尼日尔Termit盆地东北部上白垩统Donga组烃源岩发育影响因素与发育模式  

Influencing factors and development pattern of source rock from Donga Formation of the Upper Cretaceous in the Northeastern Termit Basin,Niger

作　　者：宋换新[1,2] 李巨露 文志刚 程顶胜 袁圣强[3] SONG Huanxin;LI Julu;WEN Zhigang;CHENG Dingsheng;YUAN Shengqiang(Cooperative Innovation Center of Unconventional Oil and Gas,Yangtze University,Wuhan 430100,Hubei;College of Resources and Environment,Yangtze University,Wuhan 430100,Hubei;Petrochina Research Institute of Petroleum Exploration and Development,Beijing 100083)

机构地区：[1]长江大学非常规油气省部共建协同创新中心,湖北武汉430100 [2]长江大学资源与环境学院,湖北武汉430100 [3]中国石油勘探开发研究院,北京100083

出　　处：《长江大学学报（自然科学版）》2024年第6期23-33,共11页Journal of Yangtze University(Natural Science Edition)

基　　金：国家自然科学基金项目“金刚烷类在煤岩热演化过程中形成与转化”(41502133)。

摘　　要：上白垩统Donga组是Termit盆地Trakes斜坡新确认的重要烃源岩层位,对其发育机理进行深入研究对该区油气成藏规律认识和勘探突破有重要意义。在该区三口探井Donga组钻、测井资料综合分析及采样分析的基础上,对Trakes斜坡及周缘地区Donga组优质烃源岩发育的影响因素进行了分析,并建立其发育模式。结果表明:Termit盆地Trakes斜坡及周缘地区Donga组优质烃源岩十分发育,有机质丰度高,有机质类型为混合型(Ⅱ型),生烃潜力大;晚白垩世早期全球为典型温室气候,炎热温暖潮湿的气候条件下陆源高等植物和水生低等生物均很繁盛,为沉积水体提供充足的有机质;区域稳定的热沉降作用及全球高海平面导致持续的海侵作用,底层水体形成的弱还原性环境,为沉积有机质的保存和富集提供了良好的场所。综上建立了Donga组“陆源海相”浅海泥质陆棚优质烃源岩发育模式。The Donga Formation of the Upper Cretaceous is a newly recognized important source rock stratum in Trakes Slope belt of Termit Basin.The research of development mechanism on source rock is of great significance to the understanding of hydrocarbon accumulation rules and breakthrough of exploration in research area.Based on the comprehensive analyses of drilling and logging data,as well as sample analysis data from three exploration Wells in Donga Formation,the influencing factors and development pattern of source rock were studied.The results show that the high-quality source rocks of Donga Formation are well developed in Trakes slope,the abundance of organic matter and the potential of hydrocarbon generation is high,and the organic matter type is mixed type(TypeⅡ).In the early Late Cretaceous period,the global climate was typical greenhouse,and terrigenous higher plants and aquatic bacteria and algal organisms flourished under the hot to warm and humid climate conditions,which provided sufficient organic matter for sedimentary water.The regional stable continuous thermal subsidence and the global high sea level lead to continuous transgression,and the bottom water body formed weak reduction environment,which provided a favorable zone for the preservation and enrichment of sedimentary organic matter.And the development pattern of high-quality source rocks in the terrigenous and shallow sea pelitic shelf facies of Donga Formation was established.

关 键 词：烃源岩 Donga组 发育模式 保存条件 地球化学 Termit盆地 

分 类 号：TE122.113[石油与天然气工程—油气勘探]