OUYANG ZHENGJIAN, FENG JUANPING, YAO WEIZHUO, et al. Study on sedimentary characteristics of Middle Ordovician Keliomori Formation in western Ordos Basin. [J]. Journal of northwest university (natural science edition), 2024, 54(6): 1004-1012.
DOI:
OUYANG ZHENGJIAN, FENG JUANPING, YAO WEIZHUO, et al. Study on sedimentary characteristics of Middle Ordovician Keliomori Formation in western Ordos Basin. [J]. Journal of northwest university (natural science edition), 2024, 54(6): 1004-1012. DOI: 10.16152/j.cnki.xdxbzr.2024-06-006.
Study on sedimentary characteristics of Middle Ordovician Keliomori Formation in western Ordos Basin
The Lower Paleozoic Ordovician system in the western Ordos Basin has attracted much attention because of its great potential for oil and gas exploration
and the carbonate rock developed in the Middle Ordovician Keliomori Formation is expected to be the next exploration target layer
so study on its sedimentary characteristics can provide geological basis for the exploration of Ordovician gas in the west margin. By means of outcrops investigation
core observation and thin section identification
the characteristics of petrology
sedimentary facies types and spatial distribution of the Keliomori Formation are studied. It is shown that the Keliomori Formation is mainly composed of thin layer micrite
calcirudyte
calcarenite
calcisiltite
bioclastic limestone and black shale. They have micrite structure
granular structure
and thin layer
lamellar
nodular
brecciform structure
slump and Bauma sequence can be seen. The sedimentary facies platform front slope and deep water slop-trough
which are distributed in a narrow strip along the north-south direction. From east to west
the platform front slope facies develops in the open sea platform close to the Ordos base
and rapidly changes into deep water slop-trough facies westward
and the sea water has a gradual deepening trend.
关键词
鄂尔多斯盆地西部奥陶系克里摩里组沉积特征
Keywords
western Ordos BasinOrdovicianKeliomori Formationsedimentary characteristics
SUN Y S, ZHAO Z Y, GUO Y R, et al. Analyses of the sedimentary environments and reservoir characteristics for west margin of Ordos Basin[J]. Petroleum Geology and Oilfield Development in Daqing, 2015, 34(6): 34-38.
WU D X, ZHOU J G, WU X N, et al. Lithofacies and paleogeography of the Early-Middle Ordovician in the western Ordos Basin[J]. Geological Journal of Chinese Universities, 2018, 24(5): 747-760.
LI X D, CHEN H Y, CHEN H D. Deep-water combined-flow deposits of the Upper Ordovician Lashenzhong Formation in Zhuozishan Area, western margin of Ordos Basin[J]. Advances in Earth Science, 2019, 34(12): 1301-1315.
YU Z, ZHOU J G, LI C S, et al. Tectonic-lithofacies paleogeographic characteristics of Ordovician Kelimoli and Wulalike stages in the western edge of Ordos Basin[J]. Natural Gas Geoscience, 2021, 32(6): 816-825.
OUYANG Z J, CHEN H D, FENG J P. The structural characters and evolution of the mid-south section of the Ordos Basin’s west margin[J]. Geoscience, 2012, 26(4): 691-695.
OUYANG Z J, FENG J P, GONG H S, et al. Structural characteristics and oil and gas exploration target optimization of Hengshanbu area in the north of western margin of Ordos Basin[J]. Chinese Journal of Geology, 2021, 56(1): 19-27.
FU S T, FU J H, XI S L, et al. Geological characteristics of Ordovician marine shale gas in the Ordos Basin and its prospects[J]. China Petroleum Exploration, 2021, 26(2): 33-44.
HUANG J P, ZHANG C L, TAN K J, et al. Formation conditions and exploration potential for marine shale gas from the Ordovician Wulalike Formation in the western Ordos Basin[J/OL]. Acta Sedimentologica Sinica, [2024-08-10].https://doi.org/10.14027/j.issn.1000-0550.2024.083https://doi.org/10.14027/j.issn.1000-0550.2024.083.
SHAO D B, BAO H P, WEI L B, et al. Tectonic palaeogeography evolution and sedimentary filling characteristics of the Ordovician in the Ordos Area[J]. Journal of Palaeogeoeraphy, 2019, 21(4): 537-556.
ZHANG Y S, XING E Y, WANG Z Z, et al. Evolution of lithofacies paleogeography in the Ordos Basin and its implication of potash formation[J]. Acta Geologica Sinica, 2015, 89(11): 1921-1935.
CAO J Z, FENG Q, ZHAO W, et al. Sequence stratigraphy of Ordovician strata in the south part of Ordos Area[J]. Acta Sedimentologica Sinica, 2011, 29(2): 286-292.
GUO Y R, ZHAO Z Y, FU J H, et al. Sequence lithofacies paleogeography of the Ordovician in Ordos Basin, China[J]. Acta Petrolei Sinica, 2012, 33(2): 95-109.
GUO Y R, ZHAO Z Y, XU W L, et al. Sequence stratigraphy of the Ordovician system in the Ordos Basin[J]. Acta Sedimentologica Sinica, 2014, 32(1): 44-60.
MEI Z C, LI W H. Depositional model of deep water carbonate gravity flows in the middle-upper Ordovician series in Fuping, Shanxi Province[J]. Acta Sedimentologica Sinica, 1986, 4(1): 34-42.
FU J H, WU X N, SUN L Y, et al. New understandings of the lithofacies paleogeography of the middle assemblage of Majiagou Fm in the Ordos Basin and its exploration significance[J]. Natural Gas Industry, 2017, 37(3): 9-16.
FU J H, ZHENG C B. Evolution between North China sea and Qilian sea of the Ordovician and the characteristics of lithofacies palaeogeography in Ordos Basin[J]. Journal of Palaeogeography, 2001, 3(4): 25-34.
LI W H, ZHANG Q, CHEN Q, et al. Sedimentary evolution of Early Paleozoic in Ordos Basin and its adjacent areas[J]. Journal of Northwest University (Natural Science Edition), 2020, 50(3): 456-479.