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通过地质、测井、地震资料对元坝地区须三段沉积相进行了深入细致的研究,结果表明:①元坝工区西部地层为砂岩与泥岩的不等厚互层,东部地层为底部厚套砂体与顶部泥岩的叠置层;纵向上五期砂组相互叠置.②须三段沉积时期龙门山北段、米仓山—大巴山同时为元坝工区提供物源.母岩的不同导致元坝工区发育2类砂岩,西部以钙屑砂砾岩为主,东部以岩屑石英砂岩为主.③元坝工区须三段西部发育辫状河三角洲沉积体系,垂向上呈现三角洲前缘—三角洲平原向盆地内进积的沉积序列;东部发育曲流河沉积体系,呈现三角洲前缘向盆缘退积的沉积序列.
Through the geology, well logging and seismic data, the sedimentary facies of the third member of Yuba section in Yuanba area are studied in detail. The results show that: ①The west formation of Yuanba work area is an unequal thickness interbed of sandstone and mudstone, Sandstone and top mudstone overburden; Longitudinal five sandstones superimposed on each other.②The sedimentary period of the third member of Longmen Mountains, Micangshan-Daba Mountain also provide source for the Yuanba work area.Different from the parent rock Resulting in the development of two types of sandstone in the Yuanba area, western calcareous conglomerate and eastern lithic quartz sandstone.③The braided river delta sedimentary system developed in the western part of the Xisan section of the Yuanba work area, showing the delta front vertically - Delta plains into the basin sedimentary sequence; east developed meandering river sedimentary system, showing the delta front sedimentary sequence to the basin margin deposition sequence.