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

doi:10.13278/j.cnki.jjuese.201706102

摘要/Abstract

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^-3μm²，平均值为0.710×10^-3μm²。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。

关键词: 鄂尔多斯盆地, 奥陶系, 马家沟组, 顺层岩溶储层

Abstract: 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 from 0.30% to 11.54%,with an average of 3.90%, and the permeability varies from 0.002×10^-3 μm² to 15.450×10^-3 μm²,with an average of 0.710×10^-3 μm². 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.

Key words: Ordos basin, Ordovician, Majiagou Formation, bedded karstification reservoir

中图分类号:

P618.13

田亚, 杜治利, 刘宝宪, 杜小弟, 陈夷. 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[J]. 吉林大学学报(地球科学版), 2017, 47(6): 1620-1630.

Tian Ya, Du Zhili, Liu Baoxian, Du Xiaodi, Chen Yi. Characteristics of Ordovician Weathering Crust Reservoir in Yichuan-Huanglong Area, Southeastern Ordos Basin[J]. Journal of Jilin University(Earth Science Edition), 2017, 47(6): 1620-1630.

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