豫西下冶地区上、下石盒子组三角洲旋回沉积与演化特征  

Upper and Lower Shihezi Formations Deltaic Cyclic Sedimentation and Evolutional Characteristics in Xiaye Area, Western Henan

作　　者：胡斌[1] 吴海东[1] 刘顺喜[1] 宋慧波[1] 郑德顺[1] 

机构地区：[1]河南理工大学资源环境学院,河南焦作454003

出　　处：《中国煤炭地质》2010年第1期1-5,共5页Coal Geology of China

基　　金：河南省科技计划项目(092300410167);河南省高校科技创新团队项目(2008IRTSTHN009);河南理工大学博士基金资助项目(B2009-93)联合资助

摘　　要：中二叠世至晚二叠世早期,豫西下冶地区发育了多旋回海退型河控为主的三角洲沉积体系,根据纵向上沉积特征的变化规律和从建设相开始到破坏相结束的识别标志以及旋回沉积规模,可将本区的三角洲旋回沉积划分为2个大旋回和8个中型旋回。纵向上旋回沉积的变化规律显示,该地区中二叠世至晚二叠世的沉积环境演化经历了三角洲平原—三角洲前缘—三角洲平原—三角洲前缘—前三角洲—三角洲平原的发展过程。在豫西下冶地区的三角洲旋回沉积中,厚煤层不发育,在各个煤段仅可见少量的薄煤层或煤线,这与本区在中二叠世至晚二叠世的古地理面貌(中条山和岱嵋寨隆起)及周期性分流河道的迂回变迁而造成较强的河流冲刷作用有关。During the Middle Permian to early Late Permian, a polycyclic regressive mainly fluvial-dominated deltaic sedimentary system was developed in the Xiaye area, western Henan. Based on longitudinal pattern of sedimentary characteristic variations and identification marks, cyclic sedimentation scope from the beginning of constructive facies to the end of destructive facies, the deltaic cyclic sedimentation in the area can be divided into two megacycles and eight mesocycles. The longitudinal pattern of sedimentary characteristic variation demonstrated that the sedimentary environment evolution from Middle Permian Epoch to Late Permian Epoch in the area has experienced a process from dehaic plain-delta front-deltaic plain-delta front- prodeha-dehaie plain. Thick coal seams are not well developed in the deltaic cyclic sediments in the area, only few thin coal seams and coal streaks have found in each coal-bearing sectors, it is related to rather strong fluvial scoring caused by paleogeographic features （Zhongtiaoshan and Daimeizhai uplifts） during middle to late Permian and periodic distributary channel roundabout transitions.

关 键 词：三角洲体系 旋回沉积 沉积环境 二叠系 豫西地区 

分 类 号：TE121.34[石油与天然气工程—油气勘探]