Enrichment Regularity And Main Controlling Factors Of Remaining Oil In Southern Gaoshangpu Oilfield At Extra High Water-cut Stage

This thesis takes the shallow layer reservoir of Gaoshangpu Oilfield as an example. Aiming at the problems caused by high water cut and low oil recovery, key controlling factors of remaining oil, including single sand bodies and its interlayers, water flooded rules and predominant pathways, are studied with the integration of geology, logging, laboratory test and production data. Enrichment regularity of remaining oil is analyzed. The following conclusions are summarized.The main layers of single sand body are divided. Single sand body interlayers are finely studied,four kinds of architecture models and three kinds of plan distribution pattern are recognized. Water flooded layer log interpretation is carried out and water flooded characteristics of edge and bottom reservoirs are summarized. Comprehensive judging parameters method is established to identify predominant pathways by optimizing selected the parameters. Using the method of Positive and Inverse Cumulating Blocks, the comprehensive judgment index of recognizing predominant pathways was set at 0.31. The predominant pathways extend along high property zone in horizontal direction, and along bottom of the single sand bodies vertically. Based on the study of main controlling factors, enrichment regularity of remaining oil, which is studied with the integration of dynamic and static data, are summarized including:①nrichment regularity of remaining oil controlled by the single sand bodies;②emaining oil distribution controlled by by flooding characteristics of edge and bottom water reservoirs;③nrichment regularity of remaining oil controlled by predominant pathways.