珠江口盆地陆丰凹陷南部文昌组储层发育特征及其控制因素

doi:10.11743/ogg20170615

Abstract

Abstract: The Wenchang Formation in the Lufeng Sag,Pearl River Mouth Basin,is sedimentary fill deposited in the rifting stage.High quality reservoir was developed in the 5^th Member of Wenchang Formation which was deposited during the early stage of rifting.To uncover the genetic mechanisms of high quality reservoir,various data including seismic,drilling,core,thin section,scanning electron microscope (SEM) images and mercury experiments were integrated to analyze the sedimentary facies,reservoir characteristics and diagenesis of the 5^th Member of Wenchang Formation in the LF-A Sub-sag,Southern Lufeng Sag.The research results indicate that the 5^th Member of Wenchang Formation is dominated by deposits of braid river delta front subfacies.Lithic quartz sandstones and feldspathic quartz sandstone are the dominatant rock types.The remnant primary intergranular pores are the main reservoir spaces.The 5^th Member of Wenchang Formation is characterized by low porosity,low-medium permeability,and low-medium displacement pressure.High quality reservoirs mainly present in thick channel sandstones with low lithic content and high maturity,reflecting the control of high energy environment on reservoir formation.The cementation and compaction processes in the early stages of diagenesis decreased porosity,while the dissolution process in the late stages of diagenesis enhanced reservoir property.Structural uplifting process in the early stages prohibited strong compaction by the overburden,making it possible for the preservation of large amount of primary pores,thus was the crucial factor for the formation of high quality reservoirs.

Key words: braid river delta, high quality reservoir, Wenchang high quality reservoir, Formation, Lufeng Sag, Pearl River Mouth Basin

CLC Number:

TE122.1

Wang Xudong, Zhang Xiangtao, He Min, Zhang Sufang, YuYixin, Wuchen Bingjie. Characteristics and controlling factors of reservoir development in the Wenchang Formation,Southern Lufeng Sag,Pearl River Mouth Basin[J]. Oil & Gas Geology, 2017, 38(6): 1147-1155.

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Characteristics and controlling factors of reservoir development in the Wenchang Formation,Southern Lufeng Sag,Pearl River Mouth Basin

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