松辽盆地科学钻探松科2井东孔成像测井岩心空间归位及井旁构造分析

发布时间：2018-05-10 10:42

本文选题：大陆科学钻探计划 + 松科2井东孔　；参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：科研钻探是获取地球内部的各种地质信息最直接、最有效、最可靠的途径。松科2井东孔作为松辽盆地的白垩纪大陆科学钻探工程的主体钻孔,其未采取定向取心技术。许志琴院士曾经指出,岩心资料是否准确将会很大程度上影响到科研成果的精度。因此有必要针对科研钻井对未定深、定向的岩心进行空间归位,为高精度的科学研究提供准确的深度和方位信息。论文通过收集松科2井东孔成像测井资料和岩心扫描资料,利用成像-岩心扫描图像综合处理软件开展岩心空间归位工作,完成了松科2井东孔三开井段的岩心空间归位工作并对归位结果进行了质量评级。归位结果显示,随着深度的增加,岩心校正深度误差也随之增加,符合钻杆和电缆由于拉伸产生系统误差随深度逐渐增大的规律。依照岩心空间归位质量分级标准对松科2井东孔岩心空间归位结果进行质量评定分级显示,归位质量等级在AA和AB的岩心占半数以上,表明电成像测井岩心空间归位效果整体上良好,说明该岩心空间归位方法在松科2井东孔适用性较好,为下一步的地质分析及科学研究奠定了基础。本文详细分析了不同岩性层段对归位质量的影响,研究发现,粗砂岩、砾岩及火成岩等层段岩心深度归位一般较为准确,但无法实现精确的方向定位,泥岩、泥质粉砂岩等层段岩心方向定位较为准确,而深度可能存在一定的误差。总结概括归位过程中主要的岩性、层理、裂缝等地质特征,在此基础上划分了 4种岩心空间归位典型特征,这些归位典型特征可为该地区后续的岩心空间归位工作提供参考。最后,论文结合松辽盆地徐家围子断陷带构造演化历史和地层产状分布规律,利用井震显示技术对松科2井井旁构造进行解释。结果表明,该地区构造演化分为断陷期和坳陷期两个阶段,断陷期地层受区域性的挤压改造作用影响,形成了地层倾角为14°左右,倾向为正西、南西向的鼻状构造带;坳陷期受到地质改造作用较弱,形成了地层倾角较低的沉积地层。
[Abstract]:Scientific research drilling is the most direct, effective and reliable way to obtain all kinds of geological information inside the earth. As the main drilling hole of Cretaceous continental scientific drilling engineering in Songliao Basin, the orient coring technique has not been adopted. Academician Xu Zhiqin has pointed out that the accuracy of core data will greatly affect the accuracy of scientific research. Therefore, it is necessary to locate the undetermined and oriented cores in order to provide accurate depth and azimuth information for scientific research. By collecting imaging logging data and core scanning data from the east hole of Songke 2 well, the core spatial location is carried out by using the integrated image-core scanning image processing software. The work of core space homing in the third section of east hole of Songke 2 well has been completed and the quality rating of the result of return has been carried out. The result of homing shows that the error of core correction depth increases with the increase of depth, which accords with the rule that the systematic error of drill pipe and cable due to tension increases gradually with depth. According to the quality classification standard of core spatial homing, the results of spatial homing in east hole of Songke 2 well show that the homing quality grade is more than half of the cores of AA and AB. The results show that the effect of core space homing in electroimaging logging is good on the whole, which indicates that the core spatial homing method is suitable for the east hole of Songke 2 well, which lays a foundation for further geological analysis and scientific research. In this paper, the influence of different lithologic strata on the homing quality is analyzed in detail. It is found that the depth of core in the strata such as coarse sandstone, conglomerate and igneous rock is generally more accurate, but it is unable to achieve accurate orientation, mudstone, etc. The direction orientation of the core in the shaly siltstone is more accurate, but the depth may have some errors. This paper summarizes the main geological characteristics of lithology, bedding, fracture and so on in the process of homing, and on this basis divides four typical characteristics of core spatial homing, which can provide reference for the subsequent work of core spatial homing in this area. Finally, combined with the history of structural evolution and formation occurrence and distribution law of Xujiaweizi fault belt in Songliao Basin, well seismic display technique is used to interpret the structure around well Songke 2. The results show that the tectonic evolution in this area can be divided into two stages: the faulting stage and the depression stage. The strata in the faulted period are affected by regional compressional transformation, forming a nasal structural belt with a dip angle of 14 掳and a tendency to be positive west and south west. The depressions were weak by geological transformation and formed sedimentary strata with low dip.
【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】：P631.81;P634

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