Study On Structure Characteristics And Modeling Of Shahejie Formation In Wangxuzhuang Oilfield Of Huanghua Depression

Located in Nandagang structural belt of Qikou depression,Wangxuzhuang Oilfield has entered the late high water-cut stage.Due to the complexity of the structure and sedimentary discipline,the remaining oil is highly scattered distribution.In order to speed up the development process of the oilfield,this thesis classify and compare the Shahejie formation stratum,carry out tectonic seismic interpretation and mapping based on logging,and seismic data.To the end through the establishment of structural models to provide solid evidence for the next step in the study of sedimentary facies and reservoirs.The main achievements of this dissertation are as follows:1.Stratigraphic division and comparison:select key bed,through the fine interpretation of single-well and wells stratigraphic comparison sections,the original Shahejie formation 2+3 section was divided into Shahejie 2 and Shahejie 3 sections,and the main fault block to the two strata General stratification incommensurability problem was solved.Based on the drilling data,comprehensive seismic interpretations data,shahejie formation were further divided into five small layers:Es₁^x,Es₂,Es₃¹,Es₃²,and Es₃³,and corresponding maps were compiled.2.Seismic Interpretation:Through the make of synthetic seismograms and serial well seismic section to calibrate five seismic horizons,we obtained the reflected wave characteristics of the Es₁^z bottom、the Es₁^x bottom、the Es₂ bottom、the Es₃¹ bottom、and the Es₃ bottom are as follows:Es₁^z is a strong energy wave in the whole area,the energy of depression is stronger than high position of middle structure;Es₁^x bottom shows a strong continuous reflection wave;Es₂ bottom shows a strong negative phase,the amplitude of reflection wave is strong and can be continuously tracked in profile.Es₃¹bottom is generally a medium energy reflected wave,and the stable waveform can be tracked in the whole region continuously;On the whole research area,the bottom of Es₃shows a weak energy,compared to the Mesozoic stratigraphy,There are obvious changes in the characteristics of reflection wave.3.Structure Characteristics:The faults are graded and staged by the flat profile combination,then we know the faults main develop in two phases.The first stage fault began to develop from the Es₃ period,and the toward was northeast;The second stage fault was developed in the Es₁ period,and moves toward east-west.From the structure figure,we can learn the anticline structure is mainly develop in the northern section of the study area,and the southern part mainly develop fault blocks and broken nose structures.4.Structural modeling:Using seismic interpretation data,geological stratification and structural maps data from work area,through petrel software to establish a structural model that include each stratum of the Shahejie Formation in the Wangxuzhuang oilfield.The model provide a foundation for establish the sedimentary facies model and the physical model,which provide a direction for the development of the oil field in future.