【摘要】 通过野外露头、钻测井、三维地震及区域地质调查等资料的综合研究发现,川东及其周缘地区下寒武统龙王庙组岩石类型以碳酸盐岩(粉晶白云岩、颗粒白云岩、泥晶灰岩和颗粒灰岩)为主,局部发育大套蒸发岩(膏岩和云质膏岩)及碳酸盐岩与碎屑岩的混合沉积;识别出局限台地相、开阔台地相、蒸发台地相和混积台地相4种沉积相类型,以局限台地相最为发育;川东及其周缘地区龙王庙组各沉积相带呈北东—南西向展布,混积台地相分布于研究区西北部,蒸发台地相集中发育在研究区西部华蓥山断裂东侧,局限台地相分布于混积台地相以东到盆地东边界以西的地区,开阔台地相分布于局限台地相以东到广海的部分地区。更多还原

【Abstract】 Based on outcrops,logging data,seismic data and regional survey reports,the main rocks of the Lower Cambrian Longwangmiao Formation in eastern Sichuan Basin and its adjacent areas carbonate rocks(i.e.,silt-sized crystalline dolostone,grain dolostone,micritic limstone and grain limestone),and some locally-developed large sets of evaporites(gypsum rock and dolomitic gypsum rock)and mixed carbonate-clastic deposits can be seen.Four types of sedimentary facies are identified fromnorthwest to southeast,i.e.,mixed platform,restricted platform,evaporitic platform and open platform,among which,the restricted platform is most widely developed.Generally,all the facies are distributed in a southwest-northeast trending.The mixed platform is mainly distributed in the northwestern study area,the evaporitic platform is mainly distributed on the eastern side of Huayingshan Fault in the western study area,and eastwards,the restricted platform and the open platform are developed respectively.更多还原