摘要
依托CSDP-2全取心井岩心及38块烃源岩样品的实测w(TOC)、w(氯仿沥青"A")、镜质体反射率、生烃潜量等一系列地化测试数据,在精确识别南黄海盆地中部隆起中—古生界沉积相类型的基础上,分析多组段、多岩相烃源岩的有机质丰度、类型和成熟度特征,并结合前人研究成果,对比该区与下扬子苏皖地区主要烃源岩的差异性,探讨南黄海盆地中—古生界油气勘探前景。结果表明:南黄海盆地在中—古生代共经历了6次较大规模的海侵-海退,由海向陆方向发育完整的浅海陆棚-障壁海岸-三角洲沉积体系且充填了浅水内陆棚、镶边碳酸盐岩台地及潮坪-泻湖和三角洲前缘等连续的沉积演化序列;海盆内栖霞组、龙潭组、大隆组和青龙组4套烃源岩品质与陆区相当,同属中等最好烃源岩级别;垂向上则以龙潭组、大隆组源岩品质最高且不乏优质烃源岩的存在,青龙组源岩品质稍低但同样有效;丰富的烃类物质基础、7套全烃、荧光高幅上升段及累计40余处油浸、油斑等直接油气显示彰显了南黄海中—古生界海相地层存在着巨大的油气勘探潜力。
Based on the cores and data of residual TOC,chloroform asphalt ＂A＂,Roand hydrocarbon generating potential and other geochemical data of 38 source rock samples from the CSDP-2 overall coring well,this paper distinguished accurately the sedimentary facies and then analysed systematically the characteristics of abundance, maturity and types of organic matter in various formation of the Mesozoic-Paleozoic in the central uplift of the South Yellow Sea basin.Furthermore,combining with the research results of predecessors,we not only compared the differences of source rocks between the sea area with Jiangsu-Anhui area,which are both in the Lower Yangtze region,but also inquired into the oil gas exploration prospect in the Mesozoic-Paleozoic of the South Yellow Sea basin.The results indicate that the South Yellow Sea had experienced 6 large-scale transgression and regression.Controlled by this mechanism,it developed shallow shelf,barrier coast,and delta depositional system and filled shallow inner shelf,rimmed carbonate platform,tidal flat lagoon and delta front and other continuous sedimentary evolution sequence in the region.The source rocks qualities of 4 sets in the sea basin,Qixia Formation,Longtan Formation,Dalong Formation and Qinglong Formation,are same as the source rocks in Jiangsu-Anhui area,which are all belong to medium-best source rock level.In vertical direction,the qualities of source rocks in Longtan and Dalong Formation are the best,where developed a large number of high-quality hydrocarbon source rocks.Besides,the source rocks in Qinglong Formation are lesser quality but also effective.Based on the above,the marine strata exists rich foundation of hydrocarbons,7 high amplitude rise sections of gas and fluorescence logging and more than 40 oil gas shows directly,which all show a great potential for oil gas exploration in the Mesozoic-Paleozoic of the South Yellow Sea basin.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2017年第4期1030-1046,共17页
Journal of Jilin University：Earth Science Edition
基金
国家海洋地质专项项目(DD20160147)
国家重点基础研究发展计划("973"计划)项目(2013CB429701)
国家自然科学基金项目(41210005)~~
关键词
CSDP-2全取心井
沉积相类型
烃源岩特征
中—古生界海相地层
南黄海盆地
CSDP-2 overall coring well
types of sedimentary facies
characteristics of source rocks
Mesozoic and Paleozoic marine strata
South Yellow Sea basin
