准噶尔盆地南缘复杂构造时深转换方法研究

发布时间：2018-09-13 10:43

【摘要】：准噶尔盈地南缘地区是新疆油田公司油气勘探的重要接替领域之一,前期已经发现了独山子油田、卡因迪克油田、呼图壁气田、玛河气田等多个油气田及霍尔果斯背斜、吐谷鲁背斜、安集海背斜、西湖背斜等多个含油气构造,油气资源丰富。准南缘地区有利目标基本上都属于山前复杂构造,普遍具有地表和地下双重复杂的特征,地震资料品质较低,利用地震速度建场后时深转换得到的构造图精度较低。对前期失利的探井分析后认为,构造落实是制约该区油气发现的重要因素,其中时深转换环节更是制约构造图精度的技术瓶颈。本次研究在分析准南缘地区时深转换方法的基础上,理清了山前复杂构造成图的问题和不足,进行了准南缘区域地震速度建场和变速成图方法研究,以南缘东部地区古牧地三维和长山1三维为精细目标落实的研究靶区,从资料处理、地震资料解释、时深转换方法研究等方面进行了系统研究,初步总结出一套适用于准南缘区域和有利目标的较高精度的时深转换方法。本次研究依托科研生产项目,分别针对地震叠前时间偏移资料、地震叠前深度偏移资料的特点出发,初步形成的构造落实技术：1、区域钻井速度分析方法；2、区域地震速度建场及变速成图方法；3、复杂构造高分辨率处理和解释技术；4、复杂构造精细速度建模技术。这些技术在南缘区域和古牧地三维区进行了应用,取得了良好的应用效果。通过本次研究,在准南缘区域进行了速度成图方法研究,在精细速度研究的靶区——古牧地三维和长山1三维区提出多个钻探目标建议并获得采纳,其中多口钻井获得油气发现和良好的油气显示,拓展了准南缘东部复杂构造的油气勘探成果。通过实钻井验证,采用本次研究中的技术方法能够有效提高复杂构造的时深转换精度,在古牧地三维和长山1三维区钻井在目的层的实钻分层与设计分层误差基本上均小于1.5%。总结在古牧地三维和长山1三维的成功应用经验,本次研究中取得的技术成果具有较强的现实推广意义,为准南缘区域范围内其他复杂构造的准确落实提供较好的技术参考。
[Abstract]:The southern margin of Yingdi, Junggar, is one of the important replacement fields for oil and gas exploration in Xinjiang Oilfield Company. Several oil and gas fields, such as Dushanzi Oilfield, Caindik Oilfield, Hutubi Gas Field, Mahe Gas Field, and Holgos anticline, have been discovered in the early stage. Tukulu anticline, Anjihai anticline and Xihu anticline are rich in oil and gas resources. The favorable targets in the quasi-southern margin area are basically complex structures in front of mountains, which generally have the characteristics of surface and underground complexity, the quality of seismic data is low, and the accuracy of the structural map obtained by time-depth conversion after seismic velocity field building is low. It is considered that the structural implementation is an important factor restricting the discovery of oil and gas in this area, and the time-depth conversion is the technical bottleneck restricting the accuracy of the structural map. Based on the analysis of time-depth conversion method in the quasi-southern margin region, the problems and shortcomings of mapping complex structures in front of mountains are clarified, and the methods of seismic velocity field construction and variable velocity mapping in the quasi-southern margin region are studied. Based on the three dimensions of paleopastoral land in the eastern part of the southern margin and the three dimensions of Changshan 1 as the research targets for the implementation of the fine target, this paper makes a systematic study on the data processing, seismic data interpretation, time-depth conversion method and so on. A set of high precision time-depth conversion methods suitable for quasi-southern margin region and favorable target are summarized. According to the characteristics of seismic prestack time migration data and seismic prestack depth migration data, the preliminary structural implementation technology: 1, regional drilling velocity analysis method is developed in this study based on scientific research and production projects. 2. Regional seismic velocity field building and variable-velocity mapping method, complex structure high-resolution processing and interpretation technology, complex structure precision velocity modeling technology. These techniques have been applied in the southern margin region and the three-dimensional area of ancient pastoral land, and good results have been obtained. Through this study, velocity mapping method was carried out in the area of the quasi-southern margin. Several suggestions for drilling targets were put forward and adopted in the target areas of the fine velocity study, namely, the three dimension of ancient pastoral land and the three dimensional area of Changshan 1. Oil and gas discovery and good oil and gas display have been obtained from many drilling wells, which extend the oil and gas exploration results of complex structures in the eastern part of the quasi-southern margin. Through the verification of real drilling, the accuracy of time-depth conversion of complex structures can be effectively improved by using the technical method in this study. The errors of solid drilling stratification and design stratification in the three dimensional zones of ancient pastoral land and Changshan 1 are basically less than 1.5. The successful application experience in the three dimensions of ancient pastoral land and Changshan 1 is summarized. The technical achievements obtained in this study have a strong practical significance and provide a better technical reference for the accurate implementation of other complex structures in the area of the quasi southern margin.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P618.13

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