【摘要】：通過孔滲測定、電鏡掃描、鑄體薄片、陰極發(fā)光、高壓與恒速壓汞等測試手段,對鄂爾多斯盆地SMG探區(qū)長8段致密儲層的孔滲關(guān)系、巖石學特征、孔喉結(jié)構(gòu)及尺寸分布進行全面系統(tǒng)地剖析,結(jié)果表明:該區(qū)長8儲層平均孔隙度為6.52%,平均滲透0.113×10-3μm~2,孔滲關(guān)系復(fù)雜,井間非均質(zhì)性較強;儲層碎屑組分以長石為主,屬長石砂巖;發(fā)育粒間孔和長石等溶孔,綠泥石與泥質(zhì)填隙物含量較高,使得孔滲條件進一步變差,屬微孔-微喉型結(jié)構(gòu);依據(jù)壓汞參數(shù)及毛管力曲線特征將長8儲層分為3類:Ⅰ類為低門檻壓力-高進汞飽和度型,Ⅱ類為低門檻壓力-低進汞飽和度型,Ⅲ類為高門檻壓力-低進汞飽和度型,Ⅰ類儲層最好,屬于"優(yōu)質(zhì)"儲層,Ⅱ類次之,Ⅲ類最差。
[Abstract]:By means of measurement of porosity and permeability, scanning electron microscope, casting sheet, cathodoluminescence, high pressure and constant velocity mercury pressure, the relationship between porosity and permeability and petrological characteristics of the tight reservoirs of the Chang 8 member in the SMG area of Ordos Basin are studied. The results show that the average porosity of Chang 8 reservoir is 6.52, the average permeability is 0.113 脳 10 ~ (-3) 渭 m ~ (-2), the relationship between pore and permeability is complex, and the cross-well heterogeneity is strong. The clastic composition of the reservoir is mainly feldspar, which belongs to feldspar sandstone, and develops intergranular pore and feldspar dissolution pore, and the content of chlorite and muddy interstitial material is higher, which makes the pore and permeability condition worse, and belongs to micropore microlarynx structure. According to the characteristics of mercury injection parameters and capillary force curves, Chang 8 reservoirs are divided into three types: type I, low threshold pressure-high mercury saturation, type 鈪，

本文編號：2374573