短轴物源型致密砂岩“甜点”储层测井划分方法初探——以大民屯凹陷西部斜坡带为例  

Preliminary discussion on logging classification of tight sandstone “sweet spot” reservoirs of short axis source type——By taking west slope belt of Damintun sag as an example

作　　者：刘兴周[1] 吴文柱[1] 孙晶莹[1] 顾国忠[1] 牟春[1] 

机构地区：[1]中国石油辽河油田分公司勘探开发研究院,辽宁盘锦124010

出　　处：《石油地质与工程》2015年第4期63-66,156,共5页Petroleum Geology and Engineering

基　　金：国家科技重大专项"辽河坳陷增储领域地质评价与勘探实践"(2011ZX05006-005)部分研究内容

摘　　要：大民屯凹陷西部斜坡带沙四段短轴物源砂砾岩体具有分选差、储集类型复杂、有效储层识别难度大等特点,针对上述难题,开展储集类型研究及控油因素分析等工作,并针对性开展自然电位幅度差的"甜点"识别方法构建工作。研究表明,结构成熟度、成分成熟度低是研究区储层致密的关键因素;本区的储层存在裂缝,渗透性控制了储集体的含油性;自然电位幅度差能够较好地表征储层渗透性的变化。通过开展单井致密砂砾岩体储层划分及分类,确定了研究区单井"甜点段"划分标准,为下步勘探奠定基础。The sandstone-conglomerate bodies from short axis source rock of Sha-4 member in west slope belt of Damintun sag have the characteristics of poor sorting,complex reservoir type and great difficulty in effective reservoir recognition.Aiming at the above problems,the research on reservoir types and oil control factor analysis,and the work on 'sweet spots' identification by spontaneous potential with poor amplitude have been carried.The results show the low maturity structure and low compositional maturity are the key factors of tight sandstone reservoirs.There exists cracks in reservoirs of the area and the oil-bearing characteristic is controlled by permeability.Poor amplitude in spontaneous potential can better reflect reservoir permeability changes.On the basis of this,the research on reservoir classification and types of sandstone-conglomerate bodies of single well has been carried out and therefore,the classification standard of'sweet spot'in the research area has been established,which provides guidance for exploration in the next step.

关 键 词：大民屯凹陷 湖相短轴物源 砂砾岩体 致密储层 “甜点段” 测井评价 

分 类 号：P618.13[天文地球—矿床学] P631.81[天文地球—地质学]