摘要
昆北油田切12区位于柴达木盆地西南缘昆北断阶带,夹持于昆前断裂和昆北断裂,紧邻切克里克生油凹陷,是重要的油气资源勘探区域。本文以区内下干柴沟组下段储层钻井取芯、测录井资料为基础,结合储层物性特征研究、压汞法毛细管压力测试、覆压下孔渗变化关系及岩石铸体薄片、电子扫描显微镜镜下观察等手段,明确了下干柴沟组下段储层条件较好,稳定发育辫状三角洲平原亚相的分流河道微相;孔隙类型以原生粒间孔为主,次生溶孔、构造微裂缝发育加剧了储层物性的非均质性,且实质性的提高了储层的渗透性;成岩作用总体控制储层的孔隙演化,溶蚀作用为建设性成岩作用,压实作用为储层物性的主控因素。结论对下一步精细勘探和开发提供了依据。
Qie 12 block in the Qunbei oilfield, an important hydrocarbon exploration area, is located at the Kunbei step-fault zone in the south of Qaidam Basin, which is sandwiched between Kunqian fault and Kunbei fault and closed to Qiekelike source sag. The sandstone in the Lower Ganchaigou Formation in the Qie 12 block is high-quality reservoir deposited in the distributary channel of braided delta plain subfacies, which was confirmed with several experiments, including rock property measurement, mercury injection experiment, variation of porosity and permeability under pressure, casting and conventional thin section observation, and Scanning Electron Microscope with cores and log data. Pore system is dominated by primary intergranular pores, while secondary dissolving pores and fractures intense the heterogeneity, but enhancing reservoir permeability.Diagenesis determines the pore evolution, specifically, dissolution is the main constructive diagenesis process,while compaction is the main control factor. The result can provide significant insight into the hydrocarbon exploration and development in the studying area.
作者
王海琦
祁文彬
WANG Hai-qi;QI Wen-bin(Gansu Provincial Bureau of Geology and Mineral Exploration and Development,Lanzhou 730000,China;Gausu Management Center of Geological Exploration Fund,Lanzhou 730000,China)
出处
《甘肃地质》
2018年第2期70-77,共8页
Gansu Geology
基金
国家油气专项"前陆盆地油气成藏规律
关键技术及目标评价"项目(2011ZX05003)资助
关键词
昆北断阶带
下干柴沟组
沉积特征
微观孔隙结构
控制因素
Kunbei step-fauh zone
Lower Ganchaigou Formation
depositional characteristics
micro-porestructure
control factors
