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《鄂爾多斯盆地姬塬地區(qū)長(zhǎng)8致密儲(chǔ)層溶蝕作用模擬及其影響因素》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在工程資料-天天文庫(kù)。
1、鄂爾多斯盆地姬塬地區(qū)長(zhǎng)8致密儲(chǔ)層溶蝕作用模擬及其影響因素摘要:在明確鄂爾多斯盆地姬塬地區(qū)西部長(zhǎng)8致密儲(chǔ)層基本特點(diǎn)的基礎(chǔ)上,利用高溫高壓儲(chǔ)層流體巖石相互作用模擬儀,模擬了長(zhǎng)8儲(chǔ)層巖石與有機(jī)酸溶蝕反應(yīng)的過(guò)程。依據(jù)地質(zhì)條件,采用015mol?L-1乙酸溶液(pH=2.65)作?櫸從θ芤海?模擬溫度選溶蝕窗口對(duì)應(yīng)深度的實(shí)際古地溫(87℃~103℃),模擬壓力范圍為24.70~30.18MPa。通過(guò)反應(yīng)前后樣品儲(chǔ)層特征的變化及溶蝕率對(duì)比,分析了長(zhǎng)8致密儲(chǔ)層的溶蝕特征及影響因素,探討了其溶蝕過(guò)程及溶蝕增孔過(guò)程。結(jié)果表明:在乙酸的作用下,致密儲(chǔ)層長(zhǎng)石(鈉長(zhǎng)石、鉀
2、長(zhǎng)石)和方解石礦物發(fā)生明顯的溶蝕反應(yīng),并產(chǎn)生沉淀物;根據(jù)礦物相對(duì)溶蝕率發(fā)現(xiàn),碳酸鹽礦物的溶解速率整體上大于長(zhǎng)石礦物,其中方解石大于白云石,斜長(zhǎng)石大于鉀長(zhǎng)石;隨著溫度和壓力的增加,方解石溶蝕率先增加后不變,而長(zhǎng)石溶蝕率基本呈線性增加,但是方解石剛開始溶蝕率高于長(zhǎng)石;致密儲(chǔ)層溶蝕過(guò)程主要分為3個(gè)階段,分別為方解石膠結(jié)物溶蝕過(guò)程、長(zhǎng)石溶蝕過(guò)程和溶蝕后沉淀物充填過(guò)程。溶蝕作用使得致密儲(chǔ)層的孔隙明顯增加,是致密儲(chǔ)層增孔的主要成巖作用類型,也是尋找致密儲(chǔ)層中“甜點(diǎn)”的關(guān)鍵因素之一。中國(guó)8/vie 關(guān)鍵詞:致密儲(chǔ)層;溶蝕礦物;模擬試驗(yàn);流體巖石相互作用;X射線
3、衍射;溶蝕率;延長(zhǎng)組;鄂爾多斯盆地 中圖分類號(hào):P618.130.2文獻(xiàn)標(biāo)志碼:A DissolutionSimulationofChang8TightReservoirinJiyuanAreaofOrdosBasin,ChinaandItsInfluencingFactors OUResourcesofGansuProvince/KeyLaboratory ofPetroleumResourcesResearchofChineseAcademyofSciences,Lanzhou730000,Gansu,China; 3.Univers
4、ityofChineseAcademyofSciences,Beijing100049,China;4.StateKeyLaboratoryof PetroleumResourcesandProspecting,ChinaUniversityofPetroleum,Beijing102249,China) Abstract:BasedonthestudyofthebasicfeaturesofChang8tightreservoirinulatedbythefluidrockinteractionsimulatorofhightemperatu
5、reandpressurereservoir.Accordingtothegeologicalconditions,015mol?L-1aceticacidsolutionulatedtemperatureperature(87℃103℃)correspondingulatedpressureplesbeforeandafterthereactionentineralsoccursobviously,andproducessediments;accordingtotherelativedissolutionrateofminerals,thedis
6、solutionvelocityofmineralislargerthanthatoffeldsparinite,andthatofplagioclaseislargerthanpotassiumfeldspar;peratureandpressure,thedissolutionratesofcalcitesremainunchangedafterthefirstincrease,andthedissolutionratesoffeldsparincreaselinearly,butthedissolutionratesofcalciteareh
7、igherthanthatoffeldsparsatthebeginning;thedissolutionprocessoftightreservoirisdividedintothreestages,includingcalcitecementdissolutionprocess,feldspardissolutionprocessandsedimentfillingprocessafterdissolution.Dissolutionmakestheporesoftightreservoirsincreasingsignificantly,an
8、disamaindiageictypeoftightreservoirporosityenhancement,andisa