Pore Structure Characterization of Clay Minerals in the Lower Karamay Formation Conglomerate Reservoir in the Junggar Basin and its Impact on Hydrocarbon Storage and Seepage  

作　　者：Taskyn ABITKAZY DU Shuheng XU Feng SHI Yongmin 

机构地区：[1]School of Earth and Space Sciences,Peking University,Beijing 100871,China [2]Research Institute of Petroleum Exploration and Development Co.,Ltd.,CNPC,Beijing 100083,China [3]State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Acta Geologica Sinica(English Edition)》2021年第2期558-569,共12页地质学报（英文版）

基　　金：granted by Petro China Innovation Foundation(Grant No.2019D-5007-0214);the National Mega Project of Oil and Gas(Grant No.2017ZX05013005-009)。

摘　　要：The micro-nano pore structure of conglomerate in the Lower Karamay Formation of the Xinjiang Oilfield,Junggar Basin,northern China is characterized to predict its impact on fluid reserves and seepage.Authigenic clay minerals are mainly kaolinite(67%),followed by an illite/smectite mixed layer(18%),illite(10%),and chlorite(5%).For kaolinite,pore throats between 0–200 nm are dominant,accounting for 90%of the total pore throats.For illite/smectite mixed layer,pore throats also between 0–200 nm account for nearly 80%,while pore throats between 200-500 nm only account for 15%.For illite,pore throats below 100 nm account for about 80%,while pore throats in the range of 100–500 nm only account for 20%.For chlorite,most throats are below 200 nm.The pore roundness of illite is the highest,while the pore roundness of chlorite is relatively lower.The lower limits of the dynamic and static pore throat radii are 42.128 nm and 72.42 nm,respectively.The theoretical contribution rates of the illite/smectite mixed layer,kaolinite,illite and chlorite to storage/seepage are 60%/45.86%,52.72%/38.18%,37.07%/28.78%and 32.97%/26.3%,respectively.Therefore,the contribution rates of clay minerals in the study area are as follows:illite/smectite mixed layer,kaolinite,illite and chlorite.

关 键 词：oil CONGLOMERATE clay minerals micro-nano pore reservoir characterization TRIASSIC XINJIANG 

分 类 号：P618.13[天文地球—矿床学]