成熟探区精细勘探分层系区带评价方法  

Detailed assessment of a single-combination oil-gas accumulation zone in a mature exploration basin,China

作　　者：牛嘉玉[1] 姜雪竹 刘海涛[1] 蒋凌志[1] 吴小洲[1] 

机构地区：[1]中国石油勘探开发研究院

出　　处：《石油勘探与开发》2013年第1期27-35,共9页Petroleum Exploration and Development

基　　金：国家科技重大专项(2011ZX05006-005)

摘　　要：随着中国一些油气探区逐步进入勘探成熟或高成熟期,传统的多层系"复式"整体评价已不能满足老油区精细勘探的评价精度和要求,在对比国内外勘探评价体系特点和消化吸收国外"成藏组合"评价思路的基础上,提出了"分层系区带评价"的评价思路和方法。分层系区带评价由地质评价、资源量估算与综合评价优选等3大环节构成,强调按区域或次级区域盖层及与其相匹配的储集层和供烃区来划分和确定区带的评价层系,针对各评价层系,确认已钻探井的测试结果分类和已知油气藏的分布,刻画主控地质要素的边界;在主控地质因素研究和基础图件编制的基础上,对已确认主控地质要素进行"多图叠合",落实有利区带的分布范围和类型,同时明确各区带的输导通道类型和体系构成特征以及油气充注的能力,标出最有利的远景圈闭分布。渤海湾盆地歧口凹陷勘探实践结果表明:该套评价思路和方法的应用效果显著。As some basins or blocks in China,especially old oil and gas fields,have already entered the mature or highly mature stage in exploration,the old traditional assessment method that treats ＂complex horizons＂ as a whole part can not meet the high resolution and precision requirements for detailed exploration in these areas.By comparing oil-gas evaluation systems at home and abroad and considering the evaluation method for ＂play＂ abroad,a single-combination assessment method for oil and gas accumulations in high matured exploration basins were put forward.The new method,composed of geological evaluation,resources estimation and target selection,focuses on conducting a division of the assessment horizon based on a combination of a regional/sub-regional seal and its corresponding reservoirs and hydrocarbon-supplying area,confirms the test results of drilled wells and the distribution of known reservoirs,and depicts boundaries of every key geological element.Finally,these preliminary maps of key elements are overlapped to figure out the scope and type of favorable exploration targets,hydrocarbon-supplying system,channel types,charge capacities,and the most favorable prospective traps.Detailed exploration practices in Qikou depression,Bohai Bay Basin,show this evaluation method works well.

关 键 词：精细勘探 勘探评价体系 成藏组合 分层系区带评价 

分 类 号：TE122.1[石油与天然气工程—油气勘探]