古地理学报2024，Vol.26Issue(1)：58-74,17.DOI:10.7605/gdlxb.2024.01.008
滨里海盆地东缘北特鲁瓦油田石炭系层序地层与沉积演化特征
Carboniferous sequence stratigraphy and sedimentary evolution in the North Troyes Oilfield,eastern margin of the Pre-Caspian Basin
摘要
Abstract
Based on 3D seismic and borehold data,seven seismic sequence boundaries and seven drilling sequence boundaries are identified in the Carboniferous carbonate platform of North Troyes Oilfield.The KT-Ⅰ reservoir group is divided into three and a half third-order sequences,and the KT-Ⅱ reservoir group is divided into three third-order sequences.The sedimentary environment evolved stratigraphically from open platform,through restricted platform,to evaporative platform.According to the palaeo-geomor-phic restoration and sedimentary evolution within the sequence framework of the study area,the palaeo-geomorphic and sedimentary evolution of the study area can be divided into three stages:the initial phase of differential platform uplift and depression(SQ2-SQ3 sequence),the finalizing phase of differential up-lift and sedimentary differentiation fixing period(SQ4 sequence),and the inherited development phase(SQ5-SQ7 sequence).Further analysis shows that the uplift and depression pattern under the control of sequence framework controls the plan-view distribution of dolomite subclasses.The lower part of the se-quences are dominated by micritic dolomite-gypsum and micritic dolomite-micritic limestone assemblages,which are characteristic of mainly lagoonal lacustrine deposits,while the higher part of the sequences are dominated by micritic dolomites,fine micritic dolomites and residual micritic dolomites.The results show that deposition of the KT-Ⅰ oil formation in the study area results from inherited differential subsidence,rather than erosion and subsidence of the"western highland and eastern lowland"as previously thought.The overall palaeogeographical pattern is characterized by"Platform in the east,trough in the west,high in the north and low in the south",which consistently controls the development and distribution of favora-ble facies and high-quality reservoirs.This finding is vitally important in screening for hydrocarbon explora-tion and production prospects in Pre-Caspian Basin.关键词
层序地层/古地貌—沉积演化/隆坳分异/碳酸盐岩台地/石炭系/北特鲁瓦油田/滨里海盆地Key words
sequence stratigraphy/palaeogeomorphological and sedimentary evolution/differentia-tial uplift and depression/carbonate platform/Carboniferous/North Troyes Oilfield/Pre-Caspian Basin分类
天文与地球科学引用本文复制引用
陈烨菲,赵伦,侯珏,李毅,王淑琴,李建新..滨里海盆地东缘北特鲁瓦油田石炭系层序地层与沉积演化特征[J].古地理学报,2024,26(1):58-74,17.基金项目
中国石油集团公司"十四五"前瞻性基础性科技项目(编号:2022DJ3209)资助.Financially supported by the Fourteenth Five Year Plan forward looking Basic Science and Technology Project of CNPC(No.2022DJ3209) （编号:2022DJ3209）
