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准噶尔盆地滴南凸起二叠系梧桐沟组层序地层与岩性油气藏勘探
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摘要
论文在对准噶尔盆地滴南凸起勘探现状分析的基础上,明确了岩性油气藏勘探存在的主要问题,利用滴南凸起所处良好的构造位置和区内丰富的三维地震、地质与测井资料,在提高地震分辨率处理基础上,建立了滴南凸起梧桐沟组高精度层序地层格架,结合多种先进的地球物理手段,落实了二叠系梧桐沟组梧一段的沉积相带展布及砂体预测,明确沉积层序对气藏的控制作用,总结了高精度层序地层学与岩性油气藏成藏模式,预测了有利含气区带,在对有利含气砂体进行追踪与成藏综合分析基础上,优选了有利钻探目标。论文主要成果如下:
     (1)通过岩心、测井、地震以及分析化验等资料,建立了滴南凸起二叠系梧桐沟组层序地层格架,进一步对层序体系域进行了划分与对比,研究了沉积体系内的沉积相分布配置关系,揭示了探区主要气藏分布规律。研究区SQ_P3wt1高位体系域为主要产气层段,有利油气聚集区主要位于构造隆起区所发育的辫状三角洲前缘分流河道及河口砂坝上。
     (2)根据已知油气点成藏要素分析认为,研究区存在构造-岩性复合油气藏和岩性油气藏两种类型。不整合界面和断层是油气运移的主控因素,是油气藏形成的先决条件,沉积相变引起的砂体变化是控制岩性油气藏的第二因素,油气优势运移通道指向有两类:断面附近优势运移通道指向区和斜坡区鼻梁优势运移通道指向区。
     (3)在采取叠后混合相位反褶积的方法来拓展有效波的频带,使处理成果剖面分辨率明显提高,主频提高7Hz左右,频带宽度提高10-15Hz。不仅波组关系得到很好保持,而且小薄层振幅响应清晰呈现出来,充分挖掘了现有地震资料的潜力,满足了薄互层岩性油藏预测的需求。
     (4)利用地震数据体扫描技术、三维可视化雕刻技术、反演数据体的砂体追踪技术、相模式约束下的有利砂体外推解释技术等手段对二叠系梧桐沟组目的层进行储层分析和预测工作。根据已知气层外推解释及预测二叠系梧桐沟组有利砂体5个,面积47.6km~2。其中梧一段已知砂体3块,面积30.0km~2,预测2块,面积17.6km~2;结合控藏要素、油气检测及油气分布规律研究,部署建议井位5口。
     (5)滴南凸起岩性油气藏勘探首先应具有较高分辨率的三维地震资料,以三级层序体系域内的含油气砂组标定位为基础,充分利用先进的地球物理手段进行高精度的砂组沉积微相分析与预测,同时充分利用体雕刻技术、地层切片技术、地震属性技术、地震反演技术、油气检测技术等对有利含气砂体进行精细刻画和预测,结合油气成藏综合分析,优选有利岩性体,提出钻探目标。
On the basis of the analysis of current exploration in Dinan uplift of Junggar Basin, this paper clearly indicates the major problem of lithologic reservoir exploration. Dinan uplift locates at a good structure location, using the rich three-dimensional seismic, geological and well log data, and based on improving the seismic resolution, this paper established the high-resolution sequence stratigraphic framework of Wutonggou group in Dinan uplift. Combined with various advanced geophysical methods, this paper implements the sedimentary facies distribution and sand prediction of Permian Wutonggou group, clears the sedimentary sequence controlling the gas reservoir, summarizes high-resolution sequence stratigraphy and lithology hydrocarbon models, and predicts favorable gas zone. The favorable drilling targets are optimized on the basis of the favorable gas sand tracking and accumulation comprehensive analysis.The main results are as follows:
     (1)Through the cores, well loggings, seismic, and analysis assay data, we establish the high-resolution sequence stratigraphic framework of Wutonggou group in Dinan uplift, and turn on the system tracts are divided and compared. We have studied the relation of sedimentary facies distribution within the sedimentary system, and revealed the main gas reservoir distribution. In this study area, SQ_P3wt1 high-stand systems tract is the main gas production segment. The main favorable hydrocarbon accumulation zones are mainly distributed in the distributary channel sand and distributary mouth bar of braided delta front at the tectonic uplift.
     (2)According to the known analysis of hydrocarbon accumulation factor, there are structural-lithologic reservoir and lithologic reservoir in the study area. The unconformity surface and fault is the dominative factor of hydrocarbon migration, and is the prerequisite of the reservoir formation. The sedimentary facies change is the second factor controlling the lithologic reservoir in Dinan region. There are two kinds of dominant migration pathway piont areas: the point area near cross section and the point area in the nose zone of the slope area.
     (3)Using the deconvolution method of post-stack mixed phase to develop effective wave frequency bands, the profile resolution is obviously improved, main frequency increasing about 7Hz ,and the bandwidth increasing 10-15Hz. The relations of wave group in profile resolution is well maintained, and the response of small thin layer amplitude is clearly shown. Those fully exploit the potential of seismic data, and satisfy the requirements of thin interbed lithologic reservoir prediction.
     (4)Using seismic data scan technology, 3D-visualization carving, sand body tracking technology of inversion data, extrapolation interpretation of favorable sand under the restriction of the phase model and other technology are used to analyze and predict reservoir in wutonggou group. According to the known gas reservoir to explain and predict favorable gas sandbody in Permian Wutonggou group, five sand, area 46.6 km~2. Among them, there are known three sand ,area 30.0km~2, predicted two, area 17.6km~2. Combined with the elements of controlling reservoir, hydrocarbon detection and oil-gas distribution, the five proposed well locations are disposed.
     (5)The high-resolution three-dimensional seismic data should be the primary condition in Lithologic reservoir exploration. On the basis of sand bed calibration in the three-order sequences system tract, we make full use of the advanced geophysical method for the analysis and prediction of sedimentary microfacies.we take full advantage of sandbody carving, strata slicing technology, seismic attributes, seismic inversion and hydrocarbon detection technology for the fine carving and prediction of favorable gas sand. Combined with comprehensive analysis of hydrocarbon accumulation, we optimize the favorable lithology body and drilling goal.
引文
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