【作者】 赵东升；

【导师】 李文厚；

【作者基本信息】 西北大学 ， 矿物学、岩石学、矿床学， 2006， 博士

【摘要】 油气资源评价表明柴达木盆地西南区有着广阔的勘探前景,古近系下干柴沟组下段又是最有利的油气层系之一。但是,随着勘探的深入,勘探难度不断加大,应用新技术与新方法研究沉积体系与预测有利的砂体分布,将成为寻找隐蔽油气藏的重要手段,鉴于此开展了该项研究。 本次研究将在前人研究基础上,充分利用现有的钻井、测井、地震及分析化验资料,以高分辨率层序地层学理论为指导,运用精细地层划分对比技术,分级建立研究区高精度地层对比格架;运用重矿物的组合、稳定系数和砾岩特征及分布确定物源方向;通过对重点井的沉积相标志的深入研究,划分沉积相类型,建立了测井—录井相与沉积相之间的对应转化关系及相模式。通过多井的对比剖面的分析,深入研究储层物性特征及其与沉积相关系,运用沉积相模式,并结合三维地震的储层反演技术,预测该区有利砂体分布。 本次研究确立了该区古近系下干柴沟组下段沉积具有多物源、近物源的特点。确定了该区古近系下干柴沟组下段时期发育有冲积扇、河流、三角洲和湖泊沉积体系及沉积相的空间展布特点。首次建立了该区新近系与古近系井—震统一的高精度层序地层格架,并在等时格架下对该区古近系下干柴沟组砂体分布进行了预测,结合烃源岩、盖层、圈闭与保存条件分析,提出了七个泉、跃进一号和红柳泉地区有利砂体的分布范围。更多还原

【Abstract】 The evaluation of petroleum resource indicates that there is a wider exploration prospect in southwestern area of Qaidam basin, and where the lower member of lower Ganchaigou of Tertiary is one of the most favorable petroleum bed sets. In company with deeply exploration, applying new technologies and methods will become important to research depositional systems and prediction on favorable sandstone body.This paper on basis of studying outcomes in the past, using the drilling, logging, seismic and assaying in the lab data, apply theory of high resolution sequence stratigraphy and technology of exquisite stratigraphic correlation and classification in order to establish stratigraphic correlation framework of high resolution. Combination and stable coefficient of heavy minerals, characteristics and distribution of conglomerate are applied to ascertain source area. Through careful study on sedimentary facies markers of important wells to ascertain the types of sedimentary facies, corresponding relation of conversion between well-logging, logging and sedimentary facies, construct sedimentary facies patter. Favorable sandstone body is predicted through applying facies patter and reservoir inversion technology of 3D-seismic, in the light of outcome of multi-well analysis of profile, studies on relation between reservoir properties of matter and sedimentary facies.In conclusion, ascertained the sedimentary facies are several and close source areas. There are alluvial fans, river, delta, and lacus deposition systems, there are different distribution characteristics of sedimentary facies during the lower member of lower Ganchaigou of Tertiary.In this thesis construct consolidated stratigraphic framework between well and seismic for the first time, and predict distribution of sandstone body through the control of isochronal stratigraphic framework. Finally, combine of analysis to source rock, cap formation, trap and condition of conservation, Pointed out the distribution confines of favorable sandstone body in the area of Qigequan, Yuejinyihao and Hongliuquan on basis.更多还原