Seismic sedimentology of delta-fed turbidites of the Eocene in Dongying sag,Bohai Bay Basin
Liu Jianping1, Xian Benzhong1, 2, Wang Lu1, 3, Lu Zhiyong4, Li Yuzhi4, Liu Saijun1, Jiang Jian1
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249; 2 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249; 3 Changqing Business Division,CNPC Logging Group,Xi'an 710201,Shaanxi; 4 Dongxin Oil Production Plant,Shengli Oilfield Company,SINOPEC,Dongying 207015,Shandong;
Abstract：Gravity-flow sandstones fed by sediment slumping on the delta front in lacustrine basin is widely concerned due to their huge oil-gas exploration potential. Lacustrine turbidite reservoirs with small thickness,small scale and multi-layer limited the fine hydrocarbon exploration and development of gravity-flow deposits. Based on studies of sequence stratigraphy,sedimentology,drilling and logging data,and full-covered 3D seismic data,seismic sedimentology of the Eocene delta-turbidite sedimentary system was studied in Dongxin area,Dongying sag. The research shows that the middle sub-member of Member 3 of Shahejie Formation corresponds to a 3rd order sequence that formed under declining base level,and the highstand system tract is characterized by six phases of delta progradations(parasequence sets 5 to parasequence sets 10). According to a case study from parasequence sets 8,three delta-turbidite sedimentary systems from different provenances were confirmed within the 4th order sequence,and the distribution of thin sandstone were identified by strata slices. Seismic velocity heterogeneity in delta-turbidite areas is resulted from particular strstigraphic contact and sharply lateral changes in strata thickness and lithology. Phase adjustment after fine well-seismic calibrating for the target reservoir is the foundation of seismic sedimentology in delta-turbidite system,and restriction from the 4th order sequence(rather than systems tracts or the 3rd sequence boundaries)is the key of ensuring the isochronism certainty of strata slicing. This study shows that seismic sedimentological study restricted by the 4th order sequence provided a powerful technical support for lateral reservoir prediction of thin gravity-flow sandstones fed by delta,and provided a foundation for reconstruction of depositional process and deepening the understanding of depositional rules of deep-water gravity flows.
Liu Jianping,Xian Benzhong,Wang Lu et al. Seismic sedimentology of delta-fed turbidites of the Eocene in Dongying sag,Bohai Bay Basin[J]. JOPC, 2016, 18(6): 961-975.
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