首页|Formation and Evolution Mechanism of High-quality Reservoirs in the Lacustrine Hyperpycnal System:The 2nd Member of the Lower Jurassic Sangonghe Formation,Qiudong Subsag,Turpan-Hami Basin,NW China

Formation and Evolution Mechanism of High-quality Reservoirs in the Lacustrine Hyperpycnal System:The 2nd Member of the Lower Jurassic Sangonghe Formation,Qiudong Subsag,Turpan-Hami Basin,NW China

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Formation and Evolution Mechanism of High-quality Reservoirs in the Lacustrine Hyperpycnal System:The 2nd Member of the Lower Jurassic Sangonghe Formation,Qiudong Subsag,Turpan-Hami Basin,NW China
Hyperpycnal deposits has gradually emerged as a current research hotspot,with a special focus on lacustrine hyperpycnal deposits.However,our understanding of the formation mechanism and distribution of high-quality reservoirs in hyperpycnal deposits remains insufficient.In this study,the formation mechanism and distribution of high-quality reservoirs in the second member of the Sangonghe Formation are studied through sedimentology,petrology,and geochemistry,and 10 types of lithofacies were identified in the depositional sequences of the hyperpycnal flow.These can be summarized as gravelly bed to suspended load lithofacies association(GBS),gravelly reverse to normal compound-graded(GNR),coarse-grained sandy suspended load(CSS),and fine-grained sandy suspended load(FSS)lithofacies associations.The hyperpycnal system can be divided into four individual units:restricted channel,unrestricted channel,lobe,and levee.The reservoir quality varies with lithofacies.Gravelly bed load lithofacies has coarse grain sizes,high content of rigid minerals,and soluble components,such as magmatic rock fragments.Therefore,the gravelly bed load lithofacies reservoir has developed dissolution pores and well-preserved pore throats.Its reservoir quality is good.GBS and GNR are the main lithofacies associations in the restricted channel,where type Ⅰ and type Ⅱ reservoirs developed.The unrestricted channel is dominated by the CSS lithofacies association,with type Ⅲ reservoirs developed.The lobe is dominated by the CSS and FSS lithofacies associations,with type Ⅲ and type Ⅳ reservoirs developed.High-quality reservoirs mainly develop in the restricted and unrestricted channels,whereas reservoirs in the lobe have poor quality.The levees are dominated by siltstone and gray mudstone and are generally nonreservoirs.

hyperpycnal flowlithofaciesreservoir qualityreservoir evolutiondepression lacustrine basin

LI Zhiyuan、HUANG Zhilong、WANG Junhui、WANG Boran、YAO Wenjiao、JIA Xueli、YANG Yizhuo、PAN Yongshuai、WU Yunfei

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State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum,Beijing 102249,China

College of Geosciences,China University of Petroleum,Beijing 102249,China

PetroChina Tuha Oilfield Company,Hami,Xinjiang 839009,China

hyperpycnal flow lithofacies reservoir quality reservoir evolution depression lacustrine basin

2024

地质学报(英文版)
中国地质学会

地质学报(英文版)

CSTPCD
影响因子:1.414
ISSN:1000-9515
年,卷(期):2024.98(6)