Lake level effect on main sandbodies of delta front: A case study from outcrops of the Jurassic Yan'an Formation in Shenmu area, Ordos Basin
Qiu Longwei1, 2, Yang Baoliang1, 2, Zhang Yang3, Shi Zheng4, Wang Yelei1, 2, Tian Meirong5, Sui Shuling5
1 School of Geosciences,China University of Petroleum (East China),Qingdao 266580,Shandong; 2 Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,Shandong; 3 Research Institute of Exploration and Development, Dagang Oilfield Company,PetroChina,Tianjin 300280; 4 Wuxi Research Institute of Petroleum Geology,SINOPEC,Wuxi 214126,Jiangsu; 5 Research Institute of Exploration and Development,Shengli Oilfield Company,SINOPEC, Dongying 257000,Shandong;
Abstract：Outcrop section study can provide abundant geological information from the perspective of 2D or 3D,such as,sedimentary composition,structure construction and contact relations between strata. And it has a great significance for forecasting delta sandbody distribution rule,as well as the establishment of the underground reservoir geological model. The authors take outcrops of shallow-water lacustrine deltas of the Jurassic Yan'an Formation in Ordos Basin as examples. On the basis of lithofacies and sedimentary microfacies study,statistic analysis of thickness and width of single sandbody was made,and sandbody distribution rule of underwater distributary channel,river mouth and sand sheet was studied. The results show that the sandbody width and thickness ratio of the underwater distributary channel and sand sheet is higher at high water level,compared with that at low water level. Given certain water level,A/S value increases as the distance increases from provenance. Affacted by the A/S value which is controlled by water level and the distance from provenance,there are three main vertical superimposition patterns of sandbodies in subaqueous distributary channel and mouth bar,namely overlay type,joint type and isolated type. From overlay pattern to isolated pattern,the A/S value tend to become higher,and connectivity become lower.
Qiu Longwei,Yang Baoliang,Zhang Yang et al. Lake level effect on main sandbodies of delta front: A case study from outcrops of the Jurassic Yan'an Formation in Shenmu area, Ordos Basin[J]. JOPC, 2016, 18(6): 939-950.
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