Retrospective assessment of the structural models accuracy. Case study in the fields of Gazprom neft

Abstract

   The paper presents existing approaches of the structural models buildings and the accuracy assessing of the maps. The importance of the correct building of structural maps for the oil fields was shown. The retrospective accuracy as­ sessing was done for three fields. It is shown that some values of accuracy given in the specification may not reflect the actual error of seismic models. The accuracy is confirmed with the formal assessments provided in the report in drilling in a region uniformly covered by the control wells. However, the error can increase considerably in drilling in the "external" parts. The error estimation, carried out considering the date of well-drilling, displays an insignificant modification of it's value with the time. The obtained results can be used in the risk assessments of drilling new wells, as specified in the work fields and deposits of analogues.