论文部分内容阅读
鄂尔多斯盆地上古生界含气砂岩体主要属湖相三角洲平原分流河道沉积,具低孔低渗和高阻抗特征。针对这一地质目标,研制和总结出4类15项方法技术,建立了鄂尔多斯盆地上古生界含气砂岩体综合预测目标处理解释技术系列。该系列以面向目标的大型综合数据库为基础,计算机技术为手段,地震地层岩性处理解释技术为核心,实现了地质、测井、地震等多学科的有机结合和同一地质目标下的处理解释一体化。在AVO理论指导下,以信息论为基础,提出了一种新的测井约束多参数反演技术,可克服砂岩含气阻抗值降低而造成的岩性解释陷阱;利用不同岩性泊松比差异所形成的AVO特征响应,可以有效区分地震高阻抗层的岩性;在实际钻探效益的驱动下,采用滚动式处理解释方法,应用各种新技术,对目标砂岩储集体实施逐步深化的特征描述。经钻探检验,该技术系列较准确地预测了厚10m左右砂岩储集体的空间展布形态,砂岩体预测符合率大于70%,钻探成功率达81.8%。
The Upper Paleozoic gas-bearing sandstone in the Ordos Basin mainly belongs to distributary channel sedimentation in the deltaic plain of the lacustrine facies with low porosity and low permeability and high impedance characteristics. In response to this geological goal, four types and 15 methods and technologies have been developed and summarized, and a series of technologies for target processing and interpretation of gas-bearing sandstone bodies in the Upper Paleozoic of the Ordos Basin have been established. This series is based on large target-oriented comprehensive database, computer technology and seismic interpretation technology of lithology as the core, which realizes the multi-disciplinary integration of geology, logging and earthquakes and the processing and interpretation under the same geological target The Under the guidance of AVO theory, a new logging constrained multi-parameter inversion technique based on information theory is proposed, which can overcome the trap of lithology interpretation caused by the decrease of gas-bearing impedance value of sandstone. By using the difference of Poisson’s ratio The formation of the AVO characteristic response can effectively distinguish the lithology of the seismic high impedance layer; driven by the actual drilling benefits, using rolling processing interpretation method, the application of various new technologies, the implementation of the target sandstone reservoir characteristics of the gradual deepening of the description . After drilling test, the technology series more accurately predicted the spatial distribution of sandstone reservoirs about 10m thick. The predicted coincidence rate of sandstone bodies is more than 70% and the drilling success rate is 81.8%.