塔里木盆地塔河油田中下奥陶统层控断裂发育特征与机理研究

发布时间：2018-05-12 18:34

本文选题：塔河油田 + 中下奥陶统　；参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：塔里木盆地断裂系统对于碳酸盐岩储层形成具有重要意义,中下奥陶统鹰山组和蓬莱坝组是塔河油田最重要的勘探层位。本文以中下奥陶统鹰山组和蓬莱坝组为研究对象,以层序地层学、构造地质学等为理论指导,以钻测井、三维地震资料为基础,以地震属性分析为主要技术手段,建立了一套塔河油田主干断裂和层控断裂发育模式,并对断裂发育模式的各方要素进行详细分析。通过地质和地震资料,对塔河油田中下奥陶统鹰山组、蓬莱坝组地层层序进行精细解释。将鹰山组分为鹰一段、鹰二段、鹰三段、鹰四段四个四级层序,蓬莱坝组分为蓬一段、蓬二段两个四级层序。通过对相干体属性、曲率属性、倾斜角属性等10多种地震属性的分析和对比,认为相干体属性、曲率属性的综合识别能力最优。论文以层序地层划分、断裂精细解释为基础,对断裂剖面和平面特征进行研究。塔河油田中下奥陶统断裂平面组合类型有平直状、雁列状、共轭状等,并以大型共轭断裂和平直状断裂为主。而断裂的剖面构造样式主要分为花状构造和高陡断裂构造2大类,其中花状构造根据断裂性质和断裂形态可进一步分为7种亚类,高陡断裂构造根据切入地层情况可进一步分为3种亚类。同时研究发现,塔河油田断裂具有“三分”特点,即分区性、分带性、分段性。研究区有五个断裂带,东西向发育,以研究区中部最为集中。在同一断裂带的不同位置,断距大小、构造样式等具有不同特征。在塔河油田断裂系统整体认识的基础之上,建立塔河油田中下奥陶统主干断裂和层控断裂发育模式。剖面上层控断裂的构造样式分为界面终止型和界面切入型两大类。平面上层控断裂由下至上发育密度逐渐增大,发育区由研究区中北部向中南部及东西部扩散。通过对从层序界面、岩性、岩层厚度、应力场等角度分析,鹰山组由下至上泥晶灰岩含量逐渐增多,地层厚度逐渐变薄,蓬莱坝组白云岩含量较高但受到较大地层压力。研究发现层控断裂发育强度与应力场强度、白云岩及泥晶灰岩含量成正比,与岩层厚度成反比。
[Abstract]:The fault system of Tarim Basin is of great significance to the formation of carbonate reservoir. Yingshan formation and Penglai Ba formation of middle and lower Ordovician are the most important exploration horizon in Tahe Oilfield. This paper takes Yingshan formation and Penglai Dam formation of middle and lower Ordovician as research objects, takes sequence stratigraphy and tectonic geology as theoretical guidance, takes drilling logging and 3D seismic data as the basis, and takes seismic attribute analysis as the main technical means. A set of development models of main faults and stratabound faults in Tahe Oilfield are established, and the elements of fault development model are analyzed in detail. Through geological and seismic data, the stratigraphic sequence of Yingshan formation and Penglai dam formation of middle and lower Ordovician in Tahe oilfield is interpreted in detail. The Yingshan formation is divided into four sequences: the first member, the second member, the third member and the fourth member of the fourth member, while the Penglai formation is divided into two four sequences. Through the analysis and comparison of more than 10 seismic attributes, such as coherent volume attribute, curvature attribute and tilt angle attribute, it is concluded that the comprehensive recognition ability of coherent volume attribute and curvature attribute is the best. Based on sequence stratigraphic division and fine interpretation of faults, the fault profile and plane characteristics are studied in this paper. The plane assemblages of Middle and Lower Ordovician faults in Tahe Oilfield are flat, geese, conjugate, etc, and are dominated by large conjugate faults and flat straight faults. The structural styles of the section of the faults are mainly divided into flower structure and high steep fault structure, among which the flower structure can be further divided into 7 subtypes according to the fault nature and the fault morphology. High-steep fault structures can be further divided into three subtypes according to the tangent strata. At the same time, it is found that the fault in Tahe Oilfield has the characteristics of "three parts", namely zoning, zonation and segmentation. There are five fault zones in the study area, with the most concentrated in the middle of the study area. At different locations of the same fault zone, the size of fault distance and structural style have different characteristics. On the basis of the whole understanding of the fault system in Tahe Oilfield, the development models of the main faults and the stratabound faults of the middle and lower Ordovician in Tahe Oilfield are established. The structural styles of the upper section controlled faults can be divided into two types: the interfacial termination type and the interfacial intersecting type. The density of the upper-plane controlled fault increases gradually from the bottom to the top, and the developed area diffuses from the central to the north of the study area to the central to the south and the east to the west. From the point of view of sequence interface, lithology, lithologic thickness and stress field, it is found that the content of mudstone in Yingshan formation increases gradually from the bottom to the top, the formation thickness becomes thinner, and the dolomite content of Penglai dam formation is higher but subject to greater formation pressure. It is found that the development strength of stratabound faults is directly proportional to the stress field strength, dolomite and mudstone content, and inversely proportional to the thickness of the strata.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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