摘要
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。
Turbid current deposits of lacustrine facies are developed extensively from the Late Triassic to Cretaceous in northwestern China. Turbidity has the typical gravity flow sedimentary characteristics which include graded bedding, involution bedding, flute mold, delve mold, prod cast, scour mold, gravity cast, decollement fold and so on. Based on the study of the facies of field and downhole of the whole geological period, the turbid current deposits of lake facies are thought to be formed in environment of lakebed fan. Lithofacies sush as disorganized gravels (A 1), massive sandstones with dish stractures (B 1), massive sandstones (B 2), proximal turbidites (C), distal turbidites (D), irregularly interbedded sandstones and mudstones (E), slump folded layers (F), and shales and siliceous rocks (G) have been recognized in northwestern China. The inner fan, mid fan and outer fan facies associations have been summarised. The origin and significance of petroleum geology of turbid current deposits of lake facies are discussed.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2001年第1期57-62,共6页
Journal of Northwest University（Natural Science Edition）
