南图尔盖盆地ADM探区上侏罗统层序地层学及沉积体系研究
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摘要
南图尔盖盆地位于哈萨克斯坦中部,大部分区块勘探程度很高,岩性地层圈闭已成为储量增长的重要方向。通过录井、测井、地震层序地层综合研究,本论文建立了南图尔盖盆地ADM探区上侏罗统的层序地层格架,识别出3个三级层序界面,6个四级层序界面,并在区域上进行了层序的对比。本论文识别出两种层序界面类型:代表区域地层剥蚀的削截不整合面(SQ8/SQ7),代表构造环境转换的地层角度不整合面(SQ5/SQ6)。分析了纵向上层序的演化特征,探讨了坳陷发育时期层序的构成样式,总结了层序沉积充填及展布特征:局部隆升、剥蚀,沉积物分布局限,连续性差,相变快,垂向上沉积层序较厚。
     在充分利用前人的研究成果和勘探资料的基础上,以层序地层学理论为指导,以地震相、测井相和沉积相精细研究为重点,综合利用测井、录井、地震等资料,以区域层序地层格架和重点井高精度地层格架的建立为基础,本论文深刻揭示了ADM探区上侏罗统沉积物充填及沉积相分布规律,确定了三角洲、扇三角洲、湖泊的识别标志和各沉积相的时空展布情况,并进一步分析了各沉积相的空间组合关系,确定了沉积相的发育特征,建立了沉积相模式。
     本论文应用地震多属性分析技术,结合对已知井的研究和分析,对ADM探区上侏罗统的圈闭进行识别和预测,发现一批岩性地层圈闭,包括地层不整合遮挡圈闭、透镜体圈闭、地层超覆圈闭和砂岩上倾尖灭圈闭。结合圈闭的特征进行评价和优选,最后提出了三种类型的有利区带。不仅拓宽了探区的勘探领域,为下步勘探提供可选目标,而且为岩性地层圈闭勘探技术方法的应用积累了重要经验。
The South Turgai basin is located in the middle of Kazakhstan. Most of the basin has a high degree of exploration, and litho-stratigraphic traps have already become an important direction of increment in reserves. According to the integrated study on seismic data, well logging data and drilling cores, we established the sequence stratigraphic framework of ADM area. The upper Jurassic can be divided into three third-order sequences and six fourth-order sequences. We identified two types of sequence boundary. One was the boundary of SQ8 and SQ7, and it was truncated disconformity surface which represented stratigraphic denudation. The other one was angle disconformity surface, the boundary of SQ6 and SQ5, representing transformation of structural environment. We analyzed the sequence evolution and its constitution in depression period. We concluded the features of sequence filling, which was for local uplift and denudation, the distribution of sediments was confined, facies changed fast, with poor continuity and huge thickness.
     Based on previous study and exploration data, guided by sequence stratigraphy theory, we studied seismic facies, electrofacies and sedimentary facies carefully. On the basis of sequence stratigraphic framework of area and major wells, we discovered the distribution of sedimentary facies, and defined the identification marks of delta, fan delta and lacustrine. We also analyzed the spatial combination relationship of facies, defined the development characteristics of sedimentary system, and established sedimentary model.
     Using seismic attribute analysis and referring to study and analyses of fixed wells, we identified and forecasted traps in upper Jurassic. We discovered many types of lithostratigraphic traps, including unconformity surface-seal traps, lenticular sandstone traps, stratigraphic overlapping traps and sandstone updip pinch out traps. We evaluated and optimized these traps. At last we proposed three types of potential zone. It not only widened the exploration area and supplied with targets to be selected, but also added important experience for application of technique and method in lithostratigraphy traps exploration.
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