古辫状河心滩坝内部构型表征与建模——以大庆油田萨中密井网区为例  

Architecture characterization and modeling of channel bar in paleo-braided river:a case study of dense well pattern area of Sazhong in Daqing oilfield

作　　者：牛博[1,2] 高兴军[1] 赵应成[1] 宋保全[3] 张丹锋[1] 邓晓娟[1] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国地质大学能源学院,北京100083 [3]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《石油学报》2015年第1期89-100,共12页Acta Petrolei Sinica

基　　金：国家重大科技专项"高含水油田提高采收率新技术(二期)"(2011ZX05010-001);中国石油天然气股份有限公司油气田开发科技课题"储层精细结构表征技术与剩余油分布模式研究"(2014B-1111)资助

摘　　要：研究区位于大庆油田萨中开发区内,为中国目前井网密度最大的区域,井网密度可达280口/km2。以该地区P1-3小层辫状河砂体为研究对象,利用工区内丰富的井资料,通过对辫状河心滩坝砂体中落淤层进行单井识别和构型界面井间对比预测,对该地区地下辫状河储层砂体及其内部构型进行了精细解剖。完善了辫状河砂体构型6级层次划分方案,总结出辫状河砂体具有以"心滩坝顺流平缓前积、垂向多期增生体加积"为特点的构型沉积模式。以此为基础对辫状河储层中夹层(主要是落淤层)的产状和平面几何参数进行统计分析,建立了落淤层地质知识库。最终建立了研究区内基于三级构型界面的三维地质模型,为全区辫状河储层砂体解剖提供了切实可靠的地质依据。The study area is located in Sazhong development zone of Daqing oilfield,with the maximum well density of 280 wells/km^2 on average in China.Taking the P1-3 thin sand layer of braided river in this area as the research object,the underground reservoir sand bodies and their internal architectures are finely explored through identification of the falling-silt seams in single well and prediction analysis of architecture interface using well-to-well correlation method based on abundant actual well data.Further,the 6-level architecture classification scheme for sand bodies is improved herein;it is also concluded that the sand bodies have a sedimentary architecture model featured by gentle down-flow progradation and multi-stage vertical accretion.On this basis,statistical analyses are conducted on geometric parameters and occurrence of the interlayers（agreat majority of falling-silt seams）in braided river reservoirs,and thus a geological knowledge database about falling-silt seams is built.Finally,a three-dimensional geological model based on3-level architecture interface is set up and provides reliable evidences for exploring reservoir sand bodies of braided river in the whole area.

关 键 词：辫状河 构型模式 落淤层 地质知识库 构型建模 密井网 大庆油田 

分 类 号：TE122.14[石油与天然气工程—油气勘探]