准噶尔盆地石南地区清水河组油气成藏条件

Conditions of Oil and Gas Accumulation in Qingshuihe Formation of Shinan Area, Junggar Basin

为扩大准噶尔盆地石南地区白垩系勘探成果,综合利用地震正演、反演、地震属性等方法,重新对该区清水河组进行地层划分与油气成藏条件分析。在利用沉积旋回和测井曲线形态特征共同确定标志层的基础上,通过井震结合,建立了全区统一的地层格架,刻画出清水河组一段沉积时期的古地貌。石南地区发育的沟谷地貌控制着沉积相带的展布,在下切的冲蚀凹槽内发育优质储集层。储集层预测和含油气检测证实,具备底板的优质储集层是油气成藏的首要条件,含油砂体则是钻探的有利目标。运用密度反演和地震属性融合方法确定多个有利目标发育区,揭示了该区具有良好的油气勘探前景。

In order to expand the prospecting achievements in Cretaceous strata of Shinan area in Junggar basin,stratigraphical classification and hydrocarbon accumulation condition analysis are re-performed for Qingshuihe formation by the comprehensive use of seismic forward modeling,seismic inversion and seismic attribute etc.Both sedimentary cycle and logging curve are used to determine the marker bed,based on which a unified framework of the whole area is established through the integration of well logs and seismic data,and the ancient landform during the deposition of the first member of Qingshuihe formation is characterized.Gullies developed in Shinan area control the distribution of sedimentary facies and good-quality reservoirs are found in the down-incised scour channels.Reservoir prediction and hydrocarbon detection can prove that good-quality reservoir with a floor is the first condition for oil and gas accumulation and oil-bearing sandbody is the favorable target for drilling.Multiple favorable targets are determined by using density inversion and seismic attribute fusion methods,which reveals the good oil and gas exploration prospects in the area.