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通过对各地质时代不同野外及钻井剖面岩相特征的详细研究 ,认为西北地区的湖相浊流沉积均形成于湖底扇环境 ,浊积岩具粒序层理、包卷层理、槽模、沟模、锥模、刷模和重荷模以及滑塌褶皱等构造。划分出杂乱砾岩 ( A1)、具碟状构造的块状砂岩 ( B1)、块状砂岩 ( B2 )、近基浊积岩 ( C)、远基浊积岩 ( D)、不规则互层的砂泥岩 ( E)、滑塌褶皱层 ( F)及页岩、硅质岩 ( G)等岩相。同时 ,归纳出内扇、中扇及外扇相组合 ,论述了湖泊相浊流沉积的成因及石油地质意义。
Through detailed study on lithofacies characteristics of different field and drilling sections in various geologic times, it is considered that lacustrine turbidite sediments in the northwest region are formed in the sublacustrine fan environment. Turbidite has sequence stratification, Ditch mold, cone mold, brush mold and heavy charge mold and slump fold structure. (A1), massive sandstone (B1) with plate-like structure, massive sandstone (B2), near-turbidite (C), turbidite (D) Of sand and mudstone (E), slump fold (F) and shale, chert (G) and other facies. At the same time, the combination of inner fan, middle fan and outer fan is summarized, and the causes of turbidity lacustrine deposition and petroleum geological significance are discussed.