EFFECTIVE SEISMIC TECHNOLOGIES FOR NEW GEOLOGICAL DISCOVERIES IN EAST SIBERIA

Currently, East Siberia as a whole and the Republic of Sakha (Yakutia) in particular are the territories of extensive geological exploration. Field geophysical surveys are mainly performed by seismic technologies used to discover new deposits and provide data for detailed appraisal of the known fields. Three-dimensional seismic surveys are effectively used for clarifying the details of geologic structures and obtaining the data for drilling programs. Upon further development of technologies, improvements are introduced in field operations, seismic data processing and interpretation, and drilling programs. As the information content of the survey data increases, it becomes possible to revise and update geological models and/or develop them in a more detail. With the use of modern data processing technologies that preserve the signals and depth migration data, the tectonic model of the Srednebotuobinskoe Oil and Gas Condensate Field was fully modified. Furthermore, additional isolated tectonic blocks were discovered in the eastern part of the Central deposit, and their map was constructed. The geological exploration based on the updated tectonic model is successful – new mineral reserves have been discovered, and the vector of geological exploration has been completely changed

ЭФФЕКТИВНЫЕ ТЕХНОЛОГИИ СЕЙСМОРАЗВЕДКИ ДЛЯ НОВЫХ ГЕОЛОГИЧЕСКИХ ОТКРЫТИЙ В ВОСТОЧНОЙ СИБИРИ

Currently, East Siberia as a whole and the Republic of Sakha (Yakutia) in particular are the territories of extensive geological exploration. Field geophysical surveys are mainly performed by seismic technologies used to discover new deposits and provide data for detailed appraisal of the known fields. Three-dimensional seismic surveys are effectively used for clarifying the details of geologic structures and obtaining the data for drilling programs. Upon further development of technologies, improvements are introduced in field operations, seismic data processing and interpretation, and drilling programs. As the information content of the survey data increases, it becomes possible to revise and update geological models and/or develop them in a more detail. With the use of modern data processing technologies that preserve the signals and depth migration data, the tectonic model of the Srednebotuobinskoe Oil and Gas Condensate Field was fully modified. Furthermore, additional isolated tectonic blocks were discovered in the eastern part of the Central deposit, and their map was constructed. The geological exploration based on the updated tectonic model is successful – new mineral reserves have been discovered, and the vector of geological exploration has been completely changed.В настоящее время в Восточной Сибири в целом и на территории Республики Саха (Якутия) в частности выполняются масштабные геологоразведочные работы. Основной объем полевых геофизических исследований приходится на сейсморазведочные работы для поиска и разведки новых объектов, для доразведки действующих месторождений. Для детализации геологического строения и постановки бурения эффективно используется площадная сейсморазведка 3D. По мере развития технологий совершенствуются методики полевых работ, обработки и интерпретации сейсмических данных, реализации программы бурения, происходит повышение информативности данных и становятся возможными переосмысление/детализация геологической модели среды. Так, на Среднеботуобинском нефтегазоконденсатном месторождении, используя современные технологии обработки с сохранением сигнала и глубинной миграции, удалось перевернуть представления о тектонической модели месторождения, закартировать дополнительные изолированные тектонические блоки на востоке Центральной залежи, провести геологоразведочные работы на основе актуализированной тектонической модели, открыть новые запасы и полностью изменить направление вектора геологоразведочных работ