鄂尔多斯盆地东缘储层主控因素分析——以石盒子组储层为例  

Analysis of reservoir main controlling factors in the eastern margin of Ordos Basin:Taking Shihezi Formation reservoir as an example

作　　者：侯杰 田浩年 孙俊义 张颂颂 朱波宁 Hou Jie;Tian Haonian;Sun Junyi;Zhang Songsong;Zhu Boning(Linfen Branch,PetroChina Coalbed Methane Co.,Ltd.,Linfen 041000,China)

机构地区：[1]中石油煤层气有限责任公司临汾分公司,山西临汾041000

出　　处：《能源与环保》2024年第11期88-95,102,共9页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

摘　　要：为明确鄂尔多斯盆地东缘大宁—吉县地区山西组—下石盒子组储层沉积相特征和优质储层的主控因素,依据测录井资料,测井相结合地震相明确了研究区为三角洲前缘沉积相类型,细分了水下分流河道、河口坝、水下分流河道间3种沉积微相。在明确储层沉积相特征的基础上,对岩石类型进行分析。通过全岩衍射数据发现,自生黏土矿物或者杂基的胶结作用对孔隙有充填作用,是影响研究区孔隙减少的主要原因,填隙物含量少,对应储层渗透性好;岩石粒度受区域沉积演化控制作用明显,同时矿物成分石英含量与储层物性的好坏成正比,也是储层的主控因素之一。对岩心、镜下薄片观察发现,孔隙类型中粒间—粒内溶孔对应成熟度高的优质储层;利用最大似然法预测微裂缝平面发育区,与地质甜点区具有一致性,揭示了微裂缝发育是地质甜点形成和储量富集的主控因素之一。To clarify the sedimentary facies characteristics and main controlling factors of reservoirs in the Shanxi Formation and Lower Shihezi Formation reservoirs in the Daning and Jixian areas of the eastern margin of the Ordos Basin,the delta front sedimentary facies type in the study area was defined based on logging data and seismic facies,and three kinds of sedimentary microfacies were subdivided into underwater distributary channel,estuary bar and underwater distributary channel.On the basis of clarifying the sedimentary facies characteristics of reservoir,the rock types were analyzed.Through the whole-rock diffraction data,it was found that the cementation of authigenic clay minerals or complex bases has a filling effect on the pores,which is the main reason affecting the reduction of pores in the study area.When the content of interstitial material is small,the corresponding reservoir permeability is good.The grain size of rock is obviously controlled by regional sedimentary evolution,and the quartz content of mineral composition is proportional to the physical property of reservoir,which is also one of the main controlling factors of reservoir.Through the observation of the core and the microscopic slice,it was found that the intergranular and intragranular dissolved pores in the pore type correspond to high quality reservoirs with high maturity.The maximum likelihood method was used to predict the plane development area of microfractures,which was consistent with the geological sweet spot area,revealing that microfracture development is one of the main controlling factors for the formation of geological sweet spots and the accumulation of reserves.

关 键 词：鄂尔多斯盆地东缘 沉积相 岩石类型 孔隙类型 微裂缝 主控因素 

分 类 号：TE234.9[石油与天然气工程—油气井工程]