莺歌海盆地东方区黄流组大型强振幅体沉积内幕及其油气意义

doi:10.11743/ogg20180115

Abstract

Abstract: Based on substantial cores, drilling data, well logging, 2-D and 3-D seismic data, the geometry, facies associates, depositional phases, distribution and evolution of the large-scale high-amplitude seismic reflection package in the 1st member of the Huangliu Formation of Dongfang area were studied.In addition, characteristics of the favorable reservoirs was revealed and its significance in hydrocarbon exploration was discussed.Finally, the exploration strategy of Dongfang area was suggested.The results show that the large-scale high-amplitude reflection packages were gravity flow fan deposit.It consists of turbidite channel fill, overbank deposits and levee.Furthermore, it can be subdivided into three phases vertically.From the first phase to the third, the fan size increased gradually, while the fan migrated toward northwest step by step, with concurrent movement in the direction of southeast.Turbidite channel sand fill bodies are the most important reservoirs in Dongfang area proved by drilling, which were widely distributed and three-phases superimposed.The overpressure played an important role to improve reservoir properties in the 1st member of the Huangliu Formation in Dongfan area.There are mainly updip pinchout lithologic reservoirs in the flaps of diapiric domes, and lenticular sandstone lithologic reservoirs in western Dongfang area which is not associated with diapiric domes.Both of them are associated with the large-scale high-amplitude reflection and have very great exploration potential.

Key words: high-amplitude seismic reflection, sedimentary characteristics, lithologic reservoir, Yinggehai Basin, South China Sea

CLC Number:

TE122.2

Liao Jihua, Wu Keqiang, Guo Gang, Gan Huajun, Sun Ming, Cai Lulu, Zhu Shilei, Liu Ziyu. Characteristics of the large-scale high-amplitude reflections and its significance in hydrocarbon exploration in the Huangliu Formation of Dongfang area of the Yinggehai Basin, South China Sea[J]. Oil & Gas Geology, 2018, 39(1): 153-164.

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Characteristics of the large-scale high-amplitude reflections and its significance in hydrocarbon exploration in the Huangliu Formation of Dongfang area of the Yinggehai Basin, South China Sea

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