海拉尔塔木察格盆地复杂断块油藏精细油层对比及沉积特征分析  

Analysis of fine oil reservoir correlation and sedimentary characteristics of complex fault block reservoirs in Hailer Tamtsag basin

作　　者：高华娟[1] 李家玮 张荻楠[1] Gao Huajuan;Li Jiawei;Zhang Dinan(Exploration and Development Research Institute of Daqing Oilfield Company Limited,Daqing,Heilongjiang 163712,China;Missouri University of Science and Technology,Rolla,Missouri 65401,USA)

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [2]密苏里科技大学,密苏里罗拉65401

出　　处：《东北石油大学学报》2018年第4期40-51,84,125,126,共15页Journal of Northeast Petroleum University

基　　金：国家科技重大专项(2011ZX05013-006)

摘　　要：海拉尔塔木察格盆地断块破碎、岩性复杂,受断裂体系、地层超覆和剥蚀影响,地层分布和储层沉积复杂,油层对比和砂体刻画难度大。通过构造对比及沉积过程分析,确定研究区不整合及不同期次基准面旋回,建立四级标志层体系,在地层缺失类型识别和沉积模式指导下,实现油层的等时划分对比;通过沉积物源、水动力条件、岩性、成熟度及沉积构造分析,建立塔木察格盆地扇三角洲、辫状河三角洲和滑塌浊积扇沉积模式,分析小层及单砂体沉积微相、储层沉积特征和油层发育规模。结果表明:在各沉积体强水动力条件下,研究区水下河道为主要富砂带,砂岩厚度大,分布规模广,由湖盆周边向中心延伸,顺物源方向逐渐分叉变窄,厚度减薄。受快速沉积和湖浪作用的影响,水道前缘发育规模较小的席状砂,河口坝不甚发育。该结果为认识开发井网条件下储层对应关系、明确海拉尔塔木察格盆地的沉积类型提供指导。Hailer Tamtsag basin is characterized by complex broken blocks and complex lithology.Affected by fracture system,stratigraphic overlying and denudation,stratigraphic distribution and reservoir sedimentation are complicated,and oil layer correlation and sand body characterization are difficult.In order to better understand the sedimentary characteristics and development scale of oil layer in the Hailer Tamtsag basin,through the analysis of tectonic contrast and sedimentary process,the unconformity and the base level cycle of different periods are determined,and the four level marker system is established.Under the guidance of identification of the type of formation deletion and sedimentary model of formation deletions,the isochronous division and correlation of oil layers can be realized.Through analysis of sediment source,hydrodynamic condition,lithology,maturity and sedimentary structure,we established the depositional models of fan delta,braided river delta and slump turbidity fan in the Hailer Tamtsag basin,and studied the sedimentary microfacies of small layer and single sand body.The results show that the underwater channel under the strong hydrodynamic conditions of each sedimentary body is the main sand belt with the characteristics of large sandstone thickness and wide distribution.From the periphery of the lake basin to the center,the sand bodies gradually narrow and their thickness decreases along the source direction.Affected by rapid deposition and wave action,the front edge of the channel develops a small scale sheet sand,and the mouth bar is not very well developed.Therefore,by means of fine oil layer correlation method and comprehensive analysis of sedimentary characteristics,This analysis can guide the correct understanding of corresponding relations of reservoirs under the condition of developing well pattern,and determine the sedimentary type of the Hailer Tamtsag basin.

关 键 词：沉积特征 复杂断块油藏 油层对比 标志层 地层缺失 扇体沉积 海拉尔塔木察格盆地 

分 类 号：TE121.3[石油与天然气工程—油气勘探]