鄂尔多斯盆地胡154 区块长4+5 段孔隙结构定量表征及分类  

Quantitative Characterization and Classification of Pore Structures in Chang 4+5 Member in Block Hu⁃154,Ordos Basin

作　　者：丁强 成健 杨博 靳紫馨 刘菲 赵子文 于景维 DING Qiang;CHENG Jian;YANG Bo;JIN Zixin;LIU Fei;ZHAO Ziwen;YU Jingwei(PetroChina Changqing Oilfield Company,The Sixth Oil Production Plant,Xi’an,Shaanxi 710016,China;PetroChina Changqing Oilfield Company,The First Gas Recovery Plant,Xi’an,Shaanxi 710016,China;Chongqing Gas Field,Southwest Oil and Gas Field Company,PetroChina,Chongqing 400700,China;Karamay Campus,China University of Petroleum(Beijing),Karamay,Xinjiang 834000,China)

机构地区：[1]中国石油长庆油田分公司第六采油厂,陕西西安710016 [2]中国石油长庆油田分公司第一采气厂,陕西西安710016 [3]中国石油西南油气田分公司重庆气矿,重庆400700 [4]中国石油大学(北京)克拉玛依校区,新疆克拉玛依834000

出　　处：《新疆石油地质》2021年第4期410-417,共8页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2011ZX05001-005-01);新疆自治区自然科学基金面上项目(2021D01A201);中国石油大学(北京)克拉玛依校区人才引进项目(RCYJ2016B-01-010);克拉玛依市科技局项目(2019RC001A)。

摘　　要：鄂尔多斯盆地胡尖山油田胡154区块三叠系延长组长4+5段属于低孔低渗储集层,孔隙结构相关研究较少,缺乏详细定量化分析,导致胡154区块产量下降较快,水驱控制程度不高。为定量表征研究区目的层孔隙结构,利用岩心、薄片、铸体薄片、扫描电镜、高压压汞及相渗实验资料,对孔隙结构进行定量表征及分类,结合测井曲线,对不同类型孔隙结构储集层在平面上的分布进行研究。结果表明,研究区长4+5段孔隙类型以剩余粒间孔为主,喉道类型主要为片状和弯片状。孔隙结构划分为3类:Ⅰ类孔隙结构分形维数分布于2.57~2.61,排驱压力平均为1.62 MPa,日产油量2 t以上;Ⅱ类孔隙结构分形维数分布于2.61~2.66,排驱压力平均为2.61 MPa,日产油量1~2 t;Ⅲ类孔隙结构分形维数分布于2.66~2.71,排驱压力平均为3.52 MPa,日产油量小于1 t。具有Ⅱ类孔隙结构和Ⅲ类孔隙结构的储集层在平面上分布较广,长(4+5)2孔隙结构相对好于长(4+5)1。In Block Hu154 of Hujianshan oilfield in the Ordos basin,the reservoirs of Chang 4+5 member in the Triassic Yanchang formation are of low porosity and low permeability,and there are few researches on the pore structures of the reservoirs and detailed quantitative analysis,which may be the cause for the rapid production decline and less waterflooding control in this block.Based on the data of cores,slices,cast thin sections,SEM,highpressure mercury intrusion and phase permeability experiments,quantitative characterization and classification of the pore structures have been carried out,and the plane distribution of the pore structures has been studied by combining with well logging curves in the study area.The results show that residual intergranular pores and flakelike and curved flakelike throats are dominant in the Chang 4+5 member in the study area.According to the structure,the pores can be divided into three types:(1)Type Ⅰ pores:the fractal dimension is 2.57~2.61,the average displacement pressure is 1.62 MPa and the oil production rate is over 2 t/d;(2)Type Ⅱ pores:the fractal dimension is 2.61~2.66,the average displacement pressure is 2.61 MPa and the oil production rate is higher than 1~2 t/d;(3)Type Ⅲ pores:the fractal dimension is 2.66~2.71,the average displacement pressure is 3.52 MPa and the oil production rate is lower than 1 t/d.Reservoirs with Type Ⅱ and Ⅲ pores are distributed on a large scale,and the pore structure in the Chang(4+5)2 is better than that in the Chang(4+5)1 in the study area.

关 键 词：鄂尔多斯盆地 胡尖山油田 胡154区块 延长组 储集层 长4+5段 孔隙结构 定量表征 

分 类 号：TE122.23[石油与天然气工程—油气勘探]