Sedimentary characteristics and petroleum geologic significance of deep-water gravity flow of the Triassic Yanchang Formation in southern Ordos Basin
Sun Ningliang1, Zhong Jianhua1, Wang Shubao2, Liu Shaoguang3, Ni Liangtian1, Qu Junli4, Hao Bing1, Liu Chuang1
1 School of Geosciences,China University of Petroleum(East China),Qingdao 266580,Shandong; 2 Yanchang Oil Field Co., Ltd., Xi'an 710018,Shaanxi; 3 Exploration & Development Technology Research Center of Yanchang Oil Field Co., Ltd., Yan'an 716000, Shaanxi; 4 Strategic Research Center of Oil and Gas Resources,Ministry of Land & Resources,Beijing 100034;
Abstract：Through the observation of abundant cores, analysis of drilling and logging data,and outcrop observation,the sedimentary characteristics,triggering mechanisms,sedimentary process and pattern of deep-water gravity flow were analyzed in detail in the Chang 6-7 intervals of the Triassic Yanchang Formation,southern Ordos Basin. The results show that there are five types of gravity flow sediments,which are slipped mass,slump deposits,sandy debris flow deposits,turbidity deposits and muddy debris flow deposits. There are five vertical combination styles of gravity flow deposits in the study area. The sedimentary process of gravity flow can be divided into five stages,which are delta front sedimentary stage,slide stage,slump deformation stage,sandy and muddy debris flow stage and turbidity flow stage. Slide and slump sand bodies are formed in shapes of isolated lens;sandy debris flow sand bodies are formed in fan channel;and turbidity sand body are formed as sheet sand,mainly distributing in the front or sides of the fan channel. Sand bodies of deep-water gravity flow are vertically superposed in large thickness,which could form large scale reservoirs and extremely extends the exploration of deep lake sedimentary facies. In the study area,sand bodies of sandy debris flow in Chang 6-7 intervals are worth of great concern for their preferable physical properties and hydrocarbon potential.
Sun Ningliang,Zhong Jianhua,Wang Shubao et al. Sedimentary characteristics and petroleum geologic significance of deep-water gravity flow of the Triassic Yanchang Formation in southern Ordos Basin[J]. JOPC, 2017, 19(2): 299-314.
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