摘要
杭锦旗地区独贵加汗区带是鄂尔多斯盆地北部天然气勘探开发的重要对象,区带内下石盒子组砂岩储层非均质性强,含气饱和度差异大,前人对致密储层发育特征及其孔隙演化历史研究不够系统和深入。基于钻井岩心、岩石薄片及相关测试等资料,在统计、对比分析独贵加汗区带下石盒子组砂岩储层岩石学与物性特征的基础上,通过成岩作用分析,厘定控制储层孔隙发育的主要因素,进而重建主要储层段的孔隙演化历史。研究表明,杭锦旗地区独贵加汗区带下石盒子组砂岩多属超低渗透储层,局部存在裂缝发育的高渗透率段;压实作用和胶结作用对研究区储层孔隙演化起破坏性作用,减孔率分别为84.8%和7.1%,而溶蚀作用为建设性成岩作用,增孔率9.5%;盒一段储层现今孔隙度基本继承了早白垩世末期的特征,孔隙演化历经早成岩阶段A期压实与胶结作用快速减孔,B期持续压实减孔,中成岩A期溶蚀增孔作用与压实-胶结减孔作用并存及B期变化微弱等过程。
The Duguijiahan zone in Hangjinqi area is an important target for natural gas exploration and development in the northern Ordos Basin.The Upper Paleozoic sandstone reservoirs in the zone have strong heterogeneity and large differences in gas saturation.This has great influence on the development characteristics and development of tight reservoirs.The study of pore evolution history is not systematic and thorough.Based on drilling cores,rock thin slices and related testing data,on the basis of statistical and comparative analysis of the petrological and physical characteristics of Upper Paleozoic sandstone reservoirs in Duguijiahan area,through the analysis of diagenesis,the main factors that control the development of reservoir pores are determined factors to reconstruct the pore evolution history of the main reservoir section.Studies have shown that the Upper Paleozoic sandstones in Duguijiahan area are mostly ultra-low permeability reservoirs,with high permeability sections with developed fractures locally;compaction and cementation are destructive to the evolution of the reservoir pores in the study area.The porosity reduction rate is 84.8%and 7.1%,respectively,and the dissolution is a constructive diagenesis,and the porosity increase rate is 9.5%;the present porosity of the He 1st member reservoir basically inherits the characteristics of the end of the Early Cretaceous,and the pore evolution has gone through early diagenesis.In stage A,compaction and cementation are rapidly reduced,and in stage B,continuous compaction is reduced.In the middle diagenesis,the dissolution and pore-enhancing effects of phase A coexist with compaction and cementation and the process of weak change in phase B.
作者
李智
叶加仁
曹强
余汉文
张威
Li Zhi;Ye Jiaren;Cao Qiang;Yu Hanwen;Zhang Wei(Key Kaboratory of Tectonics and Petroleum Resources of Ministry of Education,China University of Geosciences(Wuhan),Wuhan 430074;Exploration&Production Research Institute of North China Company,SINOPEC,Zhengzhou 450006,China)
出处
《地质科技通报》
CAS
CSCD
北大核心
2021年第4期49-60,共12页
Bulletin of Geological Science and Technology
基金
国家科技重大专项(2016ZX05024-002-003)。
作者简介
李智(1998—),男,现正攻读矿产普查与勘探专业硕士学位,主要从事油气成藏评价的研究工作。E-mail:zli@cug.edu.cn;通信作者:叶加仁(1966—),男,教授,博士生导师,主要从事油气成藏动力学及资源评价等方面的教学与研究工作。E-mail:jrye@cug.edu.cn。
