Sedimentary microfacies and microrelief of organic-rich shale in deep-water shelf and their control on reservoirs:a case study of shale from Wufeng-Longmaxi formations in southern Sichuan Basin

被引：0

作者：

Guo W. ^{[1
,3
]}

Li X. ^{[1
,3
]}

Zhang X. ^{[1
,3
]}

Lan C. ^{[1
,2
,3
]}

Liang P. ^{[1
,3
]}

Shen W. ^{[3
,4
]}

Zheng M. ^{[3
,5
]}

机构：

[1] PetroChina Research Institute of Petroleum Exploration and Development, Beijing

[2] State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing

[3] College of Petroleum Engineering, China University of Petroleum, Beijing

[4] Institute of Mechanics, Chinese Academy of Sciences, Beijing

[5] Sichuan Changning Natural Gas Development Company Ltd., Sichuan, Chengdu

来源：

Shiyou Xuebao/Acta Petrolei Sinica | 2022年 / 43卷 / 08期

关键词：

deep-water shelf; Longmaxi Formation; organic-rich shale; sedimentary microfacies; sedimentary microrelief; Wufeng Formation;

D O I：

10.7623/syxb202208005

中图分类号：

学科分类号：

摘要：

Based on the data of drilling,logging,core description,thin section identification and core experimental analysis,as well as the sedimentary characteristics of modern oceans,the paper investigates the mineral content distribution,lithofacies characteristics and sedimentary types of organic-rich shale in the Ordovician Wufeng Formation and Silurian Longmaxi Formation in Luzhou area,southern Sichuan Basin,divides the types of the sedimentary microfacies and microrelief of deep-water shelf,and then analyzes the influences of the both on reservoirs.The results are as follows.(1) The terrigenous clasts of organic-rich shale in Wufeng Formation and Longmaxi Formation in the study area are originated from the submerged highland in the north of the central Sichuan Basin,and their lithofacies are mainly shown as siliceous shale,clay-bearing siliceous shale and mixed shale.(2) The sedimentary types of target strata are dominated by hemipelagic sediment and turbidity sediment.(3) The sedimentary microfacies in deep-water shelf can be subdivided into 6 types,i.e.,calcareous shelf,calcareous-siliceous shelf,calcareous-siliceous-argillaceous mixed shelf,siliceous-argillaceous shelf,siliceous shelf and argillaceous-rich fan.Among them,siliceous shelf,siliceous-argillaceous shelf and calcareous-siliceous-argillaceous mixed shelf are mainly developed in the study area.Sedimentary microrelief can be subdivided into five types,i.e.,shelf highland,shelf slope,shelf gully,shelf mound and shelf plain.Among them,shelf plain and shelf slope are mainly developed in the study area.(4) Sedimentary microfacies in deep-water shelf control the reservoir quality of organic-rich shale by controlling the reservoir capacity.Calcareous-siliceous-argillaceous mixed shelf and siliceous shelf have the best reservoir quality.Sedimentary microrelief exerts influence on the quality of shale reservoir by controlling the thickness of organic-rich shale,and the reservoir in shelf plain is the thickest.(5) In the deep-water shelf environment,with the increase of sedimentary water depth,the sedimentary microrelief is evolved from shelf highland to shelf plain (or shelf mound) through shelf slope (or shelf gully or shelf mound),and the sedimentary microfacies are evolved from calcareous-siliceous shelf to silicon-argillaceous shelf (or argillaceous-rich fan) through calcareous-siliceous-argillaceous mixed shelf,and finally evolve into siliceous shelf.The sedimentary microfacies model of deep-water shelf can provide scientific support for reservoir evaluation and prediction of deep organic-rich shale.(6) The organic-rich shale in deep-water shelf is deposited at the edge of the shelf,and its sedimentary depth can exceed 200 m. © 2022 Science Press. All rights reserved.

引用

页码：1089 / 1106

页数：17

共 63 条

[1]

ZOU Caineng, PAN Songqi, JING Zhenhua, Et al., Shale oil and gas revolution and its impact[J], Acta Petrolei Sinica, 41, 1, pp. 1-12, (2020)

[2]

ABOUELRESH M O, SLATT R M., Lithofacies and sequence stratigraphy of the Barnett shale in east-central Fort Worth Basin, Texas, AAPG Bulletin, 96, 1, pp. 1-22, (2012)

[3]

HAMMES U, FREBOURG G., Haynesville and Bossier mudrocks:a facies and sequence stratigraphic investigation, East Texas and Louisiana, USA[J], Marine and Petroleum Geology, 31, 1, pp. 8-26, (2012)

[4]

SLATT R M, RODRIGUEZ N D., Comparative sequence stratigraphy and organic geochemistry of gas shales:commonality or coincidence?[J], Journal of Natural Gas Science and Engineering, 8, pp. 68-84, (2012)

[5]

HEMMESCH N T, HARRIS N B, MNICH C A, Et al., A sequence-stratigraphic framework for the Upper Devonian Woodford shale, Permian Basin, West Texas, AAPG Bulletin, 98, 1, pp. 23-47, (2014)

[6]

SLATT R M., Sequence stratigraphy of unconventional resource shales, Fundamentals of gas shale reservoirs, pp. 71-88, (2015)

[7]

WANG Tong, YANG Keming, XIONG Liang, Et al., Shale sequence stratigraphy of Wufeng-Longmaxi Formation in southern Sichuan and their control on reservoirs[J], Acta Petrolei Sinica, 36, 8, pp. 915-925, (2015)

[8]

GUO Xusheng, Sequence stratigraphy and evolution model of the Wufeng-Longmaxi shale in the Upper Yangtze area[J], Earth Science, 42, 7, pp. 1069-1082, (2017)

[9]

ZHANG Jingyu, LU Yongchao, FU Xiaoyue, Et al., Sequence stratigraphic framework and sedimentary evolution of the Wufeng Formation-the 1st member of Longmaxi Formation in Fuling area, Sichuan Basin[J], Geological Science and Technology Information, 36, 4, pp. 65-72, (2017)

[10]

LOUCKS R G, RUPPEL S C., Mississippian Barnett Shale:lithofacies and depositional setting of a deep-water shale-gas succession in the Fort Worth Basin, Texas[J], AAPG Bulletin, 91, 4, pp. 579-601, (2007)

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