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

被引：0
|
作者：
Lyu Q. [1 ]
Fu J. [2 ,3 ]
Luo S. [1 ]
Li S. [2 ,3 ]
Zhou X. [2 ,3 ]
Pu Y. [1 ]
Yan H. [1 ]
机构：
[1] School of Geosciences, Yangtze University, Wuhan
[2] National Engineering Laboratory for Exploration and Development of Low Permeability Oil＆Gas Fields, Xi’an
[3] Exploration and Development Research Institute of Changqing Oilfield Branch Company Ltd., PetroChina, Xi’an
来源：
Shiyou Kantan Yu Kaifa/Petroleum Exploration and Development | 2022年 / 49卷 / 06期
关键词：
channel-lobe complex; depression lake basin; gravity flow deposit; Ordos Basin; paleogeomorphology; slope break belt; Triassic Yanchang Formation;
D O I：
10.11698/PED.20220295
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
To reveal the development characteristics and distribution of gravity flow sedimentary system under micro-paleogeomorphic 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 sedimentary period by the impression method, each micro paleogeomorphology 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 sedimentary 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 ancient gentle 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. © 2022 Science Press. All rights reserved.
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页码：1143 / 1156
页数：13
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