Перспективы нефтегазоносности рифовых отложений на юге Вилюйской синеклизы по геофизическим данным

Abstract

The article discusses the results of the study of the buried Cambrian organogenic reef structures in the Siberian platform east, their reservoir properties assessment, and the nature of their distribution. The basis for the study was the seismic, electrical and geochemical investigations conducted on the territory. Also involved were the results of the paleogeographic reconstructions. The study has defined the resistance levels for the Cambrian-Vendian deposits that correspond to the development of the reservoirs promising for oil. The authors have constructed geoelectric sections that reflect the development of the organogenic structures in the joint area of the Vilyui syneclise and Aldan anteclise. The geoelectric characteristics of the West Yakut barrier reef and the demolition zone of the destroyed buildings have been described. The issues of hydrocarbon migration and accumulation within the region have been considered. Promising zones for drilling prospecting wells have been identified. The buried reef structures and the zone of the organogenic material demolition can serve as foci of hydrocarbon generation. The absence of the extensive high-resistance covers on the site makes it possible to predict the development of fractured-cavernous collectors formed by the leaching processes prevailing against the background of the water saturation of the Perm deposits in the Vilyui syneclise, and the transgression-regression stages. The Domanicoid type Kuonama deposits of the Yudomo-Oleneksky basin bordering the barrier reef can be considered hydrocarbon sources.