Research On The Fourth Section Of Akekule Formation At Western Akekule Uplift,Tarim Basin

Tarim Basin Akekule region rich in oil and gas resources which is the first large-scale marine oil and gas fields found in China.The exploration long-term focus on carbonate formations.Recent studies have shown that the clastic rocks of this area also has great potential for exploration.This article is aimed at the four sections of the Triassic in the west of Akekule,combing seismic forward modeling and reservoir parameter statistical inversion and predicts the channel sandstone reservoirs in this section.The main contents of the paper are as follows:1.High seismic resolution processing.The complicated stratigraphic structure of the studied area,the fast lateral changes and the serious wave field tuning of reservoir seismic response result in the unclear contact between the layer and composite wave overlap between the layers.In order to get the ideal effect,the seismic data is processed at high resolution.Then the effects of noise are eliminated by wavelet transform and proper compression of seismic waves which improve the seismic record resolution effectively.2.Seismic forward modeling.Based on high resolution,the simulation of forward modeling is carried out.It is hard to explain the geological structure due to the relatively developed sand and shale in this area.So in order to solve this problem,the simulation process of "trial and error method" is used to replace the underground geological structure to find a more accurate seismic forward model.In particular,the characteristic manifestations of channel sand bodies in seismic sections are discussed.At the same time,through the identify and characterize the river by forward modeling,we can get the distribution of the reservoir from whole region.3.Random inversion simulation.Firstly,process the inversion data which include the selection and reconstruction of well curve establishment of reliable geological model and extraction of integrated seismic wavelet.On the basis of the above,the random inversion is carried out based on the geological framework model,the logging data and the seismic data,obtaining a set of reservoir parameter models.The accuracy of the results is verified by the original seismic data attributes and the inversion data attributes.4.Tectonic analysis and seismic attributes.Using coherent body,ants body technology to characterize the fault of the region,generating the tectonic map with the seismic horizon and combined with the seismic RMS instantaneous amplitude attribute map and sand body plane distribution map to implement favorable traps.5.Identification and characterization of geological channel.Use the seismic attributes to identify the channel and draw the top tectonic map of the channel.Make use of the seismic data,the inversion results and the logging data to track the extension of the channel.6.The selection of favorable traps.Reservoir is evaluated and forecasted by the combination of seismic forward results,inversion results,tectonic analysis,channel characterization and sedimentary characteristics.In the end,select the favorable trap.