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鄂尔多斯盆地奥陶系岩溶储层控制因素分析
引用本文:李振宏,王欣,杨遂正,郑聪斌.鄂尔多斯盆地奥陶系岩溶储层控制因素分析[J].现代地质,2006,20(2):299-306.
作者姓名:李振宏  王欣  杨遂正  郑聪斌
作者单位:长庆油田公司,勘探开发研究院,陕西,西安,710021
摘    要:鄂尔多斯盆地奥陶系岩溶储层演化经历了多期次的叠加。根据古岩溶的演化期次,分别编制了奥陶系地层厚度图、前石炭纪岩溶古地貌图及奥陶系顶面构造图。结合岩溶发育机理,系统分析了各个阶段岩溶储层发育的控制因素,进而综合预测了岩溶储层发育的有利区带,为奥陶系的油气勘探指出了有利方向。同沉积期,鄂尔多斯盆地存在伊盟古隆起、中央古隆起和韩城古隆起,这3个隆起带共同控制着岩溶储层的发育,隆起的鞍部、斜坡带以及坳陷中的微隆起带是岩溶储层发育的有利地区;裸露风化壳期,古岩溶地貌和古沟槽的展布是岩溶储层发育的主控因素,古岩溶坡地为岩溶作用的进一步发生创造了条件;埋藏期,奥陶系顶面起伏形态始终处于中部高、东西低,中部隆起与东部坳陷之间存在一陡坡带,中部隆起带为压释水运聚的有利方向,而陡坡带为压释水的强烈转换区,这一特征决定了岩溶储层的最终分布。因而,同沉积期隆起斜坡带、裸露风化壳期岩溶坡地以及埋藏期陡坡带的叠加位置将是岩溶储层发育的有利区域。

关 键 词:鄂尔多斯盆地  古地貌  同沉积期  裸露风化壳期  埋藏期  岩溶储层
文章编号:1000-8527(2006)02-0299-08
收稿时间:09 6 2005 12:00AM
修稿时间:02 19 2006 12:00AM

Analysis of Control Factors of Ordovician Karst Reservoir in Ordos Basin
LI Zhen-hong,WANG Xin,YANG Sui-zheng,ZHENG Cong-bin.Analysis of Control Factors of Ordovician Karst Reservoir in Ordos Basin[J].Geoscience——Journal of Graduate School,China University of Geosciences,2006,20(2):299-306.
Authors:LI Zhen-hong  WANG Xin  YANG Sui-zheng  ZHENG Cong-bin
Abstract:Ordovician karst reservoirs of Ordos Basin experienced several superpositions.According to evolutionary periods of paleokarst,three maps are drawn: Ordovician stratum thickness map,Pre-carboniferous karst landform and Ordovician top structure maps of Ordos Basin.Combined with karst development mechanism,the control factors of karst reservoir formation of each period are systematically analyzed,and then the favorable belts of karst reservoirs are comprehensively forecasted,so an advantageous direction of oil and gas exploration of Ordovician is obtained.In syndeposit peroid,there exited three old uplifts in Ordos Basin which controlled the karst reservoir development: Yimeng uplift,Central uplift and Hancheng uplift.The saddle and slope of the uplifts and micro-uplift of the depression are favorable areas of karst reservoir.In naked weathering period,paleokarst landform and paleo-groove distribution were the main control factors of karst reservoir development.Paleokarst sloping field was more favorable for karst evolution.In burial period,the middle part of the Ordovician top surface was high in the west and low in the east.There was a steep slope between the east uplift and the central depression.Water of compaction migrated and concentrated towards the central uplift and the steep slope was an intensive transition region.This character defined the final distribution of karst reservoirs.As a result,the superimposed position of the uplift slope in syndeposit period,the karst sloping field in naked residue period and the steep slope in burial period should be the favorable areas of karst reservoir development.
Keywords:Ordos Basin  ancient landform  syndeposit period  naked weathering period  burial period  karst reservoir
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