鄂尔多斯盆地中山川地区延长组长6沉积微相和层序地层学研究

【作者】 李文斌；

【导师】 林晋炎；

【作者基本信息】 西北大学 ， 矿物学、岩石学、矿床学， 2010， 硕士

【摘要】 本文以鄂尔多斯盆地中山川地区现有勘探开发资料为基础,充分吸收前人研究成果,以沉积学、层序地层学基本原理为指导,综合利用地球物理、地球化学等多种研究方法,结合野外露头、岩心分析、钻测井资料,系统研究了中山川地区长6油层组的沉积微相类型、沉积相平面展布规律及层序地层学特征。在参考鄂尔多斯盆地上三叠统延长组地层划分方案基础上,依据研究区标志层、岩电特性、沉积旋回等对研究区长6油层组进行了地层划分,从上到下分为长61、长62、长63三个小层。通过对研究区沉积岩的岩石类型及特征、沉积结构、构造、古生物以及测井相标志分析,确定研究区长6油层组主要为三角洲平原和三角洲前缘亚相,进一步分为三角洲平原分流河道、分流河道间和三角洲前缘水下分流河道、分流间湾、河口坝等沉积微相。结合前人资料,应用高分辨率层序地层学原理,识别研究区内延长组长4+52-长6油层组短期、中期和长期基准面旋回,共划分出8个短期旋回、3个中期旋回和2个长期旋回。在研究区范围内对比后建立了长6和长4+5下部地层的高分辨率层序地层格架。更多还原

【Abstract】 Based on current exploration and production data in Zhongshanchan area of Ordos Basin, and sufficiently absorbed predecessors’findings, this paper Comprehensively utilizes geophysical and geochemical means to systematically study sedimentary micro-facies types, distribution of sedimentary facies and characteristics of sequence stratigraphy of Chang6 oil formation of Zhongshanchuan area, under the guidance of high-resolution sequence stratigraphy.On the basis of stratigraphic classification of Upper Triassic in Ordos Basin. Combined with key bed, lithologic character and electric property character, cycles of sedimentation, etc,Chang6 oil formation is divided into three subzone:Chang6i,chang62,chang63.Based on the study of facies indicators of sedimentary structure, Biological characteristics and geophysical signature,Chang 6 oil formation is a delta sedimentary system, including delta plain and delta front. Delta plain can be divided into distributaries channel and inter distributaries channel, delta front can be divided into distributaries channel underwater, interdistributary, mouth bar etc.Combining with previous research, based on the basic Principles and ways of high-resolution sequence stratigraphy, the paper identifies the short term, medium term and long term base-level cycles, and divided the Chang4+52—chang6 oil formation into 8 short term,3 medium term and 2 long term base-level cycles.After correlating each of the base-level cycles, the high-resolution sequence stratigraphic framework of Chang 6 formation is defined.更多还原