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梅河口盆地位于中国东部郯庐断裂带北段分支断裂 抚顺—密山断裂带中,该断裂带是中国东部一条重要的第三纪聚煤带。在该断裂带中发育有一系列聚煤盆地,梅河口盆地是其中较大的一个。据沉积相推测该盆地宽约5km,长约26km,总面积约150km~2。断裂带内的第三纪盆地是中国东部早第三纪裂陷作用的产物,与中国东部渤海湾盆地的演化存在着密切的关系,并处于统一的古构造应力场中,盆地的演化过程也表现出伸展与走滑的双重控制。梅河口盆地的构造演化可以划分为盆地裂陷期和盆地反转期两幕。盆地裂陷期主要在区域右旋张扭体制作用下。发生断块活动,发育一系列高角度同沉积正断层控制断块,盆地反转期主要在区域左旋压扭体制作用下,发生构造反转,致使盆地中部分同沉积正断层发生逆转,部分断凹和断隆发生转化。梅河口盆地总体沉积充填序列与中国东北晚中生代断陷盆地充填序列模式相似,可分为5段。由下向上分别为:底部粗碎屑岩段、主要含煤段、含油泥岩段、上含煤段和上部粗、细碎屑岩段。把它们进行比较可以看出,梅河口盆地充填序列的厚度明显偏小;较深水湖相段发育较薄;主要厚煤层分布于较深水湖相段下部。梅河口盆地充填序列可划分为
The Meihekou basin is located in the Fushun-Mishan fault zone of the northern segment of the Tan-Lu fault zone in the eastern part of China. The fault zone is an important Tertiary coal belt in eastern China. In the fault zone developed a series of coal-rich basin, Meihekou basin is one of the larger. According to sedimentary facies, the basin is estimated to be 5km wide and 26km long with a total area of 150km ~ 2. The Tertiary basin in the fault zone is a product of the Early Tertiary rifting in eastern China and is closely related to the evolution of the Bohai Bay Basin in eastern China and is in a unified palaeo-tectonic stress field. The evolution of the basin also Shows double control of stretching and slippery. The tectonic evolution of the Meihekou basin can be divided into two episodes of basin rifting and basin inversion. The basin rifting period is mainly under the action of dextral twisting system in the area. A series of high-angle synsedimentary faulting faults are developed, and the basin inversion phase mainly occurs in the area under the system of left-handed compression torsion, resulting in structural inversion, resulting in the reversal of some synsedimentary normal faults in the basin, Concave and broken conversion. The overall sequence of sedimentary filling in the Meihekou basin is similar to that of the late Mesozoic rift basin in northeastern China and can be divided into five sections. From bottom to top are: bottom coarse clastic rock section, main coal section, oil mudstone section, upper coal section and upper coarse and fine clastic rock section. Comparing them, it can be seen that the thickness of the filling sequence in the Meihekou Basin is obviously smaller than that in the deep-water lacustrine; the thick coal seams are mainly distributed in the lower part of the deep-water lakes. Meihekou basin filling sequence can be divided into