Occurrence types and genesis of anhydrite from the Ma56 submember of Ordovician Majiagou Formation in central and eastern Ordos Basin
Deng Wei1,2, Tan Xiu-Cheng1,2, Zhang Dao-Feng3, Zhong Shou-Kang1,2, Dong Guo-Dong3, Xiao Di1,2, Lu Zi-Xing3, Yang Meng-Ying1,2, Xiong Ying1,2, Nie Wan-Cai4
1 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China; 2 Research Branch of Southwest Petroleum University Key Laboratory of Carbonate Reservoirs,CNPC,Chengdu 610500,China; 3 Research Institute of Exploration and Development,Changqing Oilfield Company of PetroChina,Xi'an 710021,China; 4 Yihuang Natural Gas Project Department,Changqing Oilfield Company of PetroChina,Yan'an 716000,China
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.
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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