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松辽盆地大陆科学钻探工程已经进行了十余年(2005—2016),松科1井于2007年完钻,松科2井于2014年开钻,预计2017年底完钻。该工程的目标是通过实施“2井4孔”钻探,打穿松辽盆地白垩系,获取万米连续高分辨率的陆相地质记录,用以研究白垩纪时期的温室气候变化,以期更好地应对全球变暖使人类面临的挑战。据此确定松科2井的选址原则:地层沉积记录连续;以沉积岩为主,尤其是以湖相细碎屑岩为主;厚度尽可能薄;构造简单;地面施工条件好。松科2井选在松辽盆地徐家围子断陷中沙河子组湖相泥岩最为发育的宋站地区。钻探主要目的层为下白垩统断陷层序的营城组、沙河子组和火石岭组。钻遇主要岩性为含火山岩和火山碎屑岩的砂岩、粉砂岩、泥岩、煤层互层序列,以河湖相反映还原环境的暗色岩系为主。期间穿过断陷层顶(T_4)、底(T_5)界面,上下白垩统界面和白垩系/侏罗系(K/J)界面等反映区域构造-成盆作用的重要地质界线,还会取得与白垩纪超静磁带(CNS)和全球大洋缺氧事件(OAE-1)等重要地质事件相对应的连续岩心记录。
The Songliao Basin Continental Scientific Drilling Project has been underway for more than ten years (2005-2016). The Songke 1 well was drilled in 2007 and the Songke 2 well was drilled in 2014 and is expected to be completed by the end of 2017. The goal of the project is to drill through the Cretaceous of the Songliao Basin by means of drilling “4 holes” of “Well 2” to obtain continuous high-resolution continental geological records of 10,000 meters to study the climate change in the Cretaceous during the period of To better respond to the challenges humankind faces due to global warming. Based on this, the principle of site selection of Songke-2 well is confirmed: the sedimentary records of the strata are continuous; the sedimentary rocks are the main ones, especially the lacustrine fine clastic rocks; the thickness is as thin as possible; the structure is simple; the construction conditions are good on the ground. Songke Well 2 is the Songzhan area with the most developed lacustrine mudstone in the Shahezi Formation in the Xujiaweizi Fault Depression, Songliao Basin. The main purpose of drilling is the Yingcheng Formation, Shahezi Formation and Huoshiling Formation in the Lower Cretaceous rifting sequence. The main lithology is sandstone, siltstone, mudstone and coal seam interbedded with volcanic rocks and volcaniclastic rocks, and the dark rock series are mainly reflected by rivers and lakes. During this period, geological boundaries that reflect regional tectonic-to-basin functions are also obtained through the T 4, T 5, Upper Cretaceous and Cretaceous / Jurassic (K / J) interfaces, Continuous core records corresponding to important geological events such as Cretaceous ultra-quiet (CNS) and global oceanic anoxic (OAE-1) events.