Depositional Model of Lowstand and Characteristics of Sequence Boundary in Deep-water Lake, Songliao Depression Basin

XIN Ren-chen; CAI Xi-yuan; WANGYing-min

During the depositional stage of Cretaceous Qingshankou, Yaojia and Nenjiang Formation, Songliao basin was a depression lake with deep-water, the slope of the basin was gentle along the long-axis, and was steep along the short-axis. The migration of depositional facies is characteristics of the third-order sequence boundary in gentle slope, but the onlap and truncation in seismic profile is not clear. In the steep slope, the third-order sequence boundary displayed as migration of depositional facies, but the onlap and truncation in seismic profile is very clear. The LST, TST and HST can be recognized in the third-order sequence. Along the long-axis, the distributary channel of delta developed very well, but mouth-bar, distal-bar and lake-floor-fan sediments are thin. Along the short-axis, mouth-bar, distal-bar and lake-floor-fan sediments developed in order along the lake-direction, but lack of the sediments from distributary channel of delta.

1. Institute of Marine Geology and Geophysics, China University of Geoscience,Beijing 100083;

2. Ministry of Education Key Laboratory for Hydrocarbon Accumulation, Petroleum University, Changping Beijing 102249;

3. Headquarter of Prospect for Oil and Gas of Western New Developed Area, SINOPEC. Urumqi 830000

Received Date: 2003-07-15

Rev Recd Date: 2003-09-04

Publish Date: 2004-09-10

Key words:

framework of sequence stratigraphy /
lowstand system tract /
depositional model /
depression deep-wa 2 ter lacustrine basin /
Songliao basin

Abstract: During the depositional stage of Cretaceous Qingshankou, Yaojia and Nenjiang Formation, Songliao basin was a depression lake with deep-water, the slope of the basin was gentle along the long-axis, and was steep along the short-axis. The migration of depositional facies is characteristics of the third-order sequence boundary in gentle slope, but the onlap and truncation in seismic profile is not clear. In the steep slope, the third-order sequence boundary displayed as migration of depositional facies, but the onlap and truncation in seismic profile is very clear. The LST, TST and HST can be recognized in the third-order sequence. Along the long-axis, the distributary channel of delta developed very well, but mouth-bar, distal-bar and lake-floor-fan sediments are thin. Along the short-axis, mouth-bar, distal-bar and lake-floor-fan sediments developed in order along the lake-direction, but lack of the sediments from distributary channel of delta.

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Depositional Model of Lowstand and Characteristics of Sequence Boundary in Deep-water Lake, Songliao Depression Basin

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