Prediction method of interlayer distribution between horizontal wells by coupled multi-information

Key words:  interlayer interval prediction  static geological features  acquisitions of inclination and dip angle  horizontal well interpretation  dynamic characteristics  multi-information coupled

Abstract:

Based on a multi-disciplinary analysis that combines core data, conventional logging, inclination logging, horizontal well logging and production records, this study targets the static geologic characteristics, acquisitions of inclination and dip angles, response characteristics of horizontal well logging and dynamic response characteristics of the interlayers in Donghe sandstone of Hadeson Oilfield in Tarim Basin. Through the process of "guidance of static geological pattern, multi-series well logging interpretation, acquisitions of inclination and dip angle, horizontal well interpretation, matching of guide well and horizontal well, prediction and verification of dynamic characteristics", an innovative and practical prediction method of interlayer distribution between horizontal wells by a coupled multi-information system was put forward. The interlayers in the study area included argillaceous, calcareous and calcareous-argillaceous interlayers, which can be divided into interbedded interlayers, interlayers betweens and bodies and interlayers in single-sand body. Processing parameters were preferred with 0.2m in window length, 0.02m in step length, and 30 in probe angle to pick up the inclination and dip angles of the interlayer, which is then transformed to the horizontal well. The position of the interlayers could be qualitatively identified by the abnormal logging response of the horizontal section and the relative change between the resistivity of the interlayers and the reservoirs. The correspondence model of perforation and injection, the curves of water cut and liquid production in the study area were divided into different types. The dynamic production characteristics of a well inwater injection area, border water area and bottom water area were established in correspondence with three kinds of distribution patterns of interlayers, i.e. continuous, semi-continuous and discontinuous; and with two forms of interlayers, i.e. parallel and inclined.