琼海凸起新近系低幅-低阻油藏形成条件及成藏模式

doi:10.11743/ogg20140303

Abstract

Abstract:

Using geochemical,sedimentary and hydrocarbon accumulation analysis methods,this paper studied the characteristics of source rocks,hydrocarbon migration and accumulation of the low resistivity reservoirs of the 1^st Member of Zhujiang Formation(Zhu1)in the low-amplitude structure of Qionghai salient in Wenchang-13 block,Qionghai salient.The following results were obtained.The oil of the Zhu1 low resistivity reservoir in Wenchang 13-X is mainly sourced from the shallow lacustrine mudstone of Enping Formation in Wenchang sag,which is another high quality source rock in addition to the Wenchang Formation mudstone of mid-deep lacustrine faciesin.The low resistivity reservoirs of Zhu1 in Wenchang13 block are of structural-lithologic composite type developed in the low amplitude drape anticlines.The main reservoir consists of offshore fine muddy siltstone with fine grain and high mud content,which are the main causes of the low resistivity.The low resistivity reservoirs area characterized by low amplitude structure and low permeability.The low resistivity reservoirs are secondary accumulation with hydrocarbons sourced from the underlying high resistivity reservoir.The low resistivity and high resistivity reservoirs superimpose vertically to form a hydrocarbon enrichment zone.The low resistivity reservoirs in low amplitude structure are important targets for potential-tapping in mature area.

Key words: low amplitude structure, low-resistivity oil layer, Enping Formation, Qionghai salient

CLC Number:

TE122.3

Gan Jun, Zhang Yingzhao, Deng Guangjun, Lu Jiang, Zheng Rongfen. Forming conditions and hydrocarbon accumulation patterns of the Neogene low resistivity reservoirs in low-amplitude structure of Qionghai Salient[J]. Oil & Gas Geology, 2014, 35(3): 311-316,349.

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Forming conditions and hydrocarbon accumulation patterns of the Neogene low resistivity reservoirs in low-amplitude structure of Qionghai Salient

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