陆表海高分辨率层序地层格架下的聚煤模式——以沁水盆地南部柿庄地区太原组为例  

Coal accumulation model of epicontinental sea in high-resolution sequence stratigraphic framework: a case study of Taiyuan Formation in Southern Qinshui Basin

作　　者：张月 祝彦贺 邵龙义[2] 王存武 朱学申 刘芬 康世龙 郑丽婧 陈思路 陈朝晖 ZHANG Yue;ZHU Yanhe;SHAO Longyi;WANG Cunwu;ZHU Xueshen;LIU Fen;KANG Shilong;ZHENG Lijing;CHEN Silu;CHEN Zhaohui(CNOOC Research Institute Limited,Beijing 100028,China;College of Geoscience and Surveying Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China)

机构地区：[1]中海油研究总院有限责任公司,北京100028 [2]中国矿业大学(北京)地球科学与测绘工程学院,北京100083

出　　处：《东北石油大学学报》2023年第4期82-94,I0006,共14页Journal of Northeast Petroleum University

基　　金：中国海洋石油有限公司“十四五”重大科技项目(KJGG-2022-1001);中国海洋石油有限公司综合科研项目(2021OT-XNY09)。

摘　　要：基于经典层序地层学理论,分析沁水盆地柿庄地区太原组含煤岩系高分辨率层序地层,探讨薄煤层及15号厚煤层的旋回样式,研究陆表海背景下高分辨率层序地层格架下的聚煤模式。结果表明:以煤层底面、古土壤层及沉积相转换面作为四级层序的界面,以灰岩底界或障壁砂、潟湖泥岩底界为最大海泛面,将太原组分为6个四级层序,包含12个体系域;提出含煤岩系进积非对称型、进积对称型、退积非对称型、退积对称型4种旋回样式;在缓慢海平面变化中,退积对称型旋回样式形成薄煤层和厚煤层的夹矸;在快速海侵过程中,进积非对称型、进积对称型、退积非对称型厚煤层用于解释15号煤层向陆方向、中部、向海方向的旋回样式。该结果明确陆表海背景下高分辨率聚煤模式由泥炭堆积速率和可容空间变化速率决定,为相同地质背景下煤层气勘探开发提供地质依据。Based on classical sequence stratigraphy theory,the high resolution sequence under the gentle slope epicontinental sea of coal accumulation model is researched,and the high resolution sequence of Taiyuan Formation in Shizhuang Area and the thin coals and No.15 coals sequence cycle patterns are analyzed.The results show that Taiyuan Formation were divided into 6 fourth-order sequences,including 12 system tracts,which taking the bottom of coal,paleosoil layer,facies reversal surface as the fourth-order sequence boundary,and the bottom of limestone,barrier sand,lagoon mudstone as MFS.The sequence stratigraphy was classified into four patterns:progradational non-symmetry pattern,progradational symmetry pattern,retrogradational non-symmetry pattern and retrogradational symmetry pattern.In the process of slow sea level change,thin coal seam and interlayer in thick coal are formed by progradational non-symmetry pattern.In the process of rapid transgression,progradational symmetry pattern,retrogradational non-symmetry pattern and retrogradational symmetry pattern are used to explain No.15 coal seam in continental direction,middle direction,seagoing direction.Coal accumulation model is determined by the peat accumulation rate and accommodation creation rate.The research results can provide geological theoretical basis for the exploration and development of coaled methane.

关 键 词：陆表海 高分辨率 层序地层 含煤岩系 聚煤模式 沁水盆地 太原组 

分 类 号：TE122[石油与天然气工程—油气勘探] P618.13[天文地球—矿床学]