Key characterization techniques for traps controlled by low order unconformity: A case study of the south slope belt in the Dongying Sag
Liu Shuhui1, Cai Juhong2, Guan Xiaoyan1, Chen Tao1
1. Exploration and Development Research Institute, Shengli Oilfield Branch Co., SINOPEC, Dong-ying, Shandong 257015, China; 2. Petroleum Development Center Co. Ltd, Shengli Oilfield Branch Co., SINOPEC, Dongying, Shandong 257015, China
Abstract:Low order unconformities were well developed in the Eogene in the south slope belt of the Dong-ying Sag in Jiyang Depression,and they provided favorable conditions to form stratigraphic traps and reservoirs.Due to a very short geologic period,there are little difference in form and petrology of strata beneath and above the unconformities,and there is also little difference between conventional logging and seismic data.This causes difficulties in pinch-out identification along the unconformities in this area.To overcome these difficulties,we propose a comprehensive layered curve method based on optimal segmentation of ordered series,and combine with high-resolution seismic time-frequency analysis.So an approach of low order unconformity identification is developed.Seismic data is converted into character expressions,and establish strata pattern "gene".Automatic search in the character domain is feasible to realize refined cha-racterization of pinch-outs.The proposed approach has been applied to the south slope belt in the Dongying Sag and good results are achieved.
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Liu Shuhui, Cai Juhong, Guan Xiaoyan, Chen Tao. Key characterization techniques for traps controlled by low order unconformity: A case study of the south slope belt in the Dongying Sag. Oil Geophysical Prospecting, 2018, 53(5): 1022-1030.
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