--> Squence Stratigraphic Architecture and Favorable Reservoir Sandbodies of the Hanjiang Formation on the Northern Slope of the Baiyun Sag, Pearl River Mouth Basin
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AAPG ACE 2018

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Squence Stratigraphic Architecture and Favorable Reservoir Sandbodies of the Hanjiang Formation on the Northern Slope of the Baiyun Sag, Pearl River Mouth Basin

Jiawei Zhou1, Yingmin Wang1, Min He2, WeiTao Chen2


1Zhejiang University, Zhoushan, China.
2Shenzhen Branch of CNOOC Ltd., Shenzhen, China.


July 23 - 25, 2018 – AAPG ACE 2018,

Posted: July 23-25, 2018

Abstract

Baiyun Sag is the key area of oil and gas exploration in the Pearl River Mouth Basin, South China Sea. Based on the drilling, logging and 3D seismic data, under the guidance of sequence stratigraphy, seismic sedimentology and seismic geomorphology, the succession of middle Hanjiang Formation on the northern slope of Baiyun Sag can be divided into two third-order sequences. Each third-order sequence can be subdivided into low standard Previous HitsystemsNext Hit Previous HittractNext Hit (LST), transgression Previous HitsystemsNext Hit Previous HittractNext Hit (TST), high standard Previous HitsystemsNext Hit Previous HittractNext Hit (HST) and forced regressive Previous HitsystemsNext Hit Previous HittractNext Hit (FSST). The two Previous HitdepositionalNext Hit Previous HitsystemsNext Hit of shelf–edge delta and abyssal fan are recognized within the middle of Hanjiang Formation, and the planar distribution and morphology of sedimentary facies in each Previous HitdepositionalNext Hit system are analyzed within the high-accuracy sequence stratigraphic framework. The shelf-edge delta Previous HitdepositionalNext Hit system develops in the forced regressive Previous HitsystemsNext Hit Previous HittractNext Hit, corresponding to the period of relative sea-level falling, while the abyssal fan Previous HitdepositionalNext Hit system belongs to the low standard Previous HitsystemsNext Hit Previous HittractNext Hit, corresponding to the period of relative sea-level rising. In seismic attributes maps and slices, typical sedimentary architectures in the two Previous HitdepositionalNext Hit Previous HitsystemsTop are recognized and depicted, including distributary channels, longshore sandbar, sheet sand, deepwater channels and lobes. On this basis, we predict the distribution of the favorable reservoir facies belts and the types of traps, which have a great prospect for oil and gas exploration. Besides we observe that the migratory direction of the depocenter of shelf-edge delta has changed from east to west at the 13.8Ma, which probably is influenced by enhanced ocean current caused by the climate change and the tectonic uplifting of Dongsha area.

AAPG Datapages/Search and Discovery Article #90323 ©2018 AAPG Annual Convention and Exhibition, Salt Lake City, Utah, May 20-23, 2018