高校地质学报Issue(3)：114-121,8.
内蒙古二连盆地凝灰岩潜山多期风化壳形成及油气成藏效应
Formation of Multiple Episodes of Paleo-weathering Crust of Tuff-buried Hills and its Effect on Hydrocarbon Accumulation Erlian Basin, Inner Mongolia, China
摘要
Abstract
Multiple episodes of volcanic eruptions lead to the development of multiple layers of weathering crust vertically in tuff buried hill. Geochemical, petrologic and logging data jointly demonstrate the existence of multiple episodes of weathering crust in the tuff buried hill. For well Ha-31, weathering crusts were developed at 1062~1080 m and 1165~1179 m and show K, Na, Ca leaching, larger CIA index, smaller S/A index, and relatively rich Al, Fe, Mn, P, etc content which are in accordance with the response to conventional well logging. Additionally, for singe well in logging, it shows some degree of cyclicity vertically, and this kind of cyclicity can be correlated among multi-wells. Moreover, tuffs originated from different eruption periods show different structures, composition, and sizes. From above, we can conclude that tuffs were formed in multiple episodes and multiple weathered crusts were developed vertically. The effects of multiple episodes of paleo-weathering crusts of tuff buried hills on hydrocarbon accumulation include vertical reservoir of zonal distribution , weathering crust reservoirs (late weathering crusts) and inner buried reservoirs (early weathering crusts) with vertical overlay, and complex hydrocarbon accumulation mode. The proposition of multiple episodes of tuff weathering crust related reservoirs extends the volcanic hill exploration depth and provides a theoretical basis for volcanic rocks inner buried hill exploration.关键词
凝灰岩/风化壳/潜山内幕/成藏效应/二连盆地Key words
Tuff/Weathering crust/tuff buried hill/Hydrocarbon accumulation effect/Erlian Basin分类
天文与地球科学引用本文复制引用
李浩,高先志,杨德相,王会来,王苗..内蒙古二连盆地凝灰岩潜山多期风化壳形成及油气成藏效应[J].高校地质学报,2014,(3):114-121,8.基金项目
“十二五”重大研究课题“二连盆地富油凹陷深化勘探潜力与方向研究”（HBYT-YJY-2011-JS-406）资助 （）
