Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (3): 1-12.doi: 10.12108/yxyqc.20210301

• PETROLEUM GEOLOGY •     Next Articles

Seismic reflection and sedimentary characteristics of deep-water gravity flow channels on the slope of lacustrine depression basin: First member of Nenjiang Formation in LHP area, Songliao Basin

LIU Huaqing, FENG Ming, GUO Jingyi, PAN Shuxin, LI Hailiang, HONG Zhong, LIANG Sujuan, LIU Caiyan, XU Yunze   

  1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest, Lanzhou 730020, China
  • Received:2020-07-01 Revised:2020-09-20 Published:2021-06-03

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Abstract: Multiple deep-water slope channels have been observed within the lacustrine Songliao Basin， northeastern China. To understandthe spatial-temporal evolution and internal structures of these channels，techniques including 90° phase rotation，stratal slicing，opacity stacks and illumination were used to study the seismic characteristics and internal structure of gravity flow channels developed on the deep-water slope of lacustrine basin of Lower Cretaceous Nen 1 member in LHP area. The results show that： （1）Nine channels within the 50 km2 LHP area were developed in Nen 1 member of the Late Cretaceous Nenjiang Formation. The depositional setting was a sublacustrine slope characterized by a gradient of 0.5‰ - 1.0‰.（2） Based on morphology，the channels were grouped into two channel systems based on size and degree of associated erosion：small meandering channels characterized by sinuosity of 1.03-1.17，which developed early and were commonly less than 40 m wide. Erosional confinement was minimal and distal avulsions were common. These channels can be described as relatively unconfined，lying down-slope of large gravity-flow systems.（3）Larger meandering channels with sinuosity of 1.04-1.45 and widths up to 500 m，were characterized by greater erosion with maximum erosional valley relief of 20 m. These channels were sufficiently large so that cross profiles could be evaluated，revealing U/V shaped section morphology. Avulsions were uncommon and levees were observed locally. These channels likely lie within the central part of associated gravity-flow systems.（4）Morphological statistics suggest that channel slope and sinuosity，depth and width are positively correlated.（5）Well data from neighboring area indicate that the channel fills were characterized by predominantly silt/fine sandstones with thickness of 10-20 m. These reservoir-prone deposits were bracketed in good quality source rocks making them favorable hydrocarbon exploration targets.（6）The Late Cretaceous global anoxic event possibly caused the abnormal climate（frequent flooding events）and then the frequent gravity flows in the Nen 1 member of lacustrine basin. The continuous subsidence increased the gradient of the paleo-lake and subsequently caused the geomorphology difference between the channels A-D and E-I.

Key words: sublacustrine slope, gravity flow channels, seismic sedimentology, seismic geomorphology, channel structure parameters, Nenjiang Formation, Songliao Basin

CLC Number: 

  • TE121.3
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