doi:10.16186/j.cnki.1673-9787.2020.3.6

Received:2019/07/22

Revised:2019/09/26

Published:2020/05/15

Diagenetic facies and controlling factors of the sandstones from Shan 2₃ gas layers in the Suide-Wubu area， eastern Ordos basin

YAO Jingli1, LI Mi2,3, WANG Huaichang1, GUO Yinghai2,3, HOU Yundong1, BAI Wanbei2

1.Research Institute of Petroleum Exploration and Development， Changqing Oilfield Company， PetroChina ， Xi’an  710021 ， Shaanxi， China;2.Key Laboratory of CBM Resource and Reservoir-Generating Process，Xuzhou  221008 ， Jiangsu， China;3.School ofResources and Earth Science， China University of Mining & Technology， Xuzhou  221116 ， Jiangsu， China;4.School of Resources and Environment， Henan Polytechnic University， Jiaozuo  454000 ， Henan， China

Abstract:The study of diagenetic facies can provide reference for the search of effective reservoir. Based on the systematic observation and identification of 493 thin sections of sandstone samples from the 2₃ gas reservoir of Shanxi Formation in Suide-Wubao area， eastern Ordos basin， the main diagenesis types and characteristics of the sandstone reservoir were studied. According to the micro development characteristics of main diagenesis and reservoir physical properties， the diagenetic facies division scheme was established， and the characteristics， distribution rules and control factors of various diagenetic facies were studied. The sandstone reservoir of Shan 2₃ gas reservoir in the study area was in the middle diagenetic stage B ， which had undergone the transformation of compaction， cementation and dissolution. The diagenetic facies could be divided into three major categories and seven sub-categories. Among them， the porphyry tight assemblage pore facies was mainly distributed in quartz sandstone， which was located in the sand body in the center of river channel with large thickness. In addition， the residual intergranular pores and secondary dissolved pores were well observed in these sandstones， with high face porosities and good reservoir porosity and permeability conditions， which were favorable facies belts for effective reservoir distribution.

Key words:diagenesis;diagenetic facies;Shanxi formation;Ordos basin;Shan 2₃ gas layer sandstone

鄂尔多斯盆地东部绥德_吴堡地区山2_3气层砂岩成岩相类型与控因_姚泾利.pdf