地质科技通报2024，Vol.43Issue(2)：16-27,12.DOI:10.19509/j.cnki.dzkq.tb20220592
塔里木盆地天山南地区古隆起周缘致密砂岩储层特征及主控因素
Characteristics and main controlling factors of the tight sandstone reser-voirs around the paleo-uplift in the southern Tianshan area,Tarim Basin
摘要
Abstract
[Objective]The main controlling factors and densification genesis of sandstone reservoirs around the paleo-uplift in the southern Tianshan area of the Tarim Basin have always restricted the increase in reserves and production in this area.[Methods]By using thin section and cathode luminescence(CL)observations,physical property testing,mercury injection analysis,and other related methods,the characteristics of sandstone reservoirs in the Lower Cretaceous Baxigai and Shushanhe Formations were studied,and the main factors controlling the reser-voir properties were also summarized.[Results]The study draws the following conclusions:The porosity of the tar-get layer in the study area is mostly less than 10％,and the permeability is less than 1×10-3 μm2,which is a typi-cal tight sandstone reservoir.Among them,the braided river delta sandstones exhibit the best physical properties(φ=12.3％,k=60.4×10-3 μm2)and pore structure,followed by the fan delta sandstones(φ=6.9％,k=1.9× 10-3 μm2),while the lacustrine sand bar facies features the worst physical properties(φ=6.7％,k=0.34×10-3μm2).The evolution of paleo-uplift controlled the differences between sedimentary facies and diagenetic processes.The sedimentary environment of braided river deltas and fan deltas has strong hydrodynamic forces,coarser parti-cles,and weak cementation,so the porosity and permeability are high.In contrast,the lacustrine sand bar facies are far away from terrigenous input,the grains are fine,and the underwater paleo-uplift controlled the formation of carbonate cement with high contents in the diagenetic stage,which blocked the pore throat and reduced the physical properties of the sandstone reservoir.[Conclusion]These results provide a reference for petroleum exploration and development of the Lower Cretaceous successions in the southern Tianshan area.关键词
储层特征/主控因素/古隆起/下白垩统/塔北隆起/致密砂岩储层Key words
reservoir characteristics/main controlling factor/paleo-uplift/Lower Cretaceous/Tabei Uplift/tight sandstone reservoir分类
天文与地球科学引用本文复制引用
夏永涛,王任,杨红彩,石万忠,巴合提亚尔·艾尼瓦尔,覃硕,张晓,徐壮..塔里木盆地天山南地区古隆起周缘致密砂岩储层特征及主控因素[J].地质科技通报,2024,43(2):16-27,12.基金项目
中国石油化工股份有限公司科技部项目"塔里木盆地天然气成藏条件与目标评价"子课题"塔里木盆地陆相天然气富集规律及目标优选"项目(P20063-03) （P20063-03）
国家自然科学基金项目(42202121) （42202121）
