阿姆河盆地查尔朱阶地中部低幅构造天然气藏研究

通过对研究区地层、沉积相、油气丰度、油气地质特征的综合研究及对已有油气藏的解剖,建立了低幅构造天然气藏形成的地质模式并指出了油气勘探有利区带。低幅构造发现的关键是通过优化地震参数设计、野外采集参数优选和室内保真处理。本文在地质模型指导下,采用井-震联合标定技术,对地震资料进行了精细解释,发现和准确的描述了多个盐下低幅度构造,通过对其中2个圈闭的钻探,均获得了高产天然气流,发现了具底水、层状低幅西莎天然气田,同时,首次在下侏罗统砂岩发现了重要油气显示,展现了低幅度构造在查尔朱阶地勘探的重要意义。

STUDY ON THE NATURAL GAS ACCUMULATION IN LOW RELIEF STRUCTURE RESERVOIR AT MIDDLE PORTION OF CHARZHOU STEPS IN AMUDARY BASIN

This paper focuses on the Hydrocarbon accumulation in low relief structure based on the comprehensive studies of seismic data,regional stratum,sedimentary facies,abundance of hydrocarbon and the character of petroleum geology of the Karakul territory in Chardjou step of Amudarya Basin.A reservoir geological model was established and the Potential zones of oil and gas accumulation were recommended by means of analysis well data,seismic data and three existing low relief gas deposits in the Karakul.The detection of low relief structure is a systematic program,which depends on in-house seismic designing,in-field selecting acquisition parameters,processing procedure and detail interpretation,especially the high quality of original seismic data received from acquisition in the most important issue.Numerous of subsalt low relief structures were described under the guidance of the low relief reservoir geological model and the seismic data interpretation by using the method of Well-seismic combination layering.Two of the traps were drilled and two gas deposits with high well testing flowing rate were found,and one of them is Xisha layer in bottom water low-relief gas field.In addition,hydrocarbon was found in clastic rocks of the Lower Jurassic which indicates that great potential for gas exploration in future at Chardjou step.