Distribution And Prediction Of Deep Sandstone Reservoir In Es₃ Segment Formation Of Qingshui Sub-Sag In Western Liaohe Depression

Qingshui sub-sag is the largest oil-producing sag in the western depression of Liaohe basin,which has very high quality oil and gas resources.The Es₃segment formation in Qingshui sub-sag is buried deep and the exploration degree is low.This study aims at predicting and describing the distribution characteristics of Es₃segment formation in Qingshui sub-sag,and uses a variety of geophysical exploration techniques to carry out research.With the idea of integration of processing and interpretation,the application of OVT processing,blue filtering and other targeted processing techniques to ensure the quality of deep seismic data and establish effective seismic reservoir data body.On this basis,the structural characteristics of the study area were analyzed by multi-dip scanning,structure-guided filtering and ant body attributes.With the combination of well and earthquake,the distribution characteristics of seismic facies in each tectonic belt in the study area were defined,and the root mean square amplitude plane attribute quality control was applied to implement the planar distribution of sedimentary facies in the deep sequences of Es₃segment formation in the study area.The results of OVT processing data were used to carry out constrained sparse pulse inversion for seismic reservoir prediction for each sequence in the deep layer of Es₃segment formation in the study area,and the reservoir was tracked and described based on the constrained sparse pulse inversion.Finally,the distribution law and distribution range of the deep sandstone reservoir of Es₃segment formation in the study area were defined.It is concluded that fan delta-semi-deep lake system,nearshore subaqueous fan-semi-deep lake system and turbidite fan-semi-deep lake system were mainly developed in the sedimentary period of Es₃segment formation in the study area.The Xinglongtai paleo-uplift and basin hydrodynamic changes had a certain control effect on the deposition in the deep sequence of Es₃segment formation in the study area.The OVT processing results of the deep layer data of Es₃segment formation accurately implemented the distribution characteristics of sedimentary bodies and the distribution range of sandstone reservoirs in the study area.This research process can deepen and guide the exploration practice of deep sandstone reservoir in the west Liaohe depression,and become a feasible and effective prediction idea and technical method for the future prediction of deep sandstone reservoir in the west Liaohe depression.