The process of raising the gas-water contact (GWC) is inevitable during development of the reservoir. This leads to flodding of wells and reducing of daily gas production. Horizontal sidetracks and new horizontal drilling allows to maintain production at the required level. Mostly, the direction of the horizontal section of the well determines its efficiency. In difficult geological conditions, a detailed analysis of seismic data in the drilling area allows to reduce drilling risks and achieve planned starting rates. Accounting of seismic data in geological models is often limited by a low correlation coefficient between reservoir properties obtained from wells and seismic attributes. Simulation models use seismic data based on the assumptions made by the geological engineers.
Materials and methods
In this paper authors uses a iterative approach to geological modeling: implementations include in-depth analysis of seismic data and well performance dynamics. Modern software modules were used to automatically check the compliance of the geological implementation with the development history, as well as to assess the uncertainties. High correlation coefficients between well water cut and seismic attributes obtained. Authors developed a method for determining the presence of shale bodies and “confluence windows” of a massive gas reservoir with water-saturated volumes.
geological modeling, simulation run, Pokurskaya suite, gas reservoir, cenomanian, horizontal wells, attribute analysis