CAJ | 학술논문

利用露头和岩心物性的统计资料和对羌塘盆地统一改算后的1∶50万重力资料的波谱结构分析，应用匹配滤波法分离出羌塘盆地6个构造层。通过带地形的重力反演法计算了侏罗系构造层顶底界面深度及构造层厚度，预测了羌北坳陷中5个沉积洼陷和羌南坳陷中4个沉积洼陷。这9个侏罗纪洼陷分布在中央隆起带的南北两侧，羌北坳陷侏罗纪沉积岩以海陆过渡相蒸发盐岩为主，沉积体量比羌南坳陷略小。结合地面岩矿地层分析、湖水和泉水化学测试分析和卫星遥感图像解译资料综合评价认为，羌北坳陷比羌南坳陷具有更有利的蒸发岩沉积条件，初步预测羌北坳陷 QB2和 QB3洼陷为一级有利的含钾沉积洼陷，羌南坳陷 QN1和 QN2洼陷为二级有利的含钾沉积洼陷。
이용로두화암심물성적통계자료화대강당분지통일개산후적1∶50만중력자료적파보결구분석，응용필배려파법분리출강당분지6개구조층。통과대지형적중력반연법계산료주라계구조층정저계면심도급구조층후도，예측료강북요함중5개침적와함화강남요함중4개침적와함。저9개주라기와함분포재중앙륭기대적남북량측，강북요함주라기침적암이해륙과도상증발염암위주，침적체량비강남요함략소。결합지면암광지층분석、호수화천수화학측시분석화위성요감도상해역자료종합평개인위，강북요함비강남요함구유경유리적증발암침적조건，초보예측강북요함 QB2화 QB3와함위일급유리적함갑침적와함，강남요함 QN1화 QN2와함위이급유리적함갑침적와함。
By statistical analysis of petrophysical properties of outcrop and core samples and spectral structure of 1∶ 500,000 integrated reduced gravity data,6 tectonic layers of Qiangtang Basin were identified and separated by matched filter.Gravity inversion algorithm coupled with topography was employed to caclculat the top/bottom structures and the thickness of the Jurassic tectonic layer.5 depressions in the Northen Qiangtang sag and 4 depressions in the Southen Qiangtang sag were predicated.These 9 depressions are distributed along with the periphery of central uplift belt,the sediments in the 5 depressions in Northern Qiangtang are attributed to evaporates of transitional facies with total sedimentary volume slightly less than that in Southern Qiangtang.In combination with Jurassic outcrop lithology and stratigraphy,lake and spring water geochemical data and remote sensing image interpretation the depressions in Northern Qiangtang were estimated to have more favourable conditions for halite-sylvite sedimentation than those in Southern Qiangtang.Two depressions (QB2 and QB3)in Northern Qiangtang were preliminarily evaluated as the first-rank prospective ones for evaporate sedimentation and two depressions (QN1 and QN2)in Southern Qiangtang as the second-rank ones.