鄂尔多斯盆地中东部奥陶系马家沟组马五<sub>6</sub>亚段硬石膏产状类型与成因<sup>*</sup>

doi:10.7605/gdlxb.2022.02.019

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Abstract There are diverse anhydrite in Ma5₆ submember of Ordovician Majiagou Formation in central and eastern Ordos Basin. Based on systematic macroscopic and microscopic petrography analysis,different types of anhydrite were identified and distinguished,such as scattered(A1),laminar(A2),dense massive(A3),nodular or clumpy(A4),squiggly or brecciated(A5).The analysis of high frequency cycles and microfacies of a single well showed that five kinds of high-frequency,shallowing-upward sequences were developed in the Ma5₆ submember,which are respectively related to tidal flat,lagoon,oolitic shoal,Fragmental shoal and microbial mound. It was found that the occurrence type,production position and distribution form of the anhydrite had a good coupling relationship with the shallower sequences.Type A1 and A2 anhydrite occur in the lower and middle part of the high-frequency,shallowing-upward sequence,which is mainly related to the dolomite lagoon or gypsum lagoon,and belongs to the primary chemical sedimentary origin of the lagoon facies. The A3 type anhydrite is distributed in the upper part of the high-frequency,shallowing-upward sequence,which is controlled by the gypsum lagoon,and also belongs to primary chemical sedimentary origin. The classic nodular anhydrite(A4-1)occurs in tidal flat sedimentary sequence in a random distribution form,and is caused by diagenetic metasomatism or gypsification,which is similar to the traditional sabha metasomatism gypsum nodules.A4-2 anhydrite mainly occurs in grainstone and microbialite,and is mainly formed by precipitation of CaSO₄-rich subsurface brine in dissolution pore and small caves.A5 type anhydrite occurs at the upper and top of the shallowing-upward sequence,which is related to high frequency exposure and is caused by karst transformation of dissolution and filling in the syngenetic period.A fully developed single high-frequency cycle has roughly experienced four evolutionary stages: early high-frequency rapid transgression,late high-frequency rapid transgression to early slow regression,late high-frequency slow regression,and exposure at the end of high-frequency regression,which formed a coupled marine carbonate and anhydrite co-occurrence sequence. These understandings will have important referential significance for the re-understanding of the sedimentary paleoenvironment during the deposition of the Majiagou Formation.

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	Articles by authors
	Deng Wei
	Tan Xiu-Cheng
	Zhang Dao-Feng
	Zhong Shou-Kang
	Dong Guo-Dong
	Xiao Di
	Lu Zi-Xing
	Yang Meng-Ying
	Xiong Ying
	Nie Wan-Cai

Key words： anhydrite occurrence types shallowing-upward sequence Ma5₆ submember Ordos Basin

Received: 12 August 2021

ZTFLH:

P588.2

Fund:China National Petroleum Corporation upstream field basic forward-looking project(No.2021DJ0501)

Corresponding Authors: Tan Xiu-Cheng,born in 1970,professor and Ph.D. advisor,is mainly engaged in sedimentology and reservoir geology. E-mail: tanxiucheng70@163.com。

About author: Deng Wei,born in 1996,master degree candidate,is mainly engaged in reservoir geology. E-mail: weideng104122@163.com。

Cite this article:

Deng Wei,Tan Xiu-Cheng,Zhang Dao-Feng et al. Occurrence types and genesis of anhydrite from the Ma5₆ submember of Ordovician Majiagou Formation in central and eastern Ordos Basin[J]. JOPC, 2022, 24(2): 226-244.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2022.02.019 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2022/V24/I2/226

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