Sedimentary characteristics and reservoir controlling effect of the Member 4 of Ordovician Majiagou Formation in Ordos Basin
Wu Dong-Xu1,2, Yu Jian3, Zhou Jin-Gao1,2, Wu Xing-Ning1,2, Yu Zhou1,2, Ding Zhen-Chun1, Wang Shao-Yi1, Li Wei-Ling1, Cai Jun1
1 PetroChina Hangzhou Research Institute of Geology,Hangzhou 310023,China; 2 Key Laboratory of Carbonate Reservoir,CNPC,Hangzhou 310023,China; 3 Changqing Oilfield Company,PetroChina,Xi’an 710018,China
Abstract The Member 4 of Majiagou Formation(i.e. Ma4 Member)of Ordovician in the Ordos Basin is the key target for risk exploration of natural gas in Lower Paleozoic. Based on the observation of core and thin section,the stratigraphic correlation,sedimentary structure description,well logging interpretation of rock structure and composition,and the combined well-seismic method for palaeogeomorphologic restoration,the palaeogeomorphology,sedimentary features and reservoir distribution of the Member 4 of Majiagou Formation in the Ordos Basin were analyzed in detail. Results show that: (1)Controlled by the palaeogeomorphologic pattern of uplift and depression in the depositional period,a lot of mound and bank microfacies developed in the Ma4 Member and the penecontemporaneous dissolution and dolomitization were prone to occur,making it become the favorable sedimentary facies belt for reservoir development. (2)The reservoir of Ma4 Member is mainly composed of(algal)arenaceous dolostone and silt-fine grain dolostone,and the reservoir space is mainly characterized as intergranular pores,intercrystal pores and dissolution pores. (3)The reservoirs are mainly distributed in Ma41 and Ma42 submembers,which are located at the low uplift belt in the platform and the platform margin belt. (4)The development of the reservoir is controlled by three factors.The mound-bank body developed in the palaeo-uplift is the material basis. The penecontemporaneous dissolution controlled by the high frequency sequence is the key to the formation of the reservoir,and dolomitization is an important factor for the preservation of the reservoir in the later period. The palaeogeomorphology of alternating uplift and depression in the carbonate platform during the Ma4 depositional period controlled the distribution of mound-bank facies and dolomite reservoirs,which provided a strong support for gas exploration in the Lower Paleozoic,and also provides a new idea for the study of the sedimentary reservoir in the carbonate platform.
Fund:National Major Science and Technology Project(Nos.2016ZX05004-002,2017ZX05008-005)and Major Science and Technology Project of CNPC(No.2018A-0103)
About author: Wu Dong-Xu,born in 1984,is a senior engineer with a master degree. He is engaged in research of carbonate reservoir. E-mail: wudx_hz@petroChina.com.cn.
Cite this article:
Wu Dong-Xu,Yu Jian,Zhou Jin-Gao et al. Sedimentary characteristics and reservoir controlling effect of the Member 4 of Ordovician Majiagou Formation in Ordos Basin[J]. JOPC, 2021, 23(6): 1140-1157.
Wu Dong-Xu,Yu Jian,Zhou Jin-Gao et al. Sedimentary characteristics and reservoir controlling effect of the Member 4 of Ordovician Majiagou Formation in Ordos Basin[J]. JOPC, 2021, 23(6): 1140-1157.
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