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文昌B凹陷差异伸展-走滑机制及控藏作用研究
投稿时间:2019-06-25  修订日期:2020-03-31  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020205
摘要点击次数: 53
全文下载次数: 64
作者单位E-mail
江汝锋 中海石油中国有限公司湛江分公司 jiangrf2@cnooc.com.cn 
周家雄 中海石油中国有限公司湛江分公司  
杨希冰 中海石油中国有限公司湛江分公司  
游君君 中海石油中国有限公司湛江分公司  
李珊珊 中海石油中国有限公司湛江分公司  
陈林 中海石油中国有限公司湛江分公司  
张霞 中海石油中国有限公司湛江分公司  
基金项目:国家科技重大专项“南海西部海域低渗油藏勘探开发关键技术”(编号 2016ZX05024-006)
中文摘要:为查明文昌B凹陷油气富集差异性的原因,基于断裂展布和形成期次、构造样式组合、构造演化和断层活动的差异等标志,建立了差异伸展-走滑机制,识别出19洼为伸展-强走滑、14洼为伸展-中等走滑、30洼为伸展-弱走滑。差异伸展-走滑作用控制了优质烃源岩的展布和供烃方向,控制输导体系类型和运移动力,提供物源通道和改造储层,还控制了圈闭类型和力学性质。进一步深化了走滑增压理论,基于先存断裂形态、伸展应力场右旋演化和应变差异,建立了走滑增压圈闭识别方法,识别出S型增压、右行左阶增压、斜交型增压3种走滑增压构造。研究表明,文昌B凹陷的油气富集受伸展-走滑构造背景、源-运时空配置关系所控制,强—中等走滑变形、发育优质中深湖源岩的文昌19洼和14洼是油气富集区。该研究成果成功推动了文昌凹陷近期的多个勘探发现。
中文关键词:差异伸展-走滑  控藏作用  走滑增压  文昌凹陷  珠三坳陷  珠江口盆地西部
 
The different extension and strike-slip mechanism and its accumulation controlling effect in Wenchang B sag
Author NameAffiliationE-mail
Jiang Rufeng Zhanjiang Branch of China National Offshore Oil Corporation CNOOC Limited jiangrf2@cnooc.com.cn 
Zhou Jiaxiong Zhanjiang Branch of China National Offshore Oil Corporation CNOOC Limited  
Yang Xibing Zhanjiang Branch of China National Offshore Oil Corporation CNOOC Limited  
You Junjun Zhanjiang Branch of China National Offshore Oil Corporation CNOOC Limited  
Li Shanshan Zhanjiang Branch of China National Offshore Oil Corporation CNOOC Limited  
Chen Lin Zhanjiang Branch of China National Offshore Oil Corporation CNOOC Limited  
Zhang Xia Zhanjiang Branch of China National Offshore Oil Corporation CNOOC Limited  
Abstract:To find out the reason for hydrocarbon enrichment differences in Wenchang B sag, based on fault distribution and formation periods, structural styles and combination, the difference of tectonic evolution and fault activity, the different extension and strike-slip mechanism was built, identified that Sub-sag 19 was in extension and strong-strike-slip setting, Sub-sag 14 in extension and medium-strike-slip setting, and Sub-sag 30 in extension and medium-strike-slip setting. The different extension and strike-slip provided source channels and reformed reservoirs, also controlled the distribution and expelling direction of excellent source rocks, the carrier system types and migration dynamic, the trap types and mechanical property. Moreover, based on pre-existing fault form, dextral evolution of extensional stress field and strain difference, the recognition method of strike-slip stress-increased traps was built, divided in 3 type such as S-shaped stress-increased traps, dextral left-step stress-increased traps, and skew-shaped stress-increased traps. In conclusion, the hydrocarbon enrichment in Wenchang B sag was controlled by extension and strike-slip setting and source-migration configuration, Sub-sag 19 and 14 were hydrocarbon enrichment region owing to stong-medium strike-slip setting and excellent source rocks in semideep lacustrine facies. Finally, the study achievement had promoted several exploration discoveries in Wenchang sag.
keywords:different  extension and  strike-slip, accumulation  controlling effect, strike-slip  stress-increased, Wenchang  Sag, Zhu-3 Depression, Western  Pearl River  Mouth Basin
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