Reservoir characteristics and genesis of the Lower Ordovician Tongzi Formation in central Sichuan Basin, China

Although the Ordovician petroleum exploration in the Sichuan Basin has been developed slowly for a long time, deepening the research of reservoir characteristics and genesis is still a robust way to accelerate it. This paper characterizes the Ordovician reservoirs in the central part of Sichuan Basi...

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Main Authors: Li Zhou, Hao Tang, Yading Li, Ruiqing Tao, Wei Yan, Tao Ma, Shuang Pan, Yi Du, Zhenbo Tan, Xuefei Yang
Format: Article
Language:English
Published: Frontiers Media S.A. 2023-01-01
Series:Frontiers in Earth Science
Subjects:
Online Access:https://www.frontiersin.org/articles/10.3389/feart.2022.984491/full
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author Li Zhou
Hao Tang
Yading Li
Ruiqing Tao
Wei Yan
Tao Ma
Shuang Pan
Yi Du
Zhenbo Tan
Xuefei Yang
author_facet Li Zhou
Hao Tang
Yading Li
Ruiqing Tao
Wei Yan
Tao Ma
Shuang Pan
Yi Du
Zhenbo Tan
Xuefei Yang
author_sort Li Zhou
collection DOAJ
description Although the Ordovician petroleum exploration in the Sichuan Basin has been developed slowly for a long time, deepening the research of reservoir characteristics and genesis is still a robust way to accelerate it. This paper characterizes the Ordovician reservoirs in the central part of Sichuan Basin and analyzes their genesis based on cores, thin sections, well logs and drilling data. The results show the reservoirs concentrated in the Lower Ordovician Tongzi Formation, which consist mainly of sandy oolitic dolostones, bioclastic dolostones, fine crystalline dolostones, sandy dolomitized conglomerates, sandy dolostones and dolomite sandstone. The porosity types include interparticle pore, intraparticle pore, moldic pore, fracture and vug. Throats are mostly necked and flaky. The Tongzi Formation reservoirs mainly experienced three types of diageneses, including compaction, cementation and dissolution. The reservoir development was controlled by multiple factors of deposition, diagenesis and tectonics; the shoal facies is the basis, the penecontemporaneous dissolution and dolomitization are the main driving force, and the burial dissolution is the aid. The study can provide reference for deepening the Ordovician petroleum exploration and development in the Sichuan Basin.
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spelling doaj.art-f623ef8a65624b98b6808a76e3a8885e2023-01-11T04:26:50ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632023-01-011010.3389/feart.2022.984491984491Reservoir characteristics and genesis of the Lower Ordovician Tongzi Formation in central Sichuan Basin, ChinaLi Zhou0Hao Tang1Yading Li2Ruiqing Tao3Wei Yan4Tao Ma5Shuang Pan6Yi Du7Zhenbo Tan8Xuefei Yang9Division of Key Laboratory of Carbonate Reservoirs of CNPC, Southwest Petroleum University, Chengdu, ChinaDivision of Key Laboratory of Carbonate Reservoirs of CNPC, Southwest Petroleum University, Chengdu, ChinaSichuan Shale Gas Exploration and Development Co. LTD, Chengdu, ChinaThe 2nd Oil Production Plant, Northwest Oilfield Branch of Sinopec, Luntai, ChinaResearch Institute of Exploration and Development, PetroChina Southwest Oil and Gas Field Company, Chengdu, ChinaDivision of Key Laboratory of Carbonate Reservoirs of CNPC, Southwest Petroleum University, Chengdu, ChinaDivision of Key Laboratory of Carbonate Reservoirs of CNPC, Southwest Petroleum University, Chengdu, ChinaDivision of Key Laboratory of Carbonate Reservoirs of CNPC, Southwest Petroleum University, Chengdu, ChinaThe 3rd Oil Production Plant, PetroChina Qinghai Oil Field Company, Dunhuang, ChinaDivision of Key Laboratory of Carbonate Reservoirs of CNPC, Southwest Petroleum University, Chengdu, ChinaAlthough the Ordovician petroleum exploration in the Sichuan Basin has been developed slowly for a long time, deepening the research of reservoir characteristics and genesis is still a robust way to accelerate it. This paper characterizes the Ordovician reservoirs in the central part of Sichuan Basin and analyzes their genesis based on cores, thin sections, well logs and drilling data. The results show the reservoirs concentrated in the Lower Ordovician Tongzi Formation, which consist mainly of sandy oolitic dolostones, bioclastic dolostones, fine crystalline dolostones, sandy dolomitized conglomerates, sandy dolostones and dolomite sandstone. The porosity types include interparticle pore, intraparticle pore, moldic pore, fracture and vug. Throats are mostly necked and flaky. The Tongzi Formation reservoirs mainly experienced three types of diageneses, including compaction, cementation and dissolution. The reservoir development was controlled by multiple factors of deposition, diagenesis and tectonics; the shoal facies is the basis, the penecontemporaneous dissolution and dolomitization are the main driving force, and the burial dissolution is the aid. The study can provide reference for deepening the Ordovician petroleum exploration and development in the Sichuan Basin.https://www.frontiersin.org/articles/10.3389/feart.2022.984491/fullreservoir characteristicsdiagenesisOrdovicianSichuan Basinreservoir origin
spellingShingle Li Zhou
Hao Tang
Yading Li
Ruiqing Tao
Wei Yan
Tao Ma
Shuang Pan
Yi Du
Zhenbo Tan
Xuefei Yang
Reservoir characteristics and genesis of the Lower Ordovician Tongzi Formation in central Sichuan Basin, China
Frontiers in Earth Science
reservoir characteristics
diagenesis
Ordovician
Sichuan Basin
reservoir origin
title Reservoir characteristics and genesis of the Lower Ordovician Tongzi Formation in central Sichuan Basin, China
title_full Reservoir characteristics and genesis of the Lower Ordovician Tongzi Formation in central Sichuan Basin, China
title_fullStr Reservoir characteristics and genesis of the Lower Ordovician Tongzi Formation in central Sichuan Basin, China
title_full_unstemmed Reservoir characteristics and genesis of the Lower Ordovician Tongzi Formation in central Sichuan Basin, China
title_short Reservoir characteristics and genesis of the Lower Ordovician Tongzi Formation in central Sichuan Basin, China
title_sort reservoir characteristics and genesis of the lower ordovician tongzi formation in central sichuan basin china
topic reservoir characteristics
diagenesis
Ordovician
Sichuan Basin
reservoir origin
url https://www.frontiersin.org/articles/10.3389/feart.2022.984491/full
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