赛汉塔拉凹陷中原区块烃源岩资源潜力分析

Potential Analysis of Hydrocarbon Source Rocks in Zhongyuan Block,Saihantala Sag

二连盆地赛汉塔拉凹陷在早白垩世属于沉降幅度中等、相对继承性发育的凹陷。以同生断陷超覆型凹陷成盆、成烃和成藏理论为指导,应用沉积相分析、有效烃源岩评价、剥蚀厚度恢复及改造型盆地模拟等技术和方法,对中原区块泥页岩进行有机地球化学分析以及各项指标的综合评价,预测了中原区块都北洼槽油气资源潜力。赛汉塔拉凹陷下白垩统巴彦花群发育一套内陆河湖相碎屑岩沉积,其中发育的暗色泥页岩是优质烃源岩,借鉴二连盆地油气田勘探发现的启示,提出了都北洼槽油气成藏规律。对二连新区突破靶区的选定有非常现实的意义。

The Saihantala Sag of Erlian Basin features in medium amplitude sedimentation and relative inheritance development in the Early Cretaceous Epoch.Guided by theories of basin evolution and hydrocarbon generation and accumulation of overlapped sags in syngenetic fault depressions,this paper conducts organic geochemistry analysis on the shale and evaluates all kinds of geochemical indexes comprehensively,and predicts the oil & gas resources potentialities in Dubei Sag of Zhongyuan Block,based on such technology as sedimentary facies analysis,effective hydrocarbon source rock evaluation,erosion thickness restoration,and reformed basin modeling,etc.The Lower Cretaceous Bayanhua Group has a set of inland fluvial-lacustrine clastic rocks in Saihantala Sag,and the black mud shale here belongs to high quality hydrocarbon source rock.Based on the discoveries in exploration of oil and gas fields in Erlian Basin,this paper puts forward the oil and gas accumulation law of Dubei Sag.This is of realistic significance to select the target in Erlian Basin.