辽河探区西部凹陷天然气特征与分布模式  

Natural Gas Occurrence and Distribution Pattern of Western Sag of Liaohe Exploration Area

作　　者：高岗[1] 黄志龙[1] 刘宝鸿 范泓澈[1] 

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [2]中国石油辽河油田公司勘探开发研究院,辽宁省盘锦市124000

出　　处：《中国石油勘探》2011年第1期41-49,1,共9页China Petroleum Exploration

基　　金：国家重点基础研究发展计划"中低丰度天然气藏大面积成藏机理与有效开发的基础研究"(973计划2007CB209503);中国石油辽河油田公司项目"辽河探区西部凹陷油气深化勘探理论与实践"(L2007KT3)

摘　　要：针对辽河探区西部凹陷天然气分布广、油气伴生的特点,首先分析了油气相态分布、天然气地球化学特征和原油溶解气出溶特征,然后分析了天然气运聚成藏特征和模式,最后提出了天然气分布模式。在同一勘探区块,油气藏具有由下而上依次为气藏、油藏、气顶油藏和气藏的分布特征,平面上独立相态天然气主要分布于生烃凹陷主体内部不同深度,干气主要分布在生烃凹陷内的浅部及其邻近地区的斜坡部位,湿气在不同深度均有分布。其中,沙一段—沙二段的干气主要分布在生烃洼陷内及其附近,沙三段—沙四段的干气主要分布在生烃凹陷周缘的斜坡带上。原油溶解气出溶是独立相态聚集的天然气主要来源。凹陷的不同构造有4种不同的天然气成藏模式。浅层气主要富集在生烃凹陷内油藏之上的有效圈闭中,高成熟的天然气藏主要分布在深层及邻近生烃凹陷的凸起部位。The natural gas of western sag of Liaohe exploration area is widely distributed and the oil and gas are accompanied with each other.Hence this paper analyzes the migration,accumulation and distribution pattern of the natural gas combining with its composition and source characteristics,the exsolution features of crude oil dissolved gas and petroleum geology condition.Vertically,condensate gas reservoir,oil reservoir,gas cap reservoir,and gas reservoir are distributed from bottom to top successively at the same exploration area.Horizontally,natural gas is mainly distributed in the hydrocarbon generation sags.Dry gas is primarily distributed in the shallow part of the hydrocarbon generation sags and in the slope of neighborhood,while wet gas is distributed at different depths.Dry gas from the First Member to the Second Member of Shahejie Formation is mainly distributed in the hydrocarbon generation sags and their neighborhood,while the dry gas from the Third Member to the Fourth Member is mainly in the slope zone around the sags.The crude oil dissolved gas is the major source of natural gas accumulated in independent phase.There are four different types of natural gas reservoirforming patterns the sags with different structures.Shallow gas is rich in the effective traps over the oil reservoirs of hydrocarbon generation sags;the deep formation of the hydrocarbon generation depression and the salient around are important areas of high maturity natural gas exploration.

关 键 词：天然气 原油溶解气 成藏模式 西部凹陷 辽河探区 

分 类 号：TE112[石油与天然气工程—油气勘探]