Sedimentary characteristics of Beichagou Sandstone in the Lower Permian Shanxi Formation in Ordos Basin and its effects on natural gas accumulation
HUANG Jiansong1,2,5, ZHENG Jie1,2, SONG Xiang1,2,5, LIU Lei5, YI Gang3,4,5, YANG Ping5
1 Exploration and Development Research Institute of Changqing Oil Field, PetroChina, Xi'an 710018, China; 2 National Engineering Laboratory for Exploration and Development of Low Permeability Oil & Gas Field, Xi'an 710018, China; 3 School of Geoscience and Technology,Southwest Petroleum University, Chengdu 610500, China; 4 Sichuan Baoshihua Xinsheng Oil and Gas Operation Service Co. Ltd, Chengdu 610056, China; 5 Changbei Operation Company of Changqing Oilfield,PetroChina, Xi'an 710018, China
Abstract：Beichagou sandstone,which is the marker bed between Shanxi and Taiyuan Formations of Permian in North China Platform,is widely distributed in the Ordos Basin and acted as the significant Upper Paleozoic natural gas reservoir. Based on the outcrop investigation,exploration data,and previous studies of palaeostructure and lithofacies paleogeography,the sedimentary characteristics of Beichagou sandstone in the Ordos Basin were analyzed in detail. Due to the abundant supply of coarse clastics with high quartz content in the provenance area in a short time,the lithology of the Beichagou sandstone is mainly gravel bearing coarse-grained quartz sandstone with quartz content up to 90%. The sand bodies are closely overlapped and stable distributed,and there is rare mudstone interlayer between single sand bodies. The paleogeography is highest in the north,high in the south and low in the south central,making the alluvial fan,gravelly braided river,braided river delta plain,delta front and prodelta successively advanced from the north and south margin to the central area of the Ordos Basin. Four large scale sand belts of delta deposit developed in the north part of the deposition center,while six small scale sand belts developed in the south region. Influenced by the sandbody size,variation of mineral composition and diagenesis,the reservoir properties of each sand belt varies greatly. The largest sand body along Hangjinqi-Yulin-Zizhou-Qingjian-Yonghe-Jixian,which is characterized as the highest quartz content,and very high dissolution of feldspar and other soluble minerals under the action of acidic formation water,has the favorable reservoir properties and beneficial for the accumulation of natural gas. The Beichagou sandstone along Hangjinqi-Yulin-Zizhou-Qingjian-Yonghe-Jixian,is a favorable belt for further exploration and development of natural gas in the Ordos Basin.
HUANG Jiansong,ZHENG Jie,SONG Xiang et al. Sedimentary characteristics of Beichagou Sandstone in the Lower Permian Shanxi Formation in Ordos Basin and its effects on natural gas accumulation[J]. JOPC, 2022, 24(4): 680-696.
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