松辽盆地科学钻探工程松科二井东孔上白垩统地球物理测井科学成果
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摘要
松辽盆地科学钻探工程是围绕地球深部资源、古环境与古气候等一系列重要地球科学问题而实施的重大科学工程。作为该工程的主体钻孔,松科二井东孔设计为松辽盆地最深钻孔,设计深度6 400.0 m,计划穿透白垩系地层、钻至盆地基底。由于上白垩统井段取心量非常少,因此地球物理测井的作用尤为重要。该孔正式开钻后,采用先进的成像测井设备对一开和二开钻井井段(上白垩统井段)先后实施4次裸眼井综合测井和套管井测井作业,并系统地开展测井综合评价,取得以下科学成果:(1)原位获取了常规测井、特殊测井和固井质量检查测井资料共20种,资料丰富、质量优良,建立了上白垩统连续的岩石物理参数标准剖面;(2)完成了上白垩统地层划分、岩性识别、沉积和构造精细解释;(3)识别出泉头组油气储层、嫩江组和青山口组烃源岩层、嫩江组高放射性异常层,以及上白垩统地热开发潜力层;(4)探索了青山口组古气候分析的有利测井指标;(5)及时提供准确的井径、钻孔轨迹和固井质量等关键钻探工程信息。研究成果对于松辽盆地地球物理勘探科学"标尺"建立、古环境与古气候研究、钻探工程施工起到至关重要的作用,为整个钻探工程科学目标的实现奠定良好基础。
The Continental Scientific Drilling Project in the Songliao Basin, a major scientific project, was aimed at solving a variety of scientific problems involved in resources on deep strata, paleoclimate and paleoenvironment. As the main borehole of this project, the SK-2 East Borehole was designed to reach a depth of 6 400 m to penetrate the Cretaceous strata until reaching the base of the basin. Geophysical logs played an important role in the subsequent geoscience researches because very few core samples were recovered over the Upper Cretaceous intervals(i.e., Spud 1 and Spud 2). After the borehole was officially drilled, 4 uncased and cased hole logging operations were carried out in the Upper Cretaceous intervals using advanced imaging logging tools. Comprehensive log evaluation was implemented systematically. The preliminary scientific results were summarized as follows:(1) Abundant logs including conventional logs special logs and CBL logs(more than 20 parameters) were obtained in situ, and continuous and standard petrophysical parameters profiles of the Upper Cretaceous interval were established;(2) Stratigraphic division, lithological identification and fine interpretation of sediments and structures were completed;(3) Hydrocarbon reservoirs in the Quantou Formation, source rocks in the Nenjiang and Qingshankou Formation, abnormally high radioactivity interval in the Nenjiang Formation, and potential geothermal development layers over the Upper Cretaceous strata were identified;(4) Favorable geophysical log indexes for paleoclimate analysis in the Qingshankou Formation were studied;(5) The key drilling engineering information including accurate temperature, caliper, borehole trajectory and cementing quality was provided in time. The scientific results are crucial for establishing the scientific scale of geophysical exploration in the Songliao Basin, investigating paleoclimate and paleoenvironment, and implementing drilling engineering, which have established good foundations for achieving the whole scientific goals of this drilling project.
The Continental Scientific Drilling Project in the Songliao Basin, a major scientific project, was aimed at solving a variety of scientific problems involved in resources on deep strata, paleoclimate and paleoenvironment. As the main borehole of this project, the SK-2 East Borehole was designed to reach a depth of 6 400 m to penetrate the Cretaceous strata until reaching the base of the basin. Geophysical logs played an important role in the subsequent geoscience researches because very few core samples were recovered over the Upper Cretaceous intervals(i.e., Spud 1 and Spud 2). After the borehole was officially drilled, 4 uncased and cased hole logging operations were carried out in the Upper Cretaceous intervals using advanced imaging logging tools. Comprehensive log evaluation was implemented systematically. The preliminary scientific results were summarized as follows:(1) Abundant logs including conventional logs special logs and CBL logs(more than 20 parameters) were obtained in situ, and continuous and standard petrophysical parameters profiles of the Upper Cretaceous interval were established;(2) Stratigraphic division, lithological identification and fine interpretation of sediments and structures were completed;(3) Hydrocarbon reservoirs in the Quantou Formation, source rocks in the Nenjiang and Qingshankou Formation, abnormally high radioactivity interval in the Nenjiang Formation, and potential geothermal development layers over the Upper Cretaceous strata were identified;(4) Favorable geophysical log indexes for paleoclimate analysis in the Qingshankou Formation were studied;(5) The key drilling engineering information including accurate temperature, caliper, borehole trajectory and cementing quality was provided in time. The scientific results are crucial for establishing the scientific scale of geophysical exploration in the Songliao Basin, investigating paleoclimate and paleoenvironment, and implementing drilling engineering, which have established good foundations for achieving the whole scientific goals of this drilling project.
引文
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