Abstract Studied on well cores of the 5th Member of Ordovician Majiagou Formation in the Ordos Basin,it reveals that the microbialites in the 2nd layer of $Ma^{4}_{5}$,the 2nd layer of $Ma^{2}_{5}$,the 4th layer of $Ma^{1}_{5}$ can be divided into three distinct types: wormlike thrombolite,bacterial netlike thormbolite and chamber-patches thrombolite. By comparing with formation conditions of the modern microbial carbonate in the hypersaline lakes in the Republic of Kiribati,it is inferred that (1)the studied thrombolites formed in hypersaline lakes with salinity of 60‰~149‰ as the relative sea level rose,and(2) the gypsum-bearing carbonates formed in the hypersaline lakes with salinity of above 149‰. The wormlike thrombolites have high contents of intercrystaline pores and dissolution pores,and the netlike and chamber-patches thrombolites have high contents of relict pores, which makes thrombolites as an important exploration target.
Corresponding Authors:
Jiang Hong-Xia,born in 1976,research assistant,is a supervisor of master degree candidate of paleontology and stratigraphy. Her researches focus on carbonate paleontology,reefs and microbialites,paleoecology and chemostratigraphy. E-mail: jianghx@hgu.edu.cn.
About author: Qiao Ya-Bin,born in 1975,senior engineer of gas field development,chief geologist of Gas Production Plant 5 of PetroChina Changqing Oilfield Company. He works on gas field development technical management. E-mail: qyb_cq@petroChina.com.cn.
Cite this article:
Qiao Ya-Bin,Zhang Lin,Wang Yu et al. Thrombolite types and seawater palaeosalinity of the 5th Member of Middle Ordovician Majiagou Formation in Sulige Gas Field,Ordos Basin[J]. JOPC, 2020, 22(1): 97-110.
Qiao Ya-Bin,Zhang Lin,Wang Yu et al. Thrombolite types and seawater palaeosalinity of the 5th Member of Middle Ordovician Majiagou Formation in Sulige Gas Field,Ordos Basin[J]. JOPC, 2020, 22(1): 97-110.
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