鄂尔多斯盆地延长组长73亚段泥页岩层系岩石类型特征及勘探意义
刘显阳,李士祥,郭芪恒,周新平,刘江艳

Characteristics of rock types and exploration significance of the shale strata in the Chang 73 sub-member of Yanchang Formation, Ordos Basin
Xianyang LIU,Shixiang LI,Qiheng GUO,Xinping ZHOU,Jiangyan LIU
表1 鄂尔多斯盆地长73亚段5类岩石测井响应特征
Table 1 Logging response characteristics of five type rocks in the Chang 73 sub-member of Ordos Basin
岩石类型砂质岩类泥页岩类凝灰岩类
岩性细砂岩粉砂岩黑色页岩暗色泥岩凝灰岩
厚度/m0.3~20.1~15~405~400.5~3
自然伽马/API<12080~300>180120~300>150
U/API<33~8>8<5
TH/10-6较高
密度/(g/cm3>2.42.3~2.5<2.32.3~2.42.3~2.5
声波/(μs/m)<250250~275>275200~250>250
电阻/(Ω·m)>50>50>8040~100<20
TOC/%<42~6>62~6<2
岩心特征

城页1井,2 030.66 m

城页1井,2 054.23 m

庄153井,1 657.35 m

城页1井,2 057.59 m

里231井,1 657.35 m