Multi Attribute Fracture Prediction And Fracture Modeling On The Top Of Buried Hill In Bozhong Depression

Bozhong 19-6 deep buried hill tectonic belt is located in the southwest of Bozhong depression,Bohai Bay basin.It is a newly discovered area with large oil and gas reserves estimated at 100 billion cubic meters.The discovery of Bozhong 19-6 gas field has achieved a major breakthrough in natural gas exploration in Bohai sea area.I is of great significance to the exploration of natural gas in Bozhong depression and Bohai Bay basin.Although a large number of scholars have done a lot of research on the relationship between fracture system and accumulation in this region and have made many achievements.But the area experienced multiple tectonic movements,the formation of multiple fracture systems with different development under tectonic stress is kind of complex genesis,the fracture development and reservoir development are still in the initial stage compared with mature blocks,and we don’t know deep enough of it.This paper makes full use of seismic data and logging data in the research area,comprehensively predict the development direction,strength and distribution characteristics of fractures in the study area,conduct the Post-stack seismic attribute analysis and DFN discrete fracture network model.In the early stage,T8 reflector was carefully edited after understanding the regional geology,on the basis of previous data,explain the T8 reflector to a 10X10 grid,complete the detailed explanation of the T8 reflector fault.Carry out the detailed description of the structure of the submerged peak,it is considered that the buried hill top has the overall tectonic background of "1uplift,3 depression and 7 gullies".Studied the seismic response characteristics of buried hill reservoir,carry out a variety of special processing seismic data body optimization and data body fusion.Through many attempts,it is concluded that the data body fusion of "local tectonic tensor and amplitude energy" and "tectonic tensor amplitude energy fusion coherence" can be used to better identify the basement fault of buried mountain,prediction of buried mountain fault system.The study of porosity and permeability has always been the focus and difficulty in the field of oil and gas exploration.Although the fracture prediction method based on post stack seismic data can predict the fracture trend,distribution and other issues,it does not explain the impact of fractures on the porosity and permeability in the study area.In order to solve this problem,this paper establishes a three-dimensional geological model and equivalent fracture attribute model which can quantitatively describe the well side and the whole study area.The results showed that a large number of high-angle fractures were developed in Bozhong 19-6 kongdian formation,the permeability and porosity were higher than the upper dongying and shahejie formation.Through the comprehensive analysis of fracture network model,equivalent fracture attribute model and previous seismic attribute body.It helps us to further understand the real fracture development state in the study area and predict the favorable fracture development zone and fracture development law.The effects of fracture development on hydrocarbon reservoir space and seepage in this region are revealed.It is helpful to establish the exploration target and direction of Bozhong 19-6area,it is of great significance to improve oil and gas exploration efficiency and recovery.