Study On Architecture Characterization And Fine Modeling About Single-Sand Body In Delta Front Of B Oil Field In The Block ?,Peru

Peru block 6 is a typical complex fault block oil field with broken structure and complex fault blocks.Study area B oilfield is located in the southwest depression of block 6.Although the oilfield has been developed for many years,the new drilling shows that the remaining recoverable reserves in the block are still high,and there is great development potential.Due to the lack of seismic data in the study area,mainly relying on drilling data for the study,coupled with the complex fracture system,resulting in insufficient understanding of the single sand body,but also has not carried out sand body configuration and three-dimensional geological modeling research,the remaining oil distribution law needs to be clarified.Aiming at these development problems,the paper selects the main oil-bearing sand group Pa group in B oilfield,combines the structure,log,logging,core description and development dynamic data,carries out the research on the type,geometry and distribution laws of single sand body.The sand body configuration mode is established.According to the distribution laws of sand body,the single sand body configuration model,porosity & permeability model and saturation model are established in the study area,and the distribution laws of macro remaining oil is analyzed.The following achievements and understandings have been made:1.A five-level classification scheme for the internal configuration of the Pa formation reservoir in the study area is proposed.By identifying three sets of mudstone interfaces with relatively stable distribution,the single sand body stages of 53 wells in the study area are divided.The two sub layers,Pa_SUP and Pa_INF,are further divided into four single sand layers: Pa_S1?Pa_S2?Pa_I1 and Pa_I2.2.According to the splicing pattern and identification mark of logging curve of single sand body,the single sand body inside the composite sand body is identified and divided.It is concluded that the study area develops three types of single sand bodies,including distributary channel sand,mouth bar sand and sheet sand.3.Five types of sand body configuration models are summarized: channel and channel,channel and mouth bar,mouth bar and mouth bar,mouth bar and sheet sand,channel and sheet sand.The results show that the 4 stages of single-sand structure pattern are mainly the transverse migration and longitudinal superposition of channel and channel,channel and mouth bar.4.There are two types of interbeds: argillaceous interbed and physical interbed.The interlayers are superimposed in a progradational manner along the source direction,with an inclination angle of 1 ° to 5 °;the interlayer is top-convex in the direction of vertical source.The argillaceous interbed is formed in a weak hydrodynamic environment,and is mainly developed near the top and bottom of various single sand bodies.It is the main interlayer in the study area.The physical interbed is a stagnation deposit at the bottom of the channel with high mud content,which is mainly developed in the interior of a single sand body and is a relatively undeveloped interlayer.5.Based on the fine modeling studies of single sand body,combined with the vertical and horizontal distribution characteristics of the oil layer,through the calculation of single well remaining oil and the comparison of production performance of typical wells,the macro distribution characteristics of remaining oil are analyzed: At present,the remaining oil is mainly concentrated in the positive structure?high position,with fault shelter?,two different parts of single sand body superposition,the lower part of the effective sealing part formed by interlayer and the relatively low value area of porosity and permeability;In terms of the type of single sand body,the degree of remaining oil enrichment of mouth bar is greater than that of distributary channel and sheet sand.