摘要
通过钻井、测井、录井及岩心等资料的综合分析,系统研究了鄂尔多斯盆地延长组长8段浅水三角洲沉积体系中不同类型的砂体结构特征。研究表明,砂体按成因主要分为牵引流控制的分流河道型砂体和滩坝型砂体。垂向上,可以识别出5种单砂体类型:与分流河道有关的箱型(B型)和钟型(C型)单砂体、与河口坝+远砂坝有关的漏斗型(I型)、指型(F型)和粗齿型(D型)单砂体,多层单砂体的垂向叠加型式主要包括B+B型、C+C型、B+C型、I+I型和C+I型等。横向上,可分为孤立砂体、迁移叠置砂体、连片砂体和复合砂体。平面上,主要发育网状、宽条带状、鸟足状、窄条带状、分枝状和朵状6种砂体类型。在此基础上,进一步对比探讨了不同结构类型砂体之间的连通性,纵向上,(B+B)型砂体连通性较其他类型砂体好;横向上,连片砂体的连通性相对优于其他类型;平面上,所有结构类型的砂体都具有较好的连通性。厘清浅水三角洲砂体的结构特征是储层分布预测的基础,可为浅水三角洲油气的进一步勘探开发提供有益的地质依据。
Through comprehensive study of well drilling,well logging,and core samples,the structural characteristics of different types of sand bodies in the shallow water delta sedimentary system of the Chang 8 Member of Yanchang Formation in Ordos Basin are systematically studied. The results show that sand bodies can be divided into distributary channel-type sand bodies controlled by traction flow and bar-type sand bodies related to lake waves and lake flow,based on the genesis of the sand bodies. Vertically,five main types of single sand body were identified:box-type and campaniform-type that are related to distributary-channel-type bodies,and infundibuliform-type,finger-type and dentoid-type that are related to bar-type bodies. The vertical stacked patterns of multilayer sand bodies mainly include the(Box+Box)-type,(Campaniform + Campaniform)-type,(Box + Campaniform)-type,(Infundibuliform + Infundibuliform)-type and(Campaniform + Infundibuliform)-type. Horizontally,the sand bodies are divided into isolated sand bodies,migration and stacking sand bodies,sheet-shaped sand bodies and composite sand bodies. In the plan view,there are six main types of sand bodies:mesh-shaped sand bodies,wide strip-shaped sand bodies,bird foot-shaped sand bodies,narrow strip-shaped sand bodies,branch-shaped sand bodies and flaky-shaped sand bodies. Furthermore,the connectivity of the different structural sand bodies was examined. The vertical connectivity of the(Box + Box)-type sand bodies is relatively better than other types. The lateral connectivity of sheet-shaped sand bodies is relatively better than other types. In the plan view,all types of sand bodies show reasonable connectivity. Defining the structural characteristics of sand bodies in the shallow-water deltas is the basis of prediction of the distribution reservoirs. This work provides an ideal case study for shallow-water deltas hydrocarbon exploration and development.
作者
李渊
丁熊
王兴志
李元昊
余杭航
LI Yuan;DING Xiong;WANG Xing-zhi;LI Yuan-hao;YU Hang-hang(School of Geosciences and Technology,Southwest Petroleum University,Chengdu 610500,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu 610500,China;Research Institute of Exploration and Development PetroChina Changqing Oil Field Company,Xi’an 710018,China;Exploration Department of PetroChina Southwest Oil&Gas Field Company,Chengdu 610042,China)
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2021年第1期57-72,共16页
Natural Gas Geoscience
基金
国家留学基金委项目(编号:201708515155)
中国石油科技创新基金项目(编号:2015D-5006-0107)联合资助。
关键词
砂体结构特征
浅水三角洲
长8段
延长组
鄂尔多斯盆地
Structural characteristics of sand body
Shallow-water delta
Chang 8 Member
Yanchang Formation
Ordos Basin
作者简介
李渊(1995-),男,内蒙古鄂尔多斯人,硕士研究生,主要从事油气地质研究.E-mail:liyuanmail0918@163.com;通信作者:丁熊(1981-),男,四川成都人,副教授,博士,主要从事沉积学及储层地质学研究.E-mail:xiongding@swpu.edu.cn.
