New analysis of lithofacies palaeogeography and exploration area selection of the Member 4 of Majiagou Formation in Ordos Basin
GUO Xujie1, WU Xingning2,3, JIN Wudi1, LIN Shiguo1, WU Dongxu2,3, YU Zhou2,3
1 PetroChina Exploration & Production Company,Beijing 100007,China; 2 Hangzhou Research Institute of Geology,PetroChina,Hanghzhou 310023,China; 3 Key Laboratory of Carbonate Reservoirs,CNPC,Hangzhou 310023,China
Abstract：Accurate restoration of lithofacies palaeogeography is of great significance to the prediction of favorable reservoirs in the Member 4 of Ordovician Majiagou Formation in the Ordos Basin and the selection of exploration regions and belts. Based on the field survey,identification of a large number of newly drilled cores and thin sections,single factor diagram analysis,well log interpretation for rock structure identification,and seismic interpretation,the sedimentary pattern of platform-platform margin-basin for the Member 4 of Majiagou Formation has been established. It is believed that the marginal zone was controlled by the distribution of Central paleo-uplift and the Wushenqi paleo-uplift inherited from the Cambrian. The NE-trending Yulin-Zhidan secondary low uplift zone developed in the platform. The depressions developed at both sides,and it then formed the sedimentary pattern of inter-uplift and depression in the platform. The interpretation of gravity,magnetic and seismic data indicates that the NE-trending aulacogen developed in the Ordos Basin during the Middle and Late Proterozoic,when it was under the tectonic setting of Huaiyuan movement,making this aulacogen have an important influence on the Ordovician Majiagou sedimentary pattern. Affected by the palaeotopography and aulacogen,the NE-trending grain beaches with the echelon form of the Member 4 of Majiagou Formation are mainly developed in the Central paleo-uplift and the Yulin-Zhidan low uplift belt,and the algal mound develops in the Shenmu-Mizhi uplift zone located in the eastern of the sedimentary basin. Based on the comprehensive study of structure,sedimentary reservoir characteristics and exploration practice,the Yulin-Zhidan secondary low uplift belt and the Shenmu-Mizhi algal mound development belt were selected as favorable exploration areas for large-scale gas accumulation in the Member 4 of Majiagou Formation. Results can provide important reference for the prediction and the optimization of exploration target areas of favorable reservoir of the Member 4 of Majiagou Formation in the Ordos Basin.
GUO Xujie,WU Xingning,JIN Wudi et al. New analysis of lithofacies palaeogeography and exploration area selection of the Member 4 of Majiagou Formation in Ordos Basin[J]. JOPC, 2023, 25(1): 105-118.
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