沙家沟裸眼井区长6储层四性特征及测井二次解释  

Secondary logging interpretation and reserve recalculation of Chang 6 reservoir in Shajiagou open hole area

作　　者：张亮 刘庆海 蔺建武 丁磊 王伟 王涛 Zhang Liang;Liu Qinghai;Lin Jianwu;Ding Lei;Wang Wei;Wang Tao

机构地区：[1]陕西延长石油(集团)有限责任公司研究院

出　　处：《国外测井技术》2023年第5期34-41,2,共9页World Well Logging Technology

摘　　要：为解决油田早期裸眼井地层砂体特征认识不足、油层识别紊乱及储层采出程度低等问题,为二次挖潜工作提供理论指导,选取甘谷驿油田沙家沟裸眼井区长6油层作为目的层。以岩心实验数据及测井数据为基础,结合《低渗-特低渗砂岩油(气)层有效厚度解释技术要求》标准(陕西省地方标准DB61/T 1177-2018)要求,开展小层砂体四性特征分析,确定储层有效厚度下限,进行测井二次解释及储量计算工作。研究结果表示:长6储层砂体主要为细粒长石砂岩,为低孔低渗储层,储层含油受沉积微相及物性控制;有效厚度下限为岩性—细砂岩以上,含油性—油斑以上,物性—Ф≥8.0%,K≥0.2×10^(-3)μm^(2),电性—Sw<58%,Rt≥38Ω·m,Δt≥220μs/m,并以此建立了测井解释图版;长6小层剩余地质储量1454.79×10^(4)t,长613、长622小层累产油量和剩余技术可采地质储量都相对较高。研究明确了研究区二次开发以长长613、长622小层为主力层位,中南部及西南部井区为挖潜重要对象。In order to solve the problems of insufficient understanding of the characteristics of sand bodies in the early open-hole wells of the oilfield,disordered identification of oil layers,and low recovery of reservoirs,the Chang6 oil layer in the Shajiagou open-hole well area of Ganguyi Oilfield was selected as the target layer to provide theoretical guidance for secondary potential tapping work.Based on core experimental data and logging data,combined with the requirements of the"Technical Requirements for Interpretation of Effective Thickness of Low Permeability to Ultra Low Permeability Sandstone Oil(Gas)Layers"standard(Shaanxi Provincial Local Standard DB61/T 1177-2018),the four characteristics analysis of small layer sand bodies is carried out to determine the lower limit of effective thickness of the reservoir,and secondary logging interpretation and reserve calculation work are carried out.The study shows that the sand body of Chang 6 reservoir in Shajiagou well area is mainly fine-grained feldspathic sandstone,which is a low porosity and low permeability reservoir.The oil content of the reservoir is controlled by sedimentary microfacies and physical properties;The lower limit of effective thickness is lithology-above fine sandstone,oil-bearing property-above oil spot,and physical property-Ф≥8.0%,K≥0.2×10^(-3)μm^(2),electrical property-Sw<58%,Rt≥38Ω·m,Δt≥220μs/m,based on which the log interpretation chart is established;The cumulative oil production and remaining technical recoverable geological reserves of small layers Chang613 and Chang622 are relatively high,and they are also the main target layers for the next secondary development.

关 键 词：裸眼井 油层识别 四性特征 二次解释 有效厚度下限 剩余油 

分 类 号：P61[天文地球—矿床学]