利用测井资料精细评价特低渗透储层有利沉积微相带——以AS油田沿河湾地区长6特低渗透储层评价为例  

Refined Evaluafionof Favorable Sedimentary Microfacies Tract of： Extra-Low Permeability Reservoir Using Log Information Taking the Chang6 Extra-Low Permeability Reservoir Evaluation of Yanhewan Area in AS Oilfeild for Example

作　　者：宋子齐[1,2] 景成[1,2] 孙宝佃 成志刚 何羽飞[1,2] 张亮[1,2] 庞玉东[1,2] 田新[1,2] 

机构地区：[1]西安石油大学西部低渗一特低渗油田开发与治理教育部工程研究中心 [2]中国石油集团测井有限公司评价中心

出　　处：《低渗透油气田》2012年第1期41-45,共5页

基　　金：国家自然科学基金项目“基于核向量机的油藏历史拟合代表模型研究”（编号：40872087）;中国石油天然气股份有限公司科技攻关项目“致密气藏测井采集处理与储层评价技术研究”资助.

摘　　要：针对陕北斜坡中部AS油田沿河湾地区特低渗透储层识别主体骨架砂体微相带及筛选含油有利区工作．提出利用多种测井资料精细评价单渗砂层优势微相带，使其曲线形态、特征和数据大小能够集中反映相对高渗的单渗砂层优势微相带最大沉积能量及厚度变化，确认三角洲前缘有利沉积微相带骨架砂体的发育、规模及分布范围。通过该区长6特低渗透储层段自然电位、自然伽马、密度、中子、声波测井曲线和岩性、孔隙度及其能量厚度统计。建立起单渗砂层优势微相能量厚度下限标准，有效地提取单渗砂层优势微相带沉积能量信息．控制划分出三角洲前缘水下分流河道及其河道叠置型河口坝有利沉积微相带及其骨架砂体分布．预测和筛选出不同类型相对高渗高产含油有利区。克服了单一测井参数不能准确表征特低渗透储层中单渗砂层能量厚度的失误，特别是有效地避免了层段中几个成因相近薄砂层或砂泥互层中砂层累加厚度划分优势微相带骨架砂体及其含油有利区．为该区特低渗透油田增储上产提供有利目标和重点层位及井区。In the light of the work of identifying main framework sandbody microfacies belt and filtering tbe favorable oil-bearing areas of extra-low permeability reservoir of Yanhewan area in AS oilfeild in the middle of Northern Shaanxi Slope, the study was presented that the fine evaluation of the single permeability sand layer dominant mierofacies belt using many kinds of logging information. The curve shape, character and data size eoncentratedly reflected highest sedimentary energy and thickness alteration of the relatively high permeability single permeable sand layer dominant microfacies belt. It confirmed the sandbody development, scale and distribution range of delta front advantaged sedimentary facies. We created the criterion of h）wer limit of energy thickness of single permeable sand layer dominant microfacies belt by statistics of spontaneous potential log, natural gamma ray log, density log, neutron log, and acoustic logging curves and lithology, porosity and energy thickness of ttae extremely-low permeability Chang6 reservoirs. The favorable sedimentary microfacies belt and framework sandbody distribution in the delta front subdistributary channel and superposition river mouth bar are controlled and partitioned. Then it could forecasted favorable oil-beating areas which have relative higb permeability and production. It overcomes the fault that the single logging parameter could＇t accurately characterize single permeable sand energy thickness of extra-low permeability reservoir, especially availably avoides the fault of classifying dominant microfacies belt body sand and favorable oil-bearing areas by accumulative thickness of several sand which have close origin. The results offerred favorable target, important positions and well field for enlarging reservoirs and raising yield in extra-low permeability reservoirs.

关 键 词：测井资料 沉积环境 精细评价 沉积能量标准 单渗砂层优势微相带 

分 类 号：TE122[石油与天然气工程—油气勘探]