鄂尔多斯盆地东南部宜川—黄龙地区奥陶系风化壳储层发育特征  

Characteristics of Ordovician Weathering Crust Reservoir in Yichuan-Huanglong Area,Southeastern Ordos Basin

作　　者：田亚 杜治利 刘宝宪[2] 杜小弟 陈夷 Tian Ya;Du Zhili;Liu Baoxian;Du Xiaodi;Chen Yi(Oil&Gas Survey,China Geological Survey,Beijing 100029,China;Research Institute of Exploration and Development, Changqing Oilfield Company, PetroChina, Xi’an 710018,China)

机构地区：[1]中国地质调查局油气资源调查中心,北京100029 [2]中国石油长庆油田分公司勘探开发研究院,西安710018

出　　处：《吉林大学学报（地球科学版）》2017年第6期1620-1630,共11页Journal of Jilin University：Earth Science Edition

基　　金：国土资源部全国油气资源战略选区调查与评价项目(1211302108023)~~

摘　　要：综合利用地震、测井和岩心等资料,对鄂尔多斯盆地东南部宜川—黄龙地区奥陶系碳酸盐岩储层进行了分析,认为该区具岩溶储层标志特征。岩心分析测试表明:该区风化壳储层岩石类型为含膏白云岩及次生灰岩;储集空间为白云岩溶蚀孔洞、次生灰岩相对孤立溶孔和裂缝;储层整体较为致密,孔隙度为0.30%~11.54%,平均值为3.90%,渗透率为(0.002~15.450)×10^(-3)μm^2,平均值为0.710×10^(-3)μm^2。储层形成受顺层岩溶作用影响,综合古地貌、沉积相、裂缝等条件认为,宜川古潜台西侧区域为古地貌较高部位,顺层岩溶储层较为发育,是后期勘探开发的有利区。The authors found the indicative characteristics of paleokarst reservoir in YichuanHuanglong area in the southeastern Ordos basin,after a comprehensive analysis combining with seismic,well logging,and core data.The core data demonstrate that the reservoir rocks are mainly gypsumbearing dolomite and secondary limestone;the reservoir spaces are vugs in dolomite,relatively isolate caves,and fractures;the reservoirs are tight,the porosity varies from0.30%to11.54%,with an average of3.90%,and the permeability varies from0.002×10-3μm2to15.450×10-3μm2,with an average of0.710×10-3μm2.Reservoir quality is affected by bedded karstification.The comprehensive analysis was further conducted based on paleogeomorphology,depositional facies,and fractures.The results suggest that the western area of the Ordovician platform in Yichuan is a favorable target for exploration and development due to its high position in the paleo structure and bedded karstification in the reservoir.

关 键 词：鄂尔多斯盆地 奥陶系 马家沟组 顺层岩溶储层 

分 类 号：P618.13[天文地球—矿床学]