低渗透储层不同成岩相微观孔隙结构特征及其测井识别差异性分析:以姬塬油田王盘山长6_1储层为例  

Characteristics of Micro-pore Structure and Differential Analysis of Logging Identification for Different Diagenetic Facies in Low Permeability Reservoir:A Case Study on Chang 6_1 Reservoir in Wangpanshan Area of Jiyuan Oilfield

作　　者：韩进 孙卫[1] 杨波[3] 樊秀江 吴彦君[5] HAN Jin;SUN Wei;YANG Bo;FAN Xiujiang;WU Yanjun(State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xian,Shaanxi 710069’ China;Cofeye of Petroleum Enyineeriny and Environmental Engineering,Yan'an University,Yan,an,Shaanxi 716000,China;;Shaanxi Coalbed Methane Development Co.Ltd.,Xian,Shaanxi 710075,China;QilicunOil Proguctiog Plant of YancCann Oilfield, Yan'an,Shaanxi 716000,China;;Baota Oil Production Plant qf Yanhany Oilfield,Yan'an,Shaanxi 716000,China)

机构地区：[1]西北大学大陆动力学国家重点实验室/地质学系,陕西西安710069 [2]延安大学石油工程与环境工程学院,陕西延安716000 [3]陕西省煤层气开发利用有限公司,陕西西安710075 [4]延长油田股份有限公司七里村采油厂,陕西延安716000 [5]延长油田股份有限公司宝塔采油厂,陕西延安716000

出　　处：《现代地质》2018年第6期1182-1193,共12页Geoscience

基　　金：陕西省教育厅专项科研计划项目(15JK1812);延安大学自然科学专项基金项目(YDQ2013-23)

摘　　要：基于铸体薄片、扫描电镜、岩心照片、恒速压汞等资料,综合考虑物源、黏土矿物类型、孔隙类型、成岩作用等参数将王盘山长61储层划分成6种不同组合类型成岩相,其中优势储集成岩相为高岭石+绿泥石胶结-粒间孔相、高岭石胶结-溶孔+粒间孔相、绿泥石+高岭石胶结-溶孔相等。研究表明:不同类型成岩相的微观孔隙结构特征及测井响应特征不同,各成岩相微观孔喉差异明显,尤其体现在毛管压力曲线和喉道上,喉道半径与渗透率的相关性好于孔隙半径与孔隙度、渗透率的相关性,优势成岩相孔喉半径较均匀、连通性好、渗流能力较强,相同进汞压力条件下进汞饱和度高;利用自然伽马、声波时差、电阻率等测井曲线,归纳了不同成岩相的测井响应特征,建立了各成岩相测井响应识别模板,确定了不同成岩相的测井响应定量判别标准,最终实现储层纵向上成岩相的识别与划分,为低渗透砂岩储层甜点预测提供重要参考。Based on information from casting thin sections,scanning electron microscopy(SEM),core photos ad constant speed mercury pressure analysis,and with the consideration of the material source,clay mineral,pore type and diagenesis,the Chang 6t reservoir of Wangpanshan is divided into six different diagenetic facies.The dominant reservoir facies are kaolinite+chlorite cementation-intergranular pore,kaolinite cementation-dissolved pore+intergranular pore,and chlorite+kaolinite cementation-dissolution pore.This study shows that the microscopic pore structures and logging responses of the different diagenetic facies are various.The variation of micro-pore throat in each diagenetic phase is distinct,especially in the capillary pressure curve and throat.Correlation betw^een the throat radius and permeability is better than that betw^een the pore radius,porosity and permeability.Moreover,the pore throat radius of the dominating diagenetic facies is more uniform,with better connectivity and seepage ability,which keep high mercury saturation under the same pressure of the mercury intake.The logging response characteristics of the different diagenetic facies are summed up by using natural gamma ray,sonic time difference,resistivity and other logging curves.We then established the logging response identification template for each diagenetic facies,and determined the quantitative identification criteria for log ging response of the different diagenetic facies.With that,we identified and divided the vertical upper diagenetic facies of the single well,which provide an important reference for the prediction of sweet spot in low permea bility sandstone reservoirs.

关 键 词：长61储层 成岩相 恒速压汞 喉道 测井曲线 

分 类 号：TE122.2[石油与天然气工程—油气勘探]