东海西湖凹陷A气田渐新统花港组三段厚层砂岩沉积环境

doi:10.11743/ogg20190607

Abstract

Abstract: The thick clastic reservoir in the 3rd member of the Huagang Formation is a major gas pay zone and high-qua-lity reservoir in A gas field in the Xihu Sag,East China Sea Basin,but there still exists great dispute over its sedimentary microfacies.We studied the facies markers,microfacies types,sedimentary setting,and facies distribution of the target interval through integration of core,logging,seismic and laboratory data.The results show that the study area mainly deve-lops the braided river delta-front subfacies,which mainly consists of underwater distributary channels and interdistributary microfacies without sediments and facies markers indicating marine facies and transgression.Vertically,multi-stage underwater distributary channel sand bodies superimpose,featuring large thickness and great horizontal extension.Laterally,the underwater distributary channels are characterized by tree-like bifurcation and continuous distribution from northeast to southwest,with its provenance in the northeast.It is believed that a lacustrine-delta sedimentary system of continental setting exists in the study area and is typical traction current deposits without any transgression sequence.The underwater distributary channels microfacies of high-energy traction currents is advantageous for the development of prolific gas reservoirs in the study area.

Key words: braided delta, sedimentary microfacies, Huagang Formation, central inverted structural belt, Xihu Sag

CLC Number:

TE121.3

Zhu Yixiu, Huang Daowu, Wang Huan, He Xianke, Shi Yuan, She Yaming. Sedimentary setting of thick sandstone in the 3rd member of the Oligocene Huagang Formation in A gas field in the Xihu Sag,East China Sea Basin[J]. Oil & Gas Geology, 2019, 40(6): 1226-1235.

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Sedimentary setting of thick sandstone in the 3rd member of the Oligocene Huagang Formation in A gas field in the Xihu Sag,East China Sea Basin

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