松辽盆地南部大情字井地区葡萄花油层地震沉积学及其应用研究

发布时间：2018-09-14 17:12

【摘要】：大情字井地区位于松辽盆地南部中央坳陷区南部,处于长岭富油凹陷中部。研究区葡萄花油层地层划分不精细,井点分布不规则,砂体具有窄、薄的特征,沉积相研究难度大,沉积特征及砂体展布规律认识不清,严重制约了油田进一步勘探开发。为此,在研究区区域沉积背景的指导下,综合运用高分辨率层序地层学原理及地震沉积学方法对葡萄花油层进行高精度等时地层格架的建立及沉积微相的精细刻画。研究区葡萄花油层沉积复杂,砂体横向变化大,井点分布不规则,等时地层对比难度大。综合利用岩心、测井、录井、地震等资料,井震结合,运用层序地层学原理、时频分析与分频解释技术,在地震上识别并追踪等时界面,将葡萄花油层划分为1个四级层序、3个五级层序和9个六级层序,建立了该区的等时地层格架。研究区葡萄花油层沉积时期,地势平缓,四级和五级层序的地层发育较为稳定,六级层序受沉积微相变化的影响,局部厚度受河道砂体发育的控制,存在横向差异性。研究区井网分布不均,井距大,开发井仅在小区域密集分布,仅仅依靠井资料难以精细刻画沉积相发育特征及砂体展布规律,论文开展了井震结合的沉积微相精细刻画方法探索。在岩心、测井分析的基础上,将地震属性分析技术、地震波形分类技术等地球物理方法与90°相位转换、地层切片、分频解释等地震沉积学关键技术相结合,对沉积微相的垂向和平面特征进行了精细描述,划分和识别了研究区7种沉积微相类型,总结了研究区砂体的三种叠置模式,提出并建立了研究区网状河三角洲沉积模式,揭示了研究区不同沉积砂体的空间展布规律。在此基础上,结合研究区葡萄花油层成藏规律和成藏特征的认识及已有试油井和邻区开发井资料,预测了葡萄花油层组的有利含油相带。论文通过开展井震结合的研究,建立了大情字井地区葡萄花油层高精度等时地层格架,精细刻画了目的层段沉积微相发育特征及砂体展布规律,预测了有利相带,为油田进一步勘探开发提供了科学依据,同时形成了适合松辽盆地网状河三角洲沉积刻画的地震沉积学研究方法。
[Abstract]:The DASIZIZHAN area is located in the south of the central depression of the southern Songliao Basin and in the middle of the Changling oil-rich depression. In the study area, the stratigraphic division of the Putaohua reservoir is not fine, the well point distribution is irregular, the sand body is narrow and thin, the study of sedimentary facies is difficult, and the understanding of sedimentary characteristics and distribution law of sand body is not clear, which seriously restricts the further exploration and development of oil fields. Therefore, under the guidance of the regional sedimentary background in the study area, the high-resolution sequence stratigraphy principle and seismic sedimentology method are used to establish the high-precision isochronous stratigraphic framework and to depict the sedimentary microfacies comprehensively. In the study area, the reservoir of Grape flower is complicated, the lateral change of sand body is large, the well point distribution is irregular, and the isochronous stratigraphic correlation is difficult. Using the core, logging, seismic and other data, combining well and earthquake, using sequence stratigraphy principle, time-frequency analysis and frequency division interpretation technology, identifying and tracing isochronous interface on earthquake, The Putaohua oil reservoir is divided into four levels, three five-order sequences and nine sixth-order sequences, and the isochronous stratigraphic framework is established in this area. In the study area, during the depositional period of the Grape flower reservoir, the topography was gentle, the stratigraphic development of the fourth and fifth order sequences was relatively stable, the sixth order sequence was affected by the sedimentary microfacies change, the local thickness was controlled by the development of the channel sand body, and there were lateral differences. In the study area, the distribution of well pattern is uneven, the well spacing is large, and the development wells are only densely distributed in small areas. It is difficult to describe the characteristics of sedimentary facies development and the rule of sand body distribution on the basis of well data alone. In this paper, the fine description method of sedimentary microfacies combined with well-shock is explored. On the basis of core and log analysis, geophysical methods such as seismic attribute analysis and seismic waveform classification are combined with key seismic sedimentology techniques such as 90 掳phase conversion, stratigraphic slicing, frequency division interpretation, etc. The vertical and plane characteristics of sedimentary microfacies are described in detail. Seven types of sedimentary microfacies in the study area are divided and identified. Three superposition models of sand bodies in the study area are summarized, and the sedimentary model of reticular river delta in the study area is proposed and established. The spatial distribution of different sedimentary sand bodies in the study area is revealed. On this basis, the favorable oil-bearing facies zone of the Putaohua formation is predicted by combining the understanding of the reservoir formation and the characteristics of the reservoir in the study area, as well as the existing data of the test wells and the development wells in the adjacent areas. Through the research of well and earthquake combination, the high precision isochronous stratigraphic framework of Putaohua oil reservoir in Dazhengzhijing area is established, and the development characteristics of sedimentary microfacies and the rule of sand body distribution in the target zone are described in detail, and the favorable facies zone is predicted. It provides a scientific basis for further exploration and development of oil fields and forms a seismic sedimentology research method suitable for the sedimentary characterization of netted river deltas in Songliao Basin.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13;P631.4

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