准噶尔盆地红山嘴油砂成藏控制因素及储量计算

Controlling factors and reserve calculation of oil sands reservoirs in Hongshanzui area in the northwest edge of the Dzungarian basin

红山嘴油砂矿区位于准噶尔盆地西北缘,构造条件复杂。通过对本区沉积相、油源和运移通道的分析研究表明,含油砂体主要为三角洲平原分流河道沉积,砂体累计厚度大,砂体空间展布较好,为有利的油气储集空间;本区邻近的玛湖凹陷烃源岩类型好、生烃潜力大、热演化程度高,多期构造活动为油砂的形成创造了有利的条件;不整合面和断裂体系非常发育对本区油气的运移起着控制作用。通过含油率法得出红砂6井区0～50m埋深范围内的油砂油地质储量为61.5万t,可采储量达43万t。

Hongshanzui oil sands area is located in the northwestern edge of Dzungarian Basin,with geological structural conditions complexity.Through analyzing Sedimentary facies,oil source and migration pathway of this area,it shows that Oil sand bodies are mainly delta plain distributary＇s channel deposits,with large accumulative thickness is better spatial distribution,which is benefit for oil and gas reservoir.Objective area is adjacent to the Mahu depression that has good source rocks,large hydrocarbon generation potential and high thermal maturity,and multi-episodic tectonic activities have created favorable conditions for the formation of oil sands.Unconformity and fracture systems are well developed which play controlling role in oil and gas migration in this area.The geological resources amounts of oil from oil sand in the Hongsha 6 well area were calculated by the oil content method,the amount is 0.615 million tons in buried depth of 0 to 50 meters and recoverable reserves are 0.43 million tons.