鸳鸯湖矿区延安组含煤地层沉积特征及聚煤规律  

Sedimentary characteristics and coal accumulation law of Yan'an Formation coal seam in Yuanyanghu coal mine

作　　者：李建国 何伟 郑毅 

机构地区：[1]宁夏地质矿产勘查开发局,宁夏银川750021 [2]宁夏矿产地质调查院,宁夏银川750021

出　　处：《洁净煤技术》2014年第3期57-60,65,共5页Clean Coal Technology

基　　金：宁夏自然科学基金资助项目(NZ13251)

摘　　要：分析了宁夏鸳鸯湖矿区中侏罗统延安组地层沉积特征,说明其整体呈现出明显的三段式充填特点,可划分为5个岩性段和9个充填层序,各岩性段以沉积间断面或稳定煤层的顶界面作为分界。煤层沉积主要受古地理环境影响,局部受构造控制明显,沉积环境为以河流作用为主的湖泊三角洲,聚煤作用主要发生于废弃的三角洲平原上,在第1、第3岩性段形成区内具有工业价值的主要煤层。通过分析鸳鸯湖矿区延安组地层沉积环境演化及聚煤规律,说明延安组沉积特征垂向上显示浅湖三角洲体系分布在含煤地层中部,而河流体系分布在含煤地层的下部和顶端,总体上构成聚煤程度随充填演化过程具有周期性变化的特点。Analyze the Middle Jurassic Yan＇an Formation sedimentary characteristics of Ningxia Yuanyanghu coal mine.The results show a clear three layers filling features.The Yanan coal-bearing strata can be divided into five lithology members and nine infilling sequences, and boarders with sedimentary hiatus or roof of stable coal seams.Coal deposition is mainly affected by the environmental impact of ancient geography, some are obviously controlled by local tectonic.The depositional environment is fluvial-dominated delta lakes, coal accumulation occurs mainly on the abandoned delta plain, industrial seams mainly distribute in the first and third lithology members.Sedimentary charac- teristics of Yan＇an formation shows that shallow lake delta system distributes in the middle of coal-bearing strata vertically ,with river system in the lower and the top.Coal accumulation extent cyclical changes with filling evolution.

关 键 词：鸳鸯湖矿区 延安组 煤层 沉积特征 聚煤规律 

分 类 号：P618.11[天文地球—矿床学]