Study On Design And Application Of Seismic Data Cquisition Method For Offshore Incline Shaft

In our country,the geological conditions in many areas are more complex,the exploration levels of oil and gas are lower,and the storage ratio is far below the world average of 40:1.Oil exploration has entered the late stage,offshore oil and gas exploration and development will become the main battlefield.The cross-well seismic is excited in the well and is received in the well.It can obtain a higher resolution seismic signal,which is the bridge between the logging data and the ground seismic exploration.In the meantime,the cross-well seismic not only can perform small-scale tectonic imaging,but also can identify the thin sand bodies and reservoirs.The acquisition of cross-well earthquakes is special.On the basis of the present instrument and equipment,it is very important to obtain better seismic data by setting the order of the shot and the detection point in the limited financial,human and material resources.In the actual collection work,it can get a rich cross-well seismic wave field.In addition,a reasonable process needs to be established and interference waves are suppressed,so that the comprehensive interpretation is guaranteed.In this paper,we study the observing system of the cross-well seismic between the offshore slant wells,and analyze the observation system of oblique sub-well type,double left turn type,double right turn type flat layer,inclined layer.At the same time,we summary the observation system that uplink P wave,uplink S wave.We also analyze the observation system of uplink P wave,downlink P wave,uplink S wave,and downlink S wave.In addition,this paper analyzes and discusses the differences between the stratigraphic and oblique layer observing systems,and compares the design of Schlumberger's acquisition.Finally,this paper discusses the design of observational systems for complex theoretical data.Under the guidance of the method technology,we carry out the observation system design and the actual data processing for the actual seismic data between the wells in a certain area of Gansu Province.Finally,the drilling geologic data and logging data are considered,and the comprehensive interpretation of the seabed reservoir structure and fracture development arecompleted.The results show that the design of the inclined layer of the observation system is more difficult than the horizontal layer.In the meantime,the observation system of complex layer is more difficult than conventional layer.P wave and S wave imaging observation system than the upstream P wave,the uplink S wave need more shot and detection points.Compared with the uplink P-wave,the uplink S-wave imaging observation system,the P-wave and the S-wave require more shot and detection points.Under the same well type and stratigraphic conditions,the acquisition method of Schlumberger and the design of this article have their own advantages and disadvantages.Finally,this paper has been obtained the theoretical data and practical data validation,so as to achieve the desired purpose.