The oil and gas contents of the Lower Jurassic and Achimovka reservoirs of the Nyurol’ka megadepression

Abstract

The paper describes Lower Jurassic (horizons J16 and J15) and Achimovka (Neocomian clinoforms) reservoirs in the area of the Nyurol’ka megadepression and its framing (42,000 km2). The total thicknesses of seven Achimovka sedimentary cycles are mapped. The thermal history of the Togur and Bazhenov parental sediments in the sections of 39 deep wells is reconstructed by paleotemperature modeling. The geotemperature criterion is used to identify paleosources of oil generation, starting from the Jurassic. The distribution of the relative density of the resources of the generated Togur and Bazhenov oils is estimated and shown on sketch maps. The Lower Jurassic reservoir is divided into zones depending on the distribution of the relative density of the Togur oil resources, and the Achimovka reservoir, of the Bazhenov oil resources. The priority oil search zones are proposed.

Terrestrial heat flow and geothermal field characteristics in the Bide-Santang basin, western Guizhou, South China

“…The present-day geothermal field is significant for coal and CBM exploration and exploitation, geothermal resources prediction, and geological hazard prevention. Present-day geothermal research is focused on the factors controlling the distribution of formation temperature, geothermal gradient, and terrestrial heat flow (Deng et al, 2012; Jiang et al, 2016; Pascal, 2015; Reiter, 2014; Tanikawa et al, 2016) and has recently received considerable attention related to the exploration and exploitation of coal, petroleum, and natural gas (Feng et al, 2017; Isaev et al, 2014; Kuzielová et al, 2017; Li et al, 2017; Liu et al, 2016; Safari et al, 2017). Temperature is one of the primary factors controlling hydrocarbon generation, sediment diagenesis, migration of hydrocarbons, and pore fluids (Nwankwo, 2007).…”

Logging Characteristics and Identification Methods of Low Resistivity Oil Layer: Upper Cretaceous of the Third Member of Qingshankou Formation, Daqingzijing Area, Songliao Basin, China

“…The identification and evaluation of low resistivity reservoirs are technically challenging [11][12][13][14][15][16]. This study focuses on the low resistivity thick sandstone in the X∼XII groups of the K 2 qn 3 (the third member of Qingshankou Formation)…”