Forecast of Boundaries of Hydrocarbon Deposit Productivity Based on the Data of Land Geochemical Surveys, Seismic Exploration and Drilling

The relevance of the research results from the increasing complexity of the structure of hydrocarbon deposits, which are objects of exploration and development in Western Siberia. Exploration efficiency can be improved by using a technique able to provide fundamentally new geological information – a land geochemical survey detecting oil migrational hydrocarbons on the surface. The purpose of the work is to improve interpretational models used when integrating seismic and drilling data with detailed geochemical survey results. To solve this problem, the authors analyzed the results of geochemical surveys carried out in two areas. In one area, the investigation was aimed at identifying the type of the reservoir fluid content prior to drilling, on the other – at delineating a gas deposit. It was discovered that surface gas shows depended on the reservoir fluid content (hydrocarbons or water) and the vertical permeability of overlying rocks. The discovered local zones of active hydrocarbon migration show that cap rocks lose their sealing properties, which allows identifying lateral boundaries of trap productivity.

کلیدواژه ها:

Land geochemical survey ، Snow survey ، Hydrocarbon migration ، Geochemical indicators of oil and gas occurrence ، Tazovskoye field ، Vostochno-Terelsky prospecting block