Evolution of Approaches to Oil Rims Development in Terrigenous Formations of Eastern Siberia

Abstract

Evolution of approaches to the development of oil rims is presented, based on the results of full-scale development of large oil and gas fields of East Siberia (Verkhnechonskoye, Srednebotuobinskoye, and Yaraktinskoye) put into production, in which a significant share of oil reserves (29% to 69%) is concentrated in the areas having a gas cap on top (figure 1). Production from these fields is confined to clastic reservoirs which in a number of key parameters are geologically similar, and at the same time in other key parameters are substantially different. A distinctive feature of the publication is the description of the process of change of solutions for the development of oil rims, where simulation models were used as the main tool of investigation. All available technologies and the efficiency of their combined application were assessed for each reservoir, taking into account their unique geological structure (areal and crosssectional heterogeneity, reservoir permeability, presence of an aquifer). The value of this work lies in systematization of practical experience of designing the development of, and operating the oil rims of the three large oil and gas fields in East Siberia, which forms a knowledge base for the development of the second stage oil and gas fields of the region. The accumulated pool of technological solutions adopted for implementation covers a range of various geological conditions of the productive clastic reservoirs.