摘要
在松辽盆地白垩纪大陆科学钻探松科2井实施前,以钻井地质设计为基础,结合区域地层特征、地球物理资料和邻井钻探结果,参照油气勘探生产标准和经验,对松科2井钻遇主要界面深度进行预测,建立基本框架,同时预测全井段岩性序列、可能的油气水情况和故障层段,最终建立松科2井综合模拟柱状图。各主要地层界面预测深度为:嫩江组二段顶面(T_06)950m,姚家组顶面(T_1)1 245m,泉头组顶面(T_2)1 680m,登娄库组顶面(T_3)2 530m,营城组顶面(T_4)2 965m,沙河子组顶面(T_4-1)3 320m,火石岭组顶面(T_4-2)5 670m,基底顶面(T_5)6 240 m。岩性剖面的预测主要分为两部分:(1)T_4-1之上参考邻井宋深3井钻遇岩性序列;(2)T_4-1之下则根据地震剖面、其他钻遇相当层位的邻井和区域地层特征综合预测。主要目的层岩性特征如下:营城组上部为粗砂岩、砾岩、砂砾岩,下部为厚层凝灰岩、安山玄武岩、流纹岩夹泥岩,底部为砾岩;沙河子组为泥岩夹煤线、细砂岩、粉砂岩和泥质粉砂岩;火石岭组上部为凝灰岩、泥岩、英安岩和安山岩,下部为泥岩夹细-粉砂岩,含煤;基底为极低级或高级成岩的石炭—二叠系沉积地层。松科2井模拟柱状图是钻探工程施工的主要依据,同时也为其他科学钻探工程模拟柱状图的编制提供借鉴。
The simulated stratigraphic column of SK2 is the main reference for the whole scientific drilling process bases on the experience of SK1.First of all,the depth of the main formation boundaries was predicted according to structural maps,seismic profiles and adjacent wells.Secondly,we predicted the detail lithology of each member or formation,based on regional stratigraphic-lithologic characteristics,geophysical data,and well Songshen3 and other adjacent wells.Finally,the designed coring horizon,contents,oil,gas and water bearing layers,probable drilling failures etc.were integrated into the comprehensive simulated stratigraphic column of SK2.The depth of the main formation boundaries of SK2 is predicted as below:the top of the 2nd member of Nenjiang Formation(T_06)is 950 m,the top of Yaojia Formation(T_1)is 1245 m,the top of Quantou Formation(T_2)is 1680 m,the top of Denglouku Formation(T_3)is 2530 m,the top of Yingcheng Formation(T_4)is 2965 m,the top of Shahezi Formation(T_4-1)is 3320 m,the top of Huoshiling Formation(T_4-2)is5670m,and the top of basement(T_5)is 6240 m.The lithology of main target strata of SK2 are predicted as follows.Yingcheng Formation can be divided into two parts,and the upper part consists mostly of coarse sand,conglomerate,and glutinite,with mudstone as interlayers,and massive tuff,andesite-basalt and rhyolite,dominated in the lower part.The Shahezi Formation is composed mostly of dark mudstone,with sand,siltstone,silty mudstone,and coal streak as interlayers.The lithology of Huoshiling Formation possibly corresponds to regional stratigraphic-lithologic characteristics,and the upper part is mainly composed of tuff,mudstone,and dacite and andesite,while the lower part consists mostly of dark mudstone,with fine-siltstone and coal streak as interlayers.The basement probably composed of conglomerate and permian-carboniferous"metamorphic rock",which are probably very high diagenesis or very low-grade metamorphism sedimentary rocks.