Reservoir Fine Structure Interpretation And Fine Sand Body Fine Anatomy Of Keshang Formation In The 8Th District

The eight districts are located in the Baijiantan area 20 kilometers east of Karamay city.With the deepening of the exploitation,the Ke-Wu uplifting fault is now in a situation where the reservoir is heavily flooded,the remaining oil distribution is complex,and the well condition is more prominent.In order to tap potential remaining oil and improve development results,a series of work such as the use of geological background data and calibration of cores and log data were used.Combined with 3D seismic data and well logging data,structural fine interpretation and small sand fines were performed on the Keshang Formation in the 8th District.Anatomical research lays a solid foundation for the next remaining oil extraction and development plan deployment.The target layer is located on the southeast tilt monoclinic structure in the footwall of the Nanbaijiantan reversed cover fault.The strata gradually decrease toward the south and southeast.In this paper,three-dimensional seismic data are used to explain the horizons and faults and to monitor the quality.It is believed that the faults are mainly distributed on the Southern Baijiantan overburden fault zone,and the stress is far away from the southern Baicaitan fault and toward the center of the basin in the southeast direction.Weakening,faults are not developed.Based on previous research results,from the top to the bottom,there are five sand groups S1,S2,S3,S4,and S5,10 sand layers,and 19 small layers.S1 is a delta plain subfacies.It mainly develops river bed and embankment microfacies.The S2-S5 layer is the fan delta frontal facies.It mainly develops distributary channels and estuary sand dam microfacies.In this paper,the reservoir static model is established by using logging data and tectonic deposition isochronous frameworks,mainly for small sand body interpretation of S4 and S5.The early sand bodies in the S4 segment have a small area of distribution,which is mainly distributed in the northern part of the research well group and late in the study well group.The distribution area of sand bodies is large.In the upper plane of S5 due to the migration of the fan delta and the lateral accretion,the morphologies of the sand body in the plane change greatly.In addition to the scattered isolated and long strips,there are also complex irregular flaky and broad bands.In the early stage of S5,the lower reaches of the river are small in size,and the distribution area of channel sand is relatively small.The sand distribution is mainly in the shape of strips.The size of late rivers is large,the distribution area of sand bodies is large,and the sand bodies are mainly distributed in wide sheets.