层序地层级次对生物碎屑灰岩沉积演化的控制作用——以中东X油田Mishrif组中下段为例
Controlling effects of sequence stratigraphic orders on sedimentary evolution of bioclastic limestone:a case study of middle-lower section of Mishrif Formation in the Middle East X Oilfield
余义常 1郭睿 2李峰峰 2林敏捷 2沈博珩 2沈毅 3韩海英 2宋世琦4
作者信息
- 1. 中国石油国际勘探开发有限公司;中国石油勘探开发研究院
- 2. 中国石油勘探开发研究院
- 3. 中国石油集团川庆钻探工程有限公司地质勘探开发研究院
- 4. 中国石油国际勘探开发有限公司
- 折叠
摘要
以中东X油田Mishrif组中下段为例,综合利用地震、测井、岩心、铸体薄片及常规物性等资料,开展层序地层级次识别及层序地层级次对沉积演化的控制作用研究.结果表明:①Mishrif组发育5个三级层序和10个四级层序,中下段MB2—MC1层段对应三级层序SQ2—SQ3,包括4个四级层序,其内部发育11个五级层序和多个六级层序.②研究区发育次盆地碳酸盐开阔台地-弱镶边台地沉积,储层主要发育于台内滩和台缘滩中,按照生物碎屑类型可将滩相进一步细分为5种类型.③六级层序控制单滩体的沉积序列,五级层序控制多滩体的组合特征,四级层序决定沉积微相演化特征,三级层序决定沉积体系的演化特征.④SQ2层序的PSS3、PSS4四级层序早期为斜坡环境,发育透镜状滑塌粗粒沉积,后期发育台地边缘滩间→中能滩相沉积序列;SQ3层序的PSS5、PSS6四级层序发育台地边缘滩间→中能滩相→高能滩相沉积序列.SQ3沉积结束后形成了特殊的下切谷充填沉积.
Abstract
Based on the data of seismic,well logging,core,cast thin sections and conventional physical properties,taking the middle-lower section of Mishrif Formation in the Middle East X Oilfield as an example,the identification of sequence stratigraphic orders and the controlling effects of sequence stratigraphic orders on sedimentary evolution are studied.The results show that:(1)The Mishrif Formation is divided into 5 third-order sequences(SQ1-SQ5)and 10 fourth-order se-quences(PSS1-PSS10).The MB2—MC1 single layers in the middle-lower section of Mishrif Formation correspond to SQ2-SQ3,including 4 fourth-order sequences(PSS3-PSS6),in which multiple fifth-order and sixth-order sequences are developed.(2)Carbonate open platform-weakly rimmed platform of a sub-basin is developed in the study area,and the reservoirs mainly exist in platform margin shoals and open platform shoals.The shoal facies can be further subdivided into rudist shoal,rudist-containing bioclastic shoal,bioclastic-arene shoal,bioclastic-spherical shoal and bioclastic shoal ac-cording to bioclastic types.(3)The sixth-order sequence controls the sedimentary sequence of a single shoal body,the fifth-order controls the combination characteristics of multiple shoal bodies,the fourth-order sequence determines the evolution characteristics of sedimentary microfacies,and the third-order sequence determines the evolution characteristics of sedimentary systems.(4)In the early stage of PSS3 and PSS4 of SQ2 sequence,the two fourth-order sequences are in a platform front slope environment,with the development of lens-shaped collapsed coarse-grained sediments.In the later stage of PSS3 and PSS4,a sedimentary sequence of the platform margin intershoal→medium energy shoal is developed.The PSS5 and PSS6 of the SQ3 sequence develop a sedimentary sequence of platform margin intershoal→medium energy shoal →high energy shoal.After the completion of SQ3 sedimentation,a special incision filling sedimentation is formed.
关键词
生物碎屑灰岩/层序地层级次/沉积演化/Mishrif组/中东Key words
bioclastic limestone/orders of sequence stratigraphy/sedimentary evolution/Mishrif Formation/the Middle East引用本文复制引用
基金项目
国家科技重大专项下属课题(2017ZX05030-001)
中国石油科技重大专项(2017D-4406)
出版年
2024
国家科技期刊平台
NSTL
万方数据