松辽盆地乾东—深井子北地区三维精细构造解释及储层预测
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摘要
乾东—深井子北地区位于松辽盆地南部的长岭地区,断裂复杂,小断层发育,构造以小断层控制的断鼻和断块为主。主要目的层储层砂岩厚度较薄、横向变化快、连通性较差。进行本区的三维地震资料精细构造解释及其构造特征分析和储层预测,对于该区的油气勘探开发具有重要的意义。
     本论文以研究区三维地震资料为基础,以构造地质学和层序地层学理论为指导,从层位精细标定与地层格架建立入手,应用地震资料剖面和水平切片解释技术、本征值相干体技术、三维可视化技术、变速成图技术等技术手段,完成了本区三维地震资料的精细构造解释,发现并落实了大量的小断层、小断块和断鼻,为本区的构造特征研究、勘探目标评价及优选提供了可靠的基础资料。构造特征研究表明:研究区整体构造形态表现为一个东南高西北低的斜坡,具有“断坳双重结构”。通过对构造图和地震剖面的分析得出研究区主要断层的平面和剖面组合样式。根据断裂的活动时间、规模和对沉积、构造的控制作用,可将研究区的断裂分为三种类型。通过构造演化剖面分析认为本区的断层发育可分为三个阶段。结合区域构造背景,对研究区的断层成因机制分析认为,断陷期和坳陷期的断层都是在区域伸展应力场作用下形成的。在圈闭识别和落实的基础上,对圈闭特征进行了研究。
     针对本区主要目的层储层难以预测的难点,应用多种地震反演方法和地震属性分析技术,进行了储层特征的研究,结合精细构造解释成果,为研究区的勘探、油藏评价和油气开发提供了坚实的基础。
     通过对研究区主要目的层段的综合评价,优选出9个勘探目标。
Qian Dong-North Shen Jingzi area is located at Changling area of southern Songliao Basin. Fracture of the area is complex, small faults is developmental. Structure of the Area is concentrated in the nose fault and the block fault controlled by the small fault. Main purpose of the reservoir sandstone layers are thinner and lateral variation, connectivity is poor.3D seismic in this region to fine structural interpretation and analysis structural characteristics and reservoir forecasting, for the development of oil and gas exploration has important significance.
     This paper with 3D seismic data of studied area as the basis, structural Geology and Sequence stratigraphy theory as the guide, from the accurate calibration of the horizon and the stratigraphic framework establishment, applied techniques such as seismic data vertical profile and horizon-slice interpretation technique, eigenvalue related body technique, the 3D visualization technique, variable speed mapping technique etc, which are applied to fulfill the fine structural interpretation of 3D seismic data in studied area. A large quantities of small faults, small fault blocks and nose fault were found, which provides the reliable foundation material for study the structural characteristics of the area, evaluate and select exploration target. The study of structural characteristics show that: the overall structural features of the study area showed a slope of southeast high northwest low, with possess“double composite structure of rift and depression”. Patterns of profile and plane structures of the faults in this area are studied through the analysis of structural map and seismic section. According to the fault activity time, scale, and the control of sedimentation, structure, the fault can be divided into three types. Through the analysis of structural evolution section of faults that can be divided into three stages. Combined with regional tectonic background, through the analysis of the formation mechanism of fault in study area. Faulted phase and the depression of regional extension faults are formed under the action of stress. Based on identification and implementation of the trap, to study the characteristics of the trap.
     In consideration of the forecasting difficulties towards the main purpose layer in this area, application of a variety of seismic inversion method and seismic attribute analysis technique to study the reservoir characteristics, combined with the result of fine structural interpretation, which provides the solid foundation for exploration, reservoir evaluation, and exploit oil and gas.
     Through the comprehensive evaluation of the main purpose layers, choosing nine exploration targets.
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