Study On The Connectivity Of Channel Sand Reservoirs In The Upper Guantao Formation Of The Chengdao Oilfield

The sand body superimposed relationship in the upper Guantao formation of the Chengdao Oilfield is complex and diverse.At present,the understanding of the oil-water movement laws and influencing factors of the upper Guantao formation is not well understood,and the understanding of sand body superposition and connectivity is unclear.This dissertation takes the upper Guantao formation of the Chengdao Oilfield as the research object,and comprehensively applies the data of field outcrop,connecting-well section to carry out the research on the sand body superposition model.The support vector machine is used to evaluate the sand body lateral connectivity of the typical horizon.This dissertation clarifies the lateral and longitudinal connectivity of the upper Guantao formation and constructs the sand body connectivity mode,which provides a geological basis for the next step of injection and production adjustment.Guided by modern sedimentation and field outcrops,three composite sand body superimposed models and four single-genesis sand body superimposed models were constructed in the upper Guantao formation of the Chengbei 11 well area in Chengdao Oilfield,and based on the superimposed model and the production data as verification,five sandstone typical connectivity modes and one composite connectivity modes were established.The lateral connectivity evaluation parameters of five sand bodies were selected.The support vector machine method was used to evaluate the lateral connectivity of the sand bodies in six typical layers of the upper Guantao formation,and the lateral connectivity characteristics were clarified.The geological factors affecting the vertical connectivity between the sand body layers and the sand body are clarified,and the longitudinal connectivity characteristics of the 5 sand group in the upper Guantao formation are revealed.