华北板块晚石炭世古地貌单元划分及其聚煤规律  

Classification of paleogeomorphology units and law of coal accumulation in late carboniferous of North China Plate

作　　者：吕大炜[1,2] 魏欣伟[3] 刘海燕[1,2] 刘彬彬[1] 

机构地区：[1]山东省沉积成矿作用与沉积矿产重点实验室山东科技大学,山东青岛266510 [2]山东科技大学地质科学与工程学院,山东青岛266510 [3]中国石化股份胜利油田分公司物探研究院,山东东营257022

出　　处：《油气地质与采收率》2010年第5期24-27,共4页Petroleum Geology and Recovery Efficiency

基　　金：国家自然基金项目"海域区古近纪典型盆地煤聚积模式及转换机制研究"(40872100);中国博士后科学基金"临清坳陷及邻区煤成气储层沉积学特征研究"(20100471562);山东省自然科学基金"山东晚古生代陆表海高频层序密集段成因分析"(Y2000E07)

摘　　要：基于陆表海盆地演化的背景、沉积特征和古地理分布,研究认为华北板块晚石炭世古地貌起伏不平,并将其古地貌分成3级:一级地形起伏单元位于环阴山南麓地区,主要以三角洲、扇三角洲、河流等陆相—过渡相为主,形成的层序可划分为低水位体系域、海侵体系域和高水位体系域;二级地形起伏单元分布最为广泛,主要由障壁—泻湖和潮坪沉积体系组成,形成的层序可划分为海侵体系域和高水位体系域;三级地形起伏单元为整个板块最低处最先接受海侵的区域,主要以台地相为主,形成的层序可划分为海侵体系域和高水位体系域。在此基础上,分析了不同单元的聚煤规律。结果表明:一级地形起伏单元易形成分布局限的厚煤层,为高水位体系域成煤;二级地形起伏单元易形成分布广泛的海侵体系域薄煤层,根据古地理特征及煤层沉积组合特征可区分出海侵事件成煤和海侵过程成煤;三级地形起伏单元由于海水占据时间较长,不易形成煤层。Based on the basin evolution analysis, sedimentary characteristic and the paleogeography distribution, paleogeomorphology in the late Carboniferous of North China can be divided into three stages. The first stage of palaeogeomorphic unit lies in the South of the Yinshan, which is deposited by delta, fan delta, river and so on,and its sequence can be divided into three parts, low-stand system,transgressive system and highstand system. The second stage of palaeogeomorphic unit is the main study area,which is deposited by barrier-lagoon and tidal,and its sequence can be divided into two parts,transgressive system and highstand system. The third stage of palaeogeomorphic unit lies in the lowest of North China Plate,which is affected by transgression,so its sediments are mainly from platform sequence that can be divided into two parts, transgressive system and highstand system. Then the coal accu-mulation is analyzed,that is:the coal distribution is limited and thickening in the first stage of slope break,which is called the coal accumulation in the highstand system;the coal distribution is extensive and thin. The coal accumulation between transgressive 'event' and transgressive progress can be divided by its palaeogeography and assemble of the coal deposition. It is difficult to form coal in the third stage of palaeogeomorphic unit for that the sea exists for a long time.

关 键 词：晚石炭世 古地貌单元 海侵过程成煤 海侵事件成煤 陆表海盆地 聚煤规律 华北板块 

分 类 号：TE111.1[石油与天然气工程—油气勘探]