塔河油田碳酸盐岩缝洞型油藏单储系数概率分布模型  

A probability distribution model of reserves per unit volume of fracture-cavity reservoirs in Tahe Oilfield

作　　者：李斌[1,2] 吕海涛[1,3] 耿峰 虎北辰 郑见超 梁宇 LI Bin;LÜ Haitao;GENG Feng;HU Beichen;ZHENG Jianchao;LIANG Yu(School of Geoscience and Technology,Southwest Petroleum University,Chengdu City,Sichuan Province,610500,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploration,Southwest Petroleum University,Chengdu City,Sichuan Province,610500,China;Exploration and Development Research Institute,Northwest Oilfield Company,SINOPEC,Urumqi,Xinjiang,830011,China;School of Geoscience and Surveying Engineering,China University of Mining and Technology,Beijing City,100083,China)

机构地区：[1]西南石油大学地球科学与技术学院,四川成都610500 [2]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [3]中国石化西北油田分公司勘探开发研究院,新疆乌鲁木齐830011 [4]中国矿业大学地球科学与测绘工程学院,北京100083

出　　处：《油气地质与采收率》2021年第3期62-69,共8页Petroleum Geology and Recovery Efficiency

基　　金：四川省区域创新合作项目“复杂油藏高效开发相关技术研究及推广应用”(21QYCX0050)。

摘　　要：应用概率法进行油藏储量计算是行业发展的趋势。针对塔河油田奥陶系碳酸盐岩缝洞型油藏单储系数,采用概率法开展洞穴型、孔洞型和裂缝型油藏单储系数的拟合研究,建立概率分布模型。研究结果表明:塔河油田缝洞型油藏单储系数符合Beta分布模型,其中,洞穴型储层单储系数最高,概率法计算的Pmean值达10.7×10^(4) t(/km^(2)·m)。孔洞型油藏单储系数为0.61×10^(4)~2.2×10^(4) t(/km^(2)·m),裂缝型油藏单储系数为0.08×10^(4)~0.19×10^(4) t(/km^(2)·m)。明确缝洞型油藏单储系数地质分布规律,指出缝洞型储层发育规模及原油密度对单储系数影响较大,呈正相关,储层发育规模越大,原油密度越大,单储系数越高。在相同地质条件下,样本值法与概率法计算的单储系数较为接近,略呈正相关,随着勘探进展,应用概率法计算油藏储量准确性更高。The calculation of oil and gas reserves by the probability method represents the trend in the oil industry.To study the reserves per unit volume of Ordovician fracture-cavity carbonate oil reservoir in Tahe Oilfield,we fitted the re⁃serves per unit volume in cave,vuggy and fractured reservoirs with the probability method and established a probability dis⁃tribution model.The research demonstrates that the reserves per unit volume of fracture-cavity reservoirs in Tahe Oilfield conform to the Beta distribution model.To be specific,the reserves per unit volume in cave reservoirs are the highest,and the Pmean value calculated by the probability method reaches 10.7×10^(4) t(/km^(2)·m).The reserves per unit volume in vuggy reservoirs are 0.61×10^(4)-2.2×10^(4) t(/km^(2)·m),while those in fractured reservoirs are 0.08×10^(4)-0.19×10^(4) t(/km^(2)·m).The geological distribution of reserves per unit volume in fracture-cavity reservoirs is clarified.It is pointed out that the scale of fracture-cavity reservoirs and crude oil density greatly influence the reserves per unit volume,revealing a positive correla⁃tion.The larger reservoir scale and the higher crude oil density indicate the greater reserves per unit volume.Under the same geological conditions,the reserves per unit volume based on the sample values and the probability method are similar,showing a slight positive correlation. As the exploration progresses,the probability method is more accurate for calculatingthe reserves of oil reservoirs.

关 键 词：概率法 单储系数 缝洞型油藏 蒙特卡洛 塔河油田 

分 类 号：TE341[石油与天然气工程—油气田开发工程]