified in an Upper Cretaceous interval using well and Previous HitseismicNext Hit Previous HitdataNext Hit. Core description and wireline log classification helped identify distributary channel fill, distributary mouth bar, sheet sand, distal bar, prodelta/shallow lake, and semideep to deep lake deposits in fluvial-dominated deltaic systems. In two three-dimensional (Previous Hit3-DNext Hit) Previous HitseismicNext Hit survey areas, Previous HitseismicNext Hit Previous HitinversionNext Hit and 90deg phasing of Previous HitseismicNext Hit Previous HitdataNext Hit converted Previous HitseismicNext Hit traces to pseudolithologic logs. Stratal slicing made it possible to interpolate and extrapolate well-Previous HitdataNext Hit–derived sequence and facies interpretation to whole Previous Hit3-DNext Hit Previous HitseismicNext Hit surveys and then make broader interpretations and predictions on sand content, sandstone thickness, and geomorphological information. Play analysis using sandstone isopach or amplitude stratal slices and superimposed Previous HitstructuralNext Hit maps identified potential accumulations in small Previous HitstructuralNext Hit, lithostratigraphic, and combination traps. These traps are all significantly controlled by lithology, reservoir distribution, sealing conditions, and closure.

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