珠江口盆地中新统珠江组强制海退沉积层序与有利砂体分布<sup>*</sup>

doi:10.7605/gdlxb.2018.05.059

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Abstract

Insufficient understanding in the characteristics of sedimentary sequences of the falling stage system tracts and unreasonable sequence division have hampered the breakthrough of oil and gas exploration in the Zhujiang Formation of Pearl River Mouth Basin. In this study,characteristics of the sedimentary sequence,evolution model and favorable sand body distribution in the falling stage system tracts of the Zhujiang Formation were investigated regarding the formation mechanism of forced regression. Guided by the concepts and methods of sequence stratigraphy,seismic sedimentology,and petroleum geology,comprehensive analyses of the high-resolution 3D seismic,core and logging data were conducted. Based on obvious toplap(erosion)geometries against the upper boundary,the falling stage system tracts should be attributed to the last system tract of the SQ1 sequence. The evolution model of the sedimentary sequence of the falling stage system tracts has also been summarized. The characteristics of the falling stage system tracts in seismic reflection show high angle oblique progradation and offlapping stratal stacking patterns,typical of shelf-edge deltas. The drilling and logging data show many reverse cycles consisting of delta front mud,distal bar,mouth bar and underwater distributary channel in the falling stage systems tract. The bioturbation,muddy strip deformation,slide and slump features,typical of slope areas,are commonly present in the cores of the falling stage system tracts. The turbidite fan with strong amplitude reflection structure is developed in the downdip direction of the falling stage system tracts. The favorable reservoirs include sand bodies of the shelf-edge delta front located close to the upper boundary of the falling stage system tracts and the sand bodies of the turbidite fan located close to the basal surface of forced regression,which are important exploration breakthroughs of lithologic reservoirs.

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	Articles by authors
	Yu Ye
	Zhang Chang-Min
	Li Shao-Hua
	Du Jia-Yuan
	Huang Yan-Ran
	Wang Li

Key words： falling stage systems tract sedimentary sequence favorable sand-body distribution Zhujiang Formation Pearl River Mouth Basin

Received: 26 April 2018

ZTFLH:

P736.22

Fund:

National Science and Technology Major Project of China(No.2011ZX05023-002-007)

About author: Yu Ye,born in 1983,got his doctoral degree in 2014 from Yangtze University. Now,he is a lecturer and mainly engaged in reservoir sedimentology and sequence stratigraphy. E-mail: yuye1983@163.com.

Cite this article:

Yu Ye,Zhang Chang-Min,Li Shao-Hua et al. Sedimentary sequence and favorable sand-body distribution in falling stage system tracts of the Miocene Zhujiang Formation in Pearl River Mouth Basin[J]. JOPC, 2018, 20(5): 841-854.

URL:

http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2018.05.059 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2018/V20/I5/841

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