鄂尔多斯盆地西缘向斜区羊虎沟组超低渗储层成因机理分析

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中图分类号：P618.13；TE121 文献标识码：A 文章编号：2097-5465（2025）06-0035-11

Abstract：InviewoftheporphysicalpropertiesofthesandstonereservoirsoftheYanghugouFormationinthesyclineareaofthe middlesectionofthewesternmarginoftheOrdosBasinandthelowexplorationdegree，thecharacteristicsofthesandstone reservoirsoftheYanghugouFormationwerecharacterizedandtheformationmechanismoftheultra-lowpermeabilitysandstone reservoirs wasexplored throughmethodssuchasthinsections，scanning electronmicroscopy，seismicand imaginglogging， combined withthepreviousresearchresultsonsedimentationandtectonics.Theresultsshow that：1）TheYanghugouFormationof theCarboniferous periodwasdepositedinalowenergyandstabletidalflat-lagoonsedimentarysystem，anddevelopedcoal-bearing stratawithfinegrainsizeandlowsand-to-shaleratio.Thesandstonehasthecharacteristicsofsmallsingle-layerthickness，fine grainsize，poorphysicalpropertiesandlowporosity；2）ThesedimentarythicknessoftheYanghugouFormationislarge，andthe contentofcementishigh，whichhasasignificantimpactontheformationoftightsandstonereservoirs；3）TheYanghugou Formationhasexplorationpotentialforcoal-bearinggasandtightsandstonegas.ThethickmudstonesectionoftheupperYanghugou 1memberisdistributedcontinuously，withclaysheet-ikefracturesandorganicmatterporesanddisslutionporesdeveloped inside，andmicro-poresandmicro-fracturesdevelopedformingself-generatedandself-storedcoal-bearinggasrservois；thetight sandstoneswetspots withgoodphysical propertiesinterbedded inthecoal-bearingstrataandthesourcerockswithinthesource forma good source-reservoir configuration，which canbe used as the key exploration target for the next step.

Keywords：tightsandstone；Yanghugou Formation；westernmargin；OrdosBasin

0 引言

随着鄂尔多斯盆地东部古生界多个整装气田的发现，以及南部上古生界天然气勘探的规模展开，鄂尔多斯盆地本部已经具有较高的天然气勘探程度。（剩余11966字）