The hydrocarbon accumulation timing of T3x4 natural gas reservoir in the central Western Sichuan Depression

Wang Ping, Pan Wen-Lei, Chen Ying-Bing, Wu Xiao-Qi, Wang Bao-Hua

doi:10.11764/j.issn.1672-1926.2016.08.1419

Natural Gas Geoscience >

2016 , Vol. 27 >Issue 8: 1419 - 1426

DOI: https://doi.org/10.11764/j.issn.1672-1926.2016.08.1419

The hydrocarbon accumulation timing of T₃x₄natural gas reservoir in the central Western Sichuan Depression

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Wuxi Research Institute of Petroleum Geology,Sinopec,Wuxi 214151,China

Received date: 2016-01-05

Revised date: 2016-04-15

Online published: 2019-09-11

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Abstract

The middle part of Western Sichuan Depression has undergone complex diagenesis and strong tectonic evolution,which controlled the complex progress of gas filling and occurrence.So the T₃x₄ hydrocarbon accumulation timing is an important exploration consideration and a difficult task.Sandstone samples were collected from key wells of five different tectonic units: Chengdu Sag,Xinchang,Zhongjiang-Huilong,Longmenshanqian and Zhixinchang tectonic zone.On the basis of the fluid inclusion analysis,we completed a systemic study of the hydrocarbon accumulation period of two sub-sections of T₃x₄,the upper and lower T₃x₄.The timing is constrained by the fluid inclusion types and the setting points of homogenization temperatures on a burial and thermal history diagram.This study shows that the lower T₃x₄ has experienced only one period of hydrocarbon accumulation,which mainly happened in the early-middle Yanshanian.That natural gas charge has a good preservation through later geological time.For the upper T₃x₄,there are two different periods of hydrocarbon accumulation: the earlier one is early-middle Yanshanian,but in the later period,much of the reservoir has been modified,and then refilled in the early Xishanian.The study about the paleotectonics evolution of the Late Jurassic and Early Cretaceous rocks,further explains the constraint of the geological movement during the Yanshanian and Xishanian upon the T₃x₄ gas accumulation and distribution.

Key words： T₃x₄; Fluid inclusions; Hydrocarbon accumulation; Paleo-tectonics

Cite this article

Wang Ping, Pan Wen-Lei, Chen Ying-Bing, Wu Xiao-Qi, Wang Bao-Hua . The hydrocarbon accumulation timing of T₃x₄natural gas reservoir in the central Western Sichuan Depression[J]. Natural Gas Geoscience, 2016 , 27(8) : 1419 -1426 . DOI: 10.11764/j.issn.1672-1926.2016.08.1419

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