柴达木盆地孔隙压力分析

发布时间：2018-06-11 17:12

本文选题：柴达木盆地 + 地层压力　；参考：《东北石油大学》2017年硕士论文

【摘要】：柴达木盆地,地处青藏高原东北部,青海省西北部,蕴含着丰富的油气资源。由于该地区存在巨厚沉积地层,地下情况复杂,含有多套压力系统,地层地应力也存在各向异性现象。另外,该地区经过多次的构造运动,地质系统脆弱,在钻井过程中容易出现井塌、井漏现象,这些都使得柴达木盆地油气勘探开发的进一步发展受到很大限制。因此,对柴达木盆地重点区域的地层三压力进行准确计算分析,总结重点层位地层三压力分布特征,探讨异常高压形成并结合实钻情况进行综合分析,具有重要的工程意义。本文从柴达木盆地重点区已钻探井的钻探资料出发,建立了数据库。通过统计分析该地区已钻井的钻井复杂情况、钻头使用情况、录井岩性数据及地质构造背景资料,对该地区的地层孔隙压力等做出了初步分析。利用已钻重点探井的测井和录井资料,建立了地层孔隙压力检测剖面;通过选取近年来钻井工程比较复杂的探井进行剖析,找出了发生复杂情况的主要原因;绘制出了重点层位地层压力平面分布图和连井纵向对比图,并找出了地层压力平面与纵向分布的特征。根据柴达木盆地地质构造特点及实钻情况,再结合测录井资料和地震预测结果找出了盆地内异常压力(异常低压和异常高压)发育区带及层段,分析得出该地区各层位的异常孔隙压力形成机制,并根据超压机制对地层压力计算结果进行了校核。
[Abstract]:The Qaidam Basin, located in the northeast of the Qinghai-Tibet Plateau and northwest of Qinghai Province, is rich in oil and gas resources. Due to the existence of extremely thick sedimentary strata and complex underground conditions, there are many sets of pressure systems and anisotropy of formation stress. In addition, after many tectonic movements, the geological system is fragile, well collapse and well leakage are easy to occur in the drilling process, which make the further development of oil and gas exploration and development in Qaidam Basin greatly restricted. Therefore, it is of great engineering significance to accurately calculate and analyze the three formation pressures in the key area of Qaidam Basin, summarize the distribution characteristics of the three pressures in the key strata, discuss the formation of abnormal high pressure and carry out comprehensive analysis combined with the actual drilling situation. Based on the drilling data of wells drilled in the key area of Qaidam Basin, a database is established in this paper. Based on the statistical analysis of the drilling complexity, bit usage, logging lithologic data and geological structure background data, the formation pore pressure in this area is preliminarily analyzed. Based on the logging and logging data of the drilled key exploration wells, the formation pore pressure detection profile is established, and the main reasons for the complex situation are found through the analysis of the exploration wells which are relatively complicated in drilling engineering in recent years. The distribution map of the formation pressure plane and the vertical correlation map of the connected wells are drawn, and the characteristics of the formation pressure plane and the vertical distribution are found out. According to the geological structure characteristics and actual drilling situation of Qaidam Basin, combined with logging data and seismic prediction results, the abnormal pressure (abnormal low pressure and abnormal high pressure) developed zones and strata in the basin are found out. The formation mechanism of abnormal pore pressure in each layer of this area is obtained and the calculation results of formation pressure are checked according to the mechanism of overpressure.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE21;P618.13

【参考文献】