海相油气地质2025，Vol.30Issue(5)：500-514,15.DOI:10.3969/j.issn.1672-9854.2025.05.010
鄂尔多斯盆地海相碳酸盐岩规模优质储层分布与勘探方向
Distribution of large-scale high-quality carbonate reservoirs and exploration directions in the Ordos Basin
摘要
Abstract
The Lower Paleozoic marine carbonate rocks in the Ordos Basin represent a critical natural gas exploration target in China.However,problems such as strong reservoir heterogeneity and complex hydrocarbon accumulation controlling factors have severely restricted large-scale and efficient exploration and development.This study integrates the latest exploration results with regional seismic profiles,focusing on key scientific issues such as lithofacies paleogeographic evolution,genetic types and controlling factors of reservoirs,and source-reservoir configurations,to systematically investigate the distribution patterns of high-quality carbonate reservoirs and evaluate their exploration potential.The main findings are as follows:(1)The Early Paleozoic sedimentary environment underwent a complete evolutionary sequence from mixed sedimentary shelf(Mantou to Xuzhuang Formation)to carbonate ramps(Zhangxia to Majiagou Formation)and finally to rimmed platforms(Upper Majiagou Formation).Among these,the inner ramp grain shoal facies belts around paleo-uplifts and marine basins exhibit the most favorable reservoir properties.(2)Reservoir development is jointly controlled by depositional microfacies,penecontemporaneous dissolution,supergene karstification,and dolomitization.Five types of reservoirs are identified in the Cambrian-Ordovician succession:grain shoal,algal mound,bioturbated,moldic pore,and dissolution vug types.These reservoirs are predominantly distributed along paleo-uplifts,basin margins and slope breaks.(3)Based on comprehensive analysis of tectonic-sedimentary framework,source-reservoir relationships,and sealing conditions,three highly prospective exploration zones are delineated:the eastern Wuyin marine basin,both flanks of the Yitong marine basin,and the western Shenmu-Mizhi platform depression,with a total area of 10.5×104 km2.This study provides critical theoretical support and practical guidance for gas exploration in marine carbonate rocks of the Ordos Basin.关键词
海相碳酸盐岩/储层分布/天然气成藏/勘探方向/寒武系/奥陶系/鄂尔多斯盆地Key words
marine carbonate rock/reservoir distribution/natural gas accumulation/exploration direction/Cambrian/Or-dovician/Ordos Basin分类
石油、天然气工程引用本文复制引用
范立勇,吴东旭,任军峰,王永骁,魏柳斌,张豪,李维岭,鲁慧丽,朱文博..鄂尔多斯盆地海相碳酸盐岩规模优质储层分布与勘探方向[J].海相油气地质,2025,30(5):500-514,15.基金项目
本文受中国石油天然气集团有限公司科技项目"海相碳酸盐岩油气规模增储上产与勘探开发技术研究"(编号:2023ZZ16YJ01)、中国石油长庆油田公司项目"鄂尔多斯盆地中新元古界—古生界重点风险领域储层特征及分布规律研究"(编号:2023YQX10105-3)和"中国石油重点地区风险勘探目标研究"(编号:2023YQX10101)联合资助 （编号:2023ZZ16YJ01）
