摘要
高岭石亚族在塔里木盆地出现高岭石和迪开石两个种,二者具有各自的特征和形成条件。自生高岭石见于下侏罗统、三叠系、石炭系砂泥岩段和克拉2号构造储气层(下第三系、下白垩统)中,他生高岭石见于下奥陶统灰岩裂缝中;迪开石见于塔南民参1井石炭系砂岩中。根据高岭石、迪开石矿物特征分析了所在层位的沉积环境和成藏期的水体介质指出,晚泥盆世东河塘组沉积期轮南59、草2井区一带为闭塞海湾,东河1、2、4等井区则为近岸沉积,迪开石是在500℃构造热力条件下由高岭石晶体转化而来。
Kaolinite subgroup is found in Tarim basin as kaolin and dickite pieces,both have individual feature and forming con-dition.The authigenic kaolinite occurred in Lower Jurassic,Triassic,Carboniferous sand-shale member and Kela No.2gas struc-tural zone(Palaeogene and Lower Cretaceous),allothigenous kaolinite appeared in Lower Ordovician limestone cracks.The dickite is found in Carboniferous sandstone of Mincan No.1Well in southern Tarim.According to mineral features of kaolinite and dick-ite,the sedimentary environments of these horizons and water media at stage of hydrocarbon accumulation are analyzed.The re-sults suggest that Lunnan Well59to Cao-2Well Block in period of Late Devonian Donghetang formation was smothered bay en-vironment,Donghe-1,2and4Well Blocks were inshore deposition.The dickite is transformed from kaoline crystal under the condition of structural geotherm at500℃.
出处
《新疆石油地质》
CAS
CSCD
2003年第5期419-423,共5页
Xinjiang Petroleum Geology
