海底扇规模优质储集体的分布模式与成因分析——以上新世—更新世孟加拉扇为例  

Distribution Patterns and Genetic Analyses of Potentially Productivegood Deep-water Reservoirs:A case study from the Pliocene-Pleistocene Bengal Fan

作　　者：龚承林[1,2] 朱一杰 邵大力 郭荣涛 戈道瑶 丁梁波 齐昆 马红霞 GONG ChengLin;ZHU YiJie;SHAO DaLi;GUO RongTao;GE DaoYao;DING LiangBo;QI Kun;MA HongXia(State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;PetroChina Hangzhou Research Institute of Geology,Hangzhou 310023,China;SINOPEC Petroleum Exploration and Production Research Institute,Beijing 100083,China)

机构地区：[1]油气资源与探测国家重点实验室(中国石油大学(北京)),北京102249 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中国石油杭州地质研究院,杭州310023 [4]中国石化石油勘探开发研究院,北京100083

出　　处：《沉积学报》2023年第1期1-17,共17页Acta Sedimentologica Sinica

基　　金：横向课题(孟加拉扇深水水道—天然堤复合体沉积储层分布模式与形成机制研究,编号:2019D-4309)。

摘　　要：利用高品质3D地震资料搜索刻画深水水道—朵叶复合体的沉积构成并揭示油气储集体的分布模式对于深水油气勘探具有重要的指导意义。利用PaleoScan全三维智能解释手段和三色(RGB)混相分频技术识别解剖了孟加拉扇上新统—更新统深水水道—天然堤体系6种富砂沉积单元,包括补给水道、分支水道、似点坝、决口扇、漫溢扇和末端朵叶。研究认为:补给水道、决口扇、末端朵叶是潜在的规模且优质深水油气储集体类型;而漫溢扇、分支水道和似点坝分别是潜在的规模非优质、非优质非规模以及优质非规模深水油气储层类型。补给水道主要分布在水道—朵叶复合体的上游和中游;决口扇、漫溢扇、分支水道和似点坝主要发育在水道—朵叶复合体的中游;而分支水道和末端朵叶主要分布在水道—朵叶复合体的下游。漫溢扇向供源水道一侧楔状增厚,形成“砂盖泥”的格局;而决口扇向供源水道一侧楔状减薄直至尖灭形成“泥包砂”的格局,相应形成海底扇岩性圈闭。Research on the architecture of deep-water channel-lobe complexes and distribution patterns of potentially productive deep-water reservoirs has practical implications for deep-water hydrocarbon exploration.This study used PaleoScan-based 3D intelligent interpreting approach and RGB color blending of spectral decomposition to document five sandy deep-water elements:channel fills,distributary channel fills,point bars,crevasse splays,overbank splays,and terminal lobes.Channel fills,crevasse splays and terminal lobes are recognized as types of large-scale and high-quality deep-water reservoir,whereas distributary channel fills are considered to be a type of small-scale and low-quality deep-water reservoir.Overbank splays are interpreted as large-scale but low-quality deep-water reservoirs.Point bars are interpreted as small-scale but high-quality deep-water reservoirs.Channel fills occur along the upper and middle segments of channel-lobe complexes.Crevasse splays,overbank splays,distributary channel fills and point bars are mainly evident along the middle segments of channel-lobe complexes.Distributary channel fills and terminal lobes mainly occur along lower segments of channel-lobe complexes.Overbank splays have a wedged-shape pattern with thickness increasing towards the main feeder channels,forming sandy deposits overlain by muddy elements.Crevasse splays also exhibit wedged-shape patterns,but with thickness decreasing towards main feeder channels,forming sandy deposits blanketed by muddy elements and forming lithological traps on submarine fans.

关 键 词：水道—朵叶复合体 海底扇 规模深水储集体 分布模式 岩性圈闭 孟加拉扇 

分 类 号：P512.2[天文地球—地质学]