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Sedimentary characteristics and model of gravity flow channel-lobe complex in a depression lake basin:A case study of Chang 7 Member of Triassic Yanchang Formation in southwestern Ordos Basin,NW China

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Petroleum Exploration and Development 2022年第6期49卷 1323-1338页

作者： LYU Qiqi FU Jinhua LUO Shunshe LI Shixiang ZHOU Xinping PU Yuxin YAN Hongguo School of Geosciences Yangtze UniversityWuhan 430100China National Engineering Laboratory for Exploration and Development of Low Permeability Oil&Gas Fields Xi’an 710018China Exploration and Development Research Institute of Changqing Oilfield Branch Company Ltd. PetroChinaXi’an 710018China

To reveal the development characteristics and distribution of gravity flow sedimentary system under micro-paleogeomorphologic units of the Chang 7 Member of Triassic Yanchang Formation in the southwestern Ordos Basin,on the basis of the restoration of the paleogeomorphological form of the Chang 7 depositional period by the impression method,each micro-paleogeomorphologic unit was depicted in-depth,and the characteristics and development models of gravity flow deposits in the study area were studied in combination with outcrop,core,mud logging and log data.The results show that:(1)The paleogeomorphology in the Chang 7 depositional period was an asymmetrical depression,wide and gentle in the northeast and steep and narrow in the southwest.Three sub-paleogeomorphologic units were developed in the basin,including gentle paleo-slope,paleo-slope and paleo-depression,and they can be further subdivided into eight micro-paleogeomorphologic units:bulge,groove,slope break belt,plain of lake bottom,deep depression of lake bottom,paleo-channel,paleo-ridge of lake bottom,and paleo-uplift of lake bottom.(2)There are 9 types of lithofacies and 4 types of lithofacies assemblages of Chang 7 Member.According to lithofacies composition and lithofacies vertical combination,the gravity flow deposit is further divided into 5 types of microfacies:restricted channel,unrestricted channel,natural levee,inter-channel,lobe.(3)Paleogeomorphology plays an important role in controlling sediment source direction,type and spatial distribution of sedimentary microfacies,genetic types and distribution of sand bodies in Chang 7 Member.

关键词： gravity flow deposit slope break belt paleogeomorphology channel-lobe complex Triassic Yanchang Formation Ordos Basin depression lake basin

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depositional Characteristics of Lake-Floor Fan of Cretaceous Lower Yaojia Formation in Western Part of Central Depression Region,Songliao Basin

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Journal of China University of Geosciences 2009年第4期20卷 731-745页

作者：辛仁臣李桂范冯志强梁江平林畅松 School of Ocean Sciences China University of Geosciences School of the Earth Sciences and Resources China University of Geosciences Daqing Oilfield Company PetroChina School of Energy Resources China University of Geosciences

ABSTRACT： Based on the integrated subsurface data, including those of over 600 m drilled cores, more than 30 drilled wells and 600 km^2 three-dimensional （3D） seismic-reflection data of the study area, the characteristics of the lake-floor fan of lower Yaojia （姚家） Formation have been clarified. An evident lacustrine slope break and a steep slope belt developed in the west of Songliao （松辽） basin during depositional period of Qingshankou （青山口）-Yaojia formations （K2）. The slope gradient was about 15 m/kin. During the depositional period of lower Yaojia Formation, the lake shrank and the shore line of the western Songiiao basin shifted to the lacustrine slope-break. The wedge-shaped sediment body, which is interpreted as the lowstand system tract of SQyl （LSTy1）, developed in the area below the slope-break. The LSTy1 is pinched out in the west of the study area. As to the thickness of LSTy1, it is thicker in the east with 50 m in its thickness than in the west. The LSTy1, rich in sandstone, can be divided into lower part LSTy1L and upper part LSTy1u based on two onlap seismic reflection phases, and core and logging data clearly. The various sediments＇ gravity flow deposits developed and the complex of lake-floor fan formed in the LSTy1 under the slope-break in the western part of the central depression region. The lake-floor fan consists of various sediments＇ gravity flow deposits, including：（1） turbidity deposits with characteristics of Bouma sequences; （2） sand-bearing muddy debrite dominated by mud and mixed by sand; （3） mud-bearing sandy debrites characterized by dominated sand and mixed by mud; （4） sandy debris laminar flow deposits with massive or inclined bedding, and （5） sandy slump deposits developed as deformational sedimentary structure. During the lower lake-level period （LSTy1L）, the western clino-form region was erosion or sediment pass-by area; the terrigenous clasttc was directly trans-ported to deep-water area, converted to channelized sandy debris flow, and combined with slump derived gravity flow

关键词： lacustrine slope-break gravity flow deposit lake-floor fan Cretaceous Songliao basin

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