摘要
依据研究区215口探井的钻井、测井资料,运用沉积地质学、古地理学等方法,对鄂尔多斯盆地古隆起东侧吴起—志丹—甘泉地区的奥陶系马家沟组风化壳岩溶古地貌进行恢复。分别选取本溪组顶8号煤层和马家沟组马五41底部的凝灰岩层为作图基准面,综合利用古地质图法、"印模法"和"残厚法",并结合铝土岩分布数据,对研究区岩溶古地貌进行恢复。同时,根据研究区不整合面上下地层厚度的组合可以划出上薄+下薄型、上薄+下厚(相对)型、上厚+下薄(相对)型等模型,自西向东将研究区岩溶古地貌划分出2个二级古地貌单元(岩溶高地、岩溶斜坡)和3个三级古地貌单元(潜台、残丘、古沟槽)。
On the basis of drilling and logging data from the 215 wells in the study area,and by means of sedimentary geology and paleogeography methods,the weathering crust karst paleogeomorphology of Ordovician Majiagou formation in wuqizhidan-ganquan area,where is at the eastern side of paleo uplift,has been restored in Ordos Basin.Taken the No.8 coal seam at the top of Benxi formation and the tuff at bottom of Majiagou five 41 formation as the map reference plane,Comprehensive utilization of the ancient geological map method impression method and residual thickness method,combined with the data of bauxite that distributed in Ordovician.At the same time,the models can be divided into ＂up thin plus lower thin＂,＂up thin plus lower thick＂,＂up thick plus lower thin＂ according to the thickness of strata unconformity,hereby the karst palaeogeomorphology also divided into two 2-level units,i.e.karst heights and karst slopes,and three 3-level units,i.e.Hidden units,monadnock and trench,order.
出处
《非常规油气》
2016年第4期40-47,共8页
Unconventional Oil & Gas
关键词
鄂尔多斯盆地
奥陶系
风化壳
岩溶古地貌
古地貌单元
Ordos Basin
the Ordovician
weathering crust
karst palaeogeomorphology
paleogeomorphological unit
作者简介
吴海燕（1982年生），女，硕士，工程师，长期从事储层沉积学工作。邮箱：616079519@qq．com。
