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临清坳陷石炭—二叠纪地层特征与分布
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摘要
本论文对临清坳陷东部地区钻遇古生界的14口钻井岩性特征进行了初步研究,运用综合地层学的方法,综合岩石地层、生物地层、测井地层和地震地层,总结了研究区石炭-二叠纪地层特征;再结合前人对石炭系、二叠系界线的研究成果,提出了临清坳陷东部石炭系、二叠系的年代地层划分依据,得出研究区石炭系与二叠系的界线在太原组内部的Streptognathodus elongates-S.wabaunsensis-S.gracilis组合带的底界,大致相当于Pseudoschwagerina带的底界;同时总结了研究区地层划分与对比重要的标志层。对单井利用生物演化序列、测井和地震资料识别标志层,利用综合地层学的方法标定单井的岩性、生物演化特征;然后由地层的划分扩展到各井之间的地层的对比,辅助于地震地球物理法,由各井间的岩性特征对比来标定地震剖面,在“线”上来控制岩层的展布,绘出地层对比柱状图;进而从“面”上确定临清坳陷本溪组、太原组、山西组和下石盒子组、上石盒子组的分布,绘出残留厚度图;在此基础上结合勘探井岩心统计数据绘出临清坳陷东部煤层与暗色泥岩厚度分布图;确定研究区在石炭-二叠纪沉积过程中共存在着两个沉积中心,分别位于德州凹陷东北部与高唐-堂邑凸起中部;煤与暗色泥岩等烃源岩的沉积中心位于研究区南部的莘县凹陷;而下石盒子组与上石盒子组这两个重要的储层沉积中心在中部的高唐-堂邑凸起。
This paper has a preliminary study on lithologic characteristics of 14 bore wells which encountered Palaeozoic in the eastern area of Linqing Depression, utilizes the method of integrative stratigraphy, synthesizes lithostratigraphy、biostratigraphy、logged-stratigraphy and seismic stratigraphy, then summarizes Carboniferous-Permian formation characteristics of the study area. Combining predecessors' study results on Carboniferous-Permian boundary, it suggests that the Carboniferous-Permian boundary in the study area lies at the bottom of Streptognathodus elongates-S.wabaunsensis-S.gracilis Assemblage Zone in Taiyuan Formation, being approximately amount to the bottom of Pseudoschwagerina Fusulinida Zone; at the same time, it summarizes the important marker beds which are the basis of dividing and comparing strata in the study area. Biogenetic derivation sequences, logged and seismic documents are helpful to identify the marker beds, and combined stratigraphic methods are used to demarcate lithologic, biogenetic derivation characteristics of single bore well; then from dividing strata to comparing strata among several wells, with the help of seismic and geophysics methods, we compare lithologic characteristics of several well to demarcate seismic profiles, and monitor strata distribution in line, get the bar diagram of comparing strata; after that, we establish the distribution of Benxi, Taiyuan, Shanxi, Lower and Upper Shihezi Formation in cover of Linqing Depression, get thickness maps of relic; based on these and incorporated the statistic data of drill cores, we map thickness distribution graph of coal and dark mudstone in the eastern area of Linqing Depression; it is concluded that there are two depocenters in Carboniferous-Permian in the study area, selectively situated in the northeast of Dezhou sunken and the center of Gaotang-Tangyi bulge; the depocenter of hydrocarbon source rock such as coal and dark mudstone is situated in the Xinxian sunken in the south of the study area; the depocenter of two important reservoir beds (Lower and Upper Shihezi Formation) is situated in the Gaotang-Tangyi bulge in the center of the study area.
引文
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