基于岩性相-流动单元的低孔低渗储层产能精细预测——以东海陆架盆地西湖凹陷N构造为例  

Fine productivity prediction of reservoir with low-porosity and low-permeability based on lithofacies unit and flow units:an example from N structure,Xihu Sag,East China Sea Shelf Basin

作　　者：崔维平[1] 杨玉卿[1] 刘建新 刘志杰 CUI Weiping;YANG Yuqing;LIU Jianxin;LIU Zhijie

机构地区：[1]中海油田服务股份有限公司 [2]中海石油(中国)有限公司上海分公司

出　　处：《海相油气地质》2021年第4期299-306,共8页Marine Origin Petroleum Geology

基　　金：中海油重大专项子课题“中深层储层测井新技术资料处理与解释”(编号:CCL2017SHPSOO6EXP)资助。

摘　　要：针对海域中深层低孔低渗储层纵向非均质性强、孔隙结构较差、孔渗关系复杂、常规孔渗模型计算的渗透率难以满足产能精细预测要求的难题,应用高分辨率电成像测井资料,在岩性和沉积层理构造识别的基础上,结合成岩作用,将储层划分为若干个微尺度的岩性相单元,有效刻画出储层纵向上的非均质性特征和岩性相单元内相对均一的良好孔渗关系。在岩性相单元框架约束下,利用储层品质因子和岩性相(相当于流动单元)指数将储层划分为6类流动单元。应用测井解释物性结果和岩心相渗分析资料,获取各类储层静态渗透率,精度提高了44%。在此基础上,建立静态渗透率和动态渗透率转换模型,将动态渗透率应用到渗流力学稳态流产能预测方法中。对东海陆架盆地西湖凹陷N构造古近系花港组储层进行产能精细预测,取得了良好的应用效果,与DST测试结果相比符合率达到85.9%以上。In view of the problems of strong longitudinal heterogeneity,poor pore structure,complex porosity permeability relationship,and that permeability calculated by conventional porosity-permeability can’t meet the requirements of fine productivity prediction for low-porosity and low-permeability reservoirs of medium-deep formation in the sea area,the reservoir are divided into several micro-scale lithofacies units based on the identification of lithology and sedimentary bedding structure by logging data of high-resolution electrical imaging combined with diagenesis,which effectively depict the characteristics of longitudinal heterogeneity and relatively uniform and good porosity-permieability relationship of the reservoir.Under the constraints of the lithofacies unit framework,the reservoirs are divided into 6 types of flow units with the reservoir quality factor and lithofacies(equivalent to flow unit)index.Using logging interpretational results of physical property and core permeability analysis data to obtain static permeability of various reservoirs,the accuracy has increased by 44%.On this basis,the conversion model of static permeability and dynamic permeability is established,and the dynamic permeability is applied to the method of the steady-state flow productivity prediction.The fine productivity prediction of Paleogene Huagang Formation reservoir of N structure in Xihu Sag,East China Sea Shelf Basin has achieved good application effect,and the coincidence rate is more than 85.9%compared with DST test results.

关 键 词：低孔低渗储层 岩性相 流动单元 静态渗透率 动态渗透率 产能精细预测 西湖凹陷 

分 类 号：TE122.2[石油与天然气工程—油气勘探]