The Paleogene Dongying Formation in central area of Huanghua Depression: Depositional characteristics and prediction of favorable exploration area
Liao Yuantao1,2, Wang Hua2, Wang Jiahao2, Xiao Dunqing3, Huang Chuanyan2, Xia Cunyin2, Liu Yanbo2
1 Key Laboratory of Tectonics and Petroleum Resources, China University of Geosciences(Wuhan), Ministry of Education, Wuhan 430074， Hubei 2 Faculty of Earth Resources，China University of Geosciences(Wuhan)，Wuhan 430074， Hubei 3 Research Institute of Exploration and Development，Dagang Oilfield Company，PetroChina, Dagang 300280，Tianjin
Abstract：The characteristics of depositional systems of the Dongying Formation in the central area of the Huanghua Depression were analyzed based on analyses of sequence stratigraphy and modern sedimentology combined with core，well and seismic data. The Dongying Formation was formed in the transitional period of tectonic evolution from rifting to sagging stages. Mainly lacustrine deltaic and lacustrine systems were developed. Fan delta and turbidite systems were only distributed sporadically. Time-spatial distribution and evolution of the depositional systems were controlled by tectonic setting and sequence configuration. Three typical depositional models were established and they include gentle slope， fault-controlled steep slope， and multi-level step-fault. In details， lowstand and highstand systems tracts deltas were mainly developed in the SQEd3. Lowstand systems tract delta in local areas such as Banqiao Subsag and highstand systems tract delta with a large range were mainly developed in the SQEd2 and SQEd1x. Lowstand and highstand systems tract deltas were developed in the Qinan and Qibei Subsags in the SQEd1s. Based on the analysis of depositional systems， five types of traps were identified. They are subtle traps near the slope break， onlap pinchout traps across the sag center， structural-lithologic traps， and subtle traps including lowstand systems tract turbidites， highstand systems tract turbidites and incised valley. Six favorable exploration areas were predicted according to the characteristics of traps.
Liao Yuantao,Wang Hua,Wang Jiahao et al. The Paleogene Dongying Formation in central area of Huanghua Depression: Depositional characteristics and prediction of favorable exploration area[J]. JOPC, 2009, 11(5): 561-572.
