The Study On Sand Causes,Classification And Distribution Of Shan 1 Of Zp1

Wellblock Zp1 is located in the southwest of Ordos Basin.Shan 1 is the main gas-bearing bed,on the basis of surveying predecessors' research results and the principle of modern sedimentology,the article studies the source directions,sedimentary facies of Wellblock Zp1 and the distribution,factors and classified evaluation of sand body systematically by using geological data,core data and well logging data.The author think provenance of research area is mainly from the southwest.By studying the plane distribution feature and the profile distribution feature of sand body of Shan 1,the sand body of Shan ₁³ is considered as development and relatively continuous.In a plane,the sand body of Shan ₁³ presents zonal distribution.The thickness greater than 10 m.Applying the dacies marker feature and the electrofacies feature.Shan 1 developed delta front intrafacies,including distributary channel,subsea natural barrier,flood fan and underwater distributary interchannel.According to control of sedimentary facies,the sandstone of Shan 1 divide into two types: single sand body and overriding sand bodies.The genetic type of single sand body cover distributary channel sand body,subsea natural barrier sand body,flood fan sand body and underwater distributary interchannel sand body.The genetic type of overriding sand bodies cover thick sand bodies and interlayer sand body in delta front.According to the electrofacies feature and sedimentary microfacies,single sand body is divided into 4 types??,?,? and ??and overriding sand bodies is divided into 2 types?? and ??.Finally predicted the favorable zones of Shan 1 sand body spread over well Qing39-Qing34.