自生粘土矿物对文昌A凹陷深部储层的制约

袁晓蔷; 姚光庆; 杨香华; 尤丽; 陆江

doi:10.3799/dqkx.2018.368

Volume 44 Issue 3

Mar. 2019

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Article Navigation > Earth Science > 2019 > 44(3): 909-918

Yuan Xiaoqiang, Yao Guangqing, Yang Xianghua, You Li, Lu Jiang, 2019. Constraints of Authigenic Clay Minerals on Deep Reservoirs in Wenchang A Sag. Earth Science, 44(3): 909-918. doi: 10.3799/dqkx.2018.368

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Yuan Xiaoqiang, Yao Guangqing, Yang Xianghua, You Li, Lu Jiang, 2019. Constraints of Authigenic Clay Minerals on Deep Reservoirs in Wenchang A Sag. Earth Science, 44(3): 909-918. doi: 10.3799/dqkx.2018.368

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Constraints of Authigenic Clay Minerals on Deep Reservoirs in Wenchang A Sag

doi: 10.3799/dqkx.2018.368

1.
School of Earth Resources, China University of Geosciences, Wuhan 430074, China
2.
Zhanjiang Branch of China National Offshore Oil Corporation Ltd., Zhanjiang 524034, China

Received Date: 2018-11-07
Publish Date: 2019-03-15

Abstract

Abstract

The research on the impacts of authigenic clay minerals on pore throat structure and hydrocarbon migration and accumulation is very weak.In this study, impacts of authigenic clay on pore connectivity, pore-throat size and its distribution were investigated for the resulting impacts on hydrocarbon accumulation and percolation in order to find out the genetic mechanism of tight sandstones in Oligocene Zhuhai Formation of Wenchang A Sag, Pearl River Mouth Basin.Thin slice identification, whole rock X-ray diffraction analysis, scanning electron microscopy and rate-controlled mercury injection were employed to characterize authigenic clay and its physical property.Source-reservoir assemblages were studied based on burial history and hydrocarbon-generating history of underlying source rocks.Two types were distinguished as "pore combined with throat" and "fine diameter throat-controlling".The former contains more interparticle pores and thick throat, while the latter contains mainly narrow throat.Mechanical compaction led to primary porosity lost and authigenic clay-related pores gradually played a significant role in controlling pore structure of tight sandstone reservoirs.There is very little difference in porosity and wide distribution in permeability between the two pore structure types.The unconformity contact between reservoirs and source rocks forms a favorable source-storage combination for lateral continuous distribution, and the source rocks have been generating hydrocarbon constantly.Mechanical compaction and authigenic clay are considered to be control factors affecting reservoir property and hydrocarbon enrichment for the following reasons:the pore structure and permeability are chiefly controlled by fine diameter of pore and throat as well as complex relation between pore and throat, the underlying source rocks have been providing constant driving force and hydrocarbon supply.Zhuhai Formation serves a representative example for deep buried tight sandstone reservoir.
- Wenchang A Sag,
- Zhuhai Formation,
- low permeability reservoir,
- genetic mechanism,
- hydrocarbon accumulation,
- petroleum geology

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References(35)

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