莫北凸起勘探新区--M116井区三工河组二段沉积相与有利砂体预测  

Sedimentary Facies and Prediction of Favorable Sandstones of the Member 2 of Sangonghe Formation in M116 Wellblock——New Exploration Area of Mobei Arch

作　　者：张宝露[1,2] 李维锋[1,3] 袁晓光[1,3] 

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室,武汉430100 [2]地球环境与水资源学院,武汉430100 [3]地球科学学院,武汉430100

出　　处：《科学技术与工程》2015年第26期42-48,共7页Science Technology and Engineering

基　　金：国家自然科学基金项目(41302094)资助

摘　　要：位于莫北凸起的M116井区块,目前是莫北油田新的油气勘探区块,前人对其地质研究很少。通过岩心观察、粒度分析,结合测、录井资料,认为其三工河组二段发育辫状河三角洲相;并识别出辫状河三角洲前缘和前辫状河三角洲2个亚相,以及水下分流河道、支流间湾等5个微相。通过编绘单井沉积相柱状图及各小层沉积微相平面展布图,揭示了三工河组二段沉积相的纵向演化规律。认为在该时期,经历了基准面"降-升-再降-再升"的多期旋回变化,形成了两套"进积-退积"式的沉积组合;并描述各沉积微相在各小层沉积时期的平面展布形态及延伸距离。根据砂体物性统计,结合沉积微相分析及含油性观察等,认为水下分流河道砂体是研究区最有利的储集砂体,河口砂坝次之,远砂坝为非有利砂体。有利砂体的识别及其各时期平面分布范围的确定,为新区目的层开展后续油气开发提供了新的、重要的地质信息。The M116 wellblock of Mobei Arch is a new exploration area of Mobei Oilfield currently, and the ge- ological research is very little. The sedimentary facies of the Member 2 of Sangonghe Formation is Braided-river del- ta facies by the core observation and grain size analysis were considered, and which can be further divided into two sub-facies and five micro-facies. The longitudinal evolution of sedimentary facies was revealed by the single well sedimentary facies histogram and micro-facies plane distribution diagram, during the sedimentary period, the datum went through two cycle changes of ＂fall-rise-fall again-rise again＂, forming two sets of sedimentary group of ＂pro- gradation-retrogradation＂, and described the plane distribution range of every microfacies during every period. The sandstone of the underwater distributary channels was considered to be the most favorable sandstones, the mouth bar was secondly, the far bar was not good sandstones by the statistical of sandstones physical properties and analysis of microfacies and observation of oil content. The identification of favorable sandstone and determination of its planeta- ry distribution range, will offer a new and important geological information to the subsequent development for new research area.

关 键 词：莫北凸起 M116井区 三工河组二段 微相 有利砂体 

分 类 号：TE122.1[石油与天然气工程—油气勘探]