沉积学报2025，Vol.43Issue(3)：1116-1129,14.DOI:10.14027/j.issn.1000-0550.2023.097
深层致密砂砾岩储层特征及控制因素
Characteristics and Controlling Factors of Deep Buried Tight Conglomerate:A case study from the Permian Upper Urho Formation of Fukang Sag,Junggar Basin
摘要
Abstract
[Objective]The Permian Upper Urho Formation along the eastern slope area of Fukang Sag is an impor-tant oil and gas exploration formation in the Junggar Basin.However,the deep conglomerate reservoir is tight,and the unclear reservoir characteristics and controlling factors restrict further oil and gas exploration and development.[Methods]Through core observations,casting thin sections,physical properties,scanning electron microscopy,high-pressure mercury injection curves,and other data,the petrological characteristics,physical properties,pore characteristics,and controlling factors of the tight conglomerate reservoir of the Upper Urho Formation in the slope ar-ea of Fukang Sag were studied.[Results](1)the reservoir is composed of lithic sandstone with ultra-low porosity and permeability;(2)the pore types consist of micropores and fractures,and the pore structure is characterized by small pores and micro throats,with poor connectivity;and(3)sedimentary microfacies are the basis for strong reservoir heterogeneity.Conglomerates deposited in clastic flow channels and fine sandstones deposited in far sandbars have high matrix content and poor physical properties,whereas conglomeratic sandstones deposited in underwater distribu-tary channels have relatively good physical properties.The high illite matrix,diagenetic compaction,and cementa-tion are the main factors causing reservoir tightness.Late stage overpressure origin by pressure conduction cannot pre-serve primary pores.Fractures improve reservoir permeability leading to high oil and gas production.[Conclusions]The conglomeratic sandstone in the underwater distributary channel at the top of P3w1 and bottom of P3w2 has a relatively low matrix content,developed matrix pores,and good reservoir properties.The Fubei area,far from the influence of provenance of the Xiquan uplift,is a favorable area for further oil and gas exploration.关键词
致密砂砾岩/深层储层/成岩作用/控制因素/阜康凹陷/上乌尔禾组/准噶尔盆地Key words
tight conglomerate/deep buried reservoir/diagenesis/controlling factors/Fukang Sag/Upper Urho Formation/Junggar Basin分类
天文与地球科学引用本文复制引用
单祥,窦洋,刘超威,潘进,郭华军,彭博,李克..深层致密砂砾岩储层特征及控制因素[J].沉积学报,2025,43(3):1116-1129,14.基金项目
中国石油天然气股份有限公司"十四五"基础性前瞻性重大科技项目(2021DJ0202,2021DJ0108) （2021DJ0202,2021DJ0108）
中国石油天然气股份有限公司科技专项(2023ZZ24-01)[China National Petroleum Corporation's"Fourteenth Five Year Plan"Basic Prospective Major Scientific and Technological Project,No.2021DJ0202,2021DJ0108 （2023ZZ24-01）
China National Petroleum Corporation's Important Science and Technology Project,No.2023ZZ24-01] （）
