Characteristics and identification of edifices of Yingcheng Formation in the Xujiaweizi Fault-Depression
Qi Jingshun1,2, Wang Pujun3, Shao Yingmei2, Li Xingwei2
1. School of Energy, China University of Geoaciences, Beijing 100083;
2. Exploration and Development Research Institute of Daqing Oilfield Company Ltd., Daying, HeiLongjiang 163712;
3. College of Earth Sciences, Jilin University, Changchun 130061
Volcanic rocks were extensively developed in Lower Cretaceous Yingcheng Formation of the Songliao Basin,forming numerous and multifarious edifices and volcanic structures,some of which were buried into deep basin by the tectonic changes of later period and then came into being a large-scale petroleum reservoirs.Among multifarious seismic technical means, the regular seismic profiles, tectonic trend surface and attribute slices were selected for distinguishing each type of volcanic edifices, and classified the edifices' seismic characteristics in Yingcheng Formation of the Xujiaweizi Fault-Depression.To synthesize the deep drilling data in the studied area,we summarized five types of edifices in Yingcheng Formation of the depression, and there were more studies on distributing regularities and controlling factors of edifices in the studied area.Generally, regional faults controlled the volcanic eruption, the vents and centers constrained distribution of the volcanic lithofacies belts, and then the lithofacies determined the characteristics and spatial spread of petroleum reservoirs.