滩海井场调查中区块物探资料的比对分析

Contrast analysis on geophysical data in offshore wellsite survey

汇总分析了大港滩海某区块井场调查资料,并考虑在历史环境条件下已知的地质变迁的可能影响,之后根据其浅地层内部的反射结构及沉积特征的变化情况进行了物探资料比对分析,来判断浅地层层序分布是否具有相似性,各层的反射界面及物质组成成份是否具有过渡性和可类比性,总结出该区块内的地质条件。依据分析结论科学地布设钻孔位置,最后结合地质勘察资料来对钻井船是否适合升船作业进行了可行性分析。结果表明:比对分析可以更为全面地得到区块内的地质条件并科学地给出地质评价,大大增强工程地质评价的准确性,同时也可对钻井船在整个区块内的就位给出相对科学的建议,提高了工作效率和节约了成本。

In this paper, the wellsite survey data in Dagang beach area was analyzed, the potential influence of known geological vicissitude was also taken into account. Based on the changes of the shallow stratum＇s reflection configuration and deposition characteristics, the eontrastive analysis on geophysical data is carried out to determine whether there exists resemblance in the distributian of shallow stratum＇ s sequence, and whether it is transitive and comparable between each stratum＇s reflection interface and material composition. Finally, the conclusions of geological condition in this area were summarized. According to the conclusions, the drilling position was set up scientifically. Eventually, combined with the geological prospeeting material, the feasibility of the drilling ship＇s operation was properly evaluated. The result shows that more corr, prehensive information about the geological eondition in this area can be derived by contrast analysis. In this way, the accuracy of engineering geological evaluation is greatly promoted, meanwhile, a relatively reasonable suggestion for drilling ship＇s location in the whole area can be obtained, and all of these ean significantly improve the working efficiency and save the cost.