鄂尔多斯盆地乔川一元城地区长8储层特征及主控因素

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中图分类号：P618.13 文献标志码：A 文章编号：1003-5168（2025）14-0107-06

DOI：10.19968/j.cnki.hnkj.1003-5168.2025.14.021

Reservoir Characteristics and Main Controlling Factors of Chang 8 in theQiaochuan-Yuancheng Area of the ErdosBasin

TIANTian1 WU Guorong1 LYUNana1 LIN Li¹ ZHAIWenbin2.3 （1.The Tenth Oil Production Plant of Changqing Oilfield Company， China National Petroleum Corporation， Qingcheng 7451Oo，China; 2.School of Earth Science and Engineering，Xi'an Shiyou University，Xi'an 710065， China; 3.Shaanxi Key Lab of Petroleum Accumulation Geology，Xi'an Shiyou University， Xi'an 710065， China）

Abstract： [Purposes]To clarify the basic characteristics and main controlling factors of the Chang 8 reservoir in the Qiaochuan-Yuancheng area of the Ordos Basin，and to provide a more accurate geological basis for oil and gas exploration and development in the region.[Methods]By using experimental methods such as rock cast thin sections，scanning electron microscopy，and high-pressure mercury injection， the characteristics of the reservoir were analyzed，clarifying the basic features and main controlling factors of the reservoir.[Findings] The results indicate that the Chang 8 reservoir mainly consists of lithic feldspar sandstone and feldspar lithic sandstone.It belongs to an ultra-low porosity and ultra-low permeability reservoir， with complex pore structures and relatively low pore content.The microstructure character-istics of mercury intrusion show that the pore structure isrelatively poor，dominated by fine throats.[Conclusions] Through analysis，it is concluded that sedimentation provides the the foundation forhigh-quality reservoir development， with such reservoirs primarily forming in underwater distributary channel microfacies of delta-front sedimentary subfacies.Compaction and cementation，as the primary destructive diagenetic processes，degrade reservoir properties.And dissolution，as the main constructive diagenesis，improves the physical properties of reservoirs by forming secondary pores ， which is the main factor in the formation of high-quality reservoirs.

Keywords： Ordos Basin; Chang 8 reservoir; sedimentation; diagenesis; structural function

0 引言

鄂尔多斯盆地延长组长8段是重要的油气储集层。（剩余5877字）