| 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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| 关键词:Songliao Basin Continental Scientific Drilling Project SK-2 East Borehole Upper Cretaceous strata geophysical logging |
| 基金项目:中国地质调查局地质调查专项(编号: 12120113017600);国家自然科学基金委重大项目专题(编号: 41790455-1);中国地质调查局公益性基础地质调查项目(编号: DD20179362) |
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| Scientific Results of Geophysical Logging in the Upper Cretaceous Strata,CCSD SK-2 East Borehole in the Songliao Basin of Northeast China |
| 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. |
| ZOU Chang-chun,ZHANG Xiao-huan,ZHAO Jin-huan,PENG Cheng,ZHANG Shu-xia,LI Ning,XIAO Liang,NIU Yi-xiong,DING Yu-jiao,QIN Yu-xing,LIN Feng.2018.Scientific Results of Geophysical Logging in the Upper Cretaceous Strata,CCSD SK-2 East Borehole in the Songliao Basin of Northeast China[J].Acta Geoscientica Sinica,39(6):679-690. |
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