Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (4): 67-77，94.doi: 10.3969/j.issn.1673-8926.2016.04.009

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Sequence stratigraphy and depositional systems of Wenchang Formation in the southern Lufeng area, Pearl River Mouth Basin

Chen Feng 1，2，Zhu Xiaomin 1，2，Ge Jiawang 1，2，Li Ming 3，Wu Chenbingjie 1，2   

  1. 1. State Key Laboratory of Petroleum Resource and Prospecting，China University of Petroleum，Beijing 102249，China；2. College of Geosciences，China University of Petroleum，Beijing 102249，China；3. Research Institute of Shenzhen Branch，CNOOC，Shenzhen，510240，Guangdong，China
  • Online:2016-07-20 Published:2016-07-20

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Abstract:

Lufeng Depression is a proven rich?hydrocarbon accumulation area in the Pearl River Mouth Basin. The drilling of oil and gas mainly focused on the Wenchang Formation in the southern Lufeng depression in the past years.Because of multiple tectonic movements and limited amounts of drilling wells, the evolution of depositional systems and favorable reservoirs distribution are unclear, which restricts further hydrocarbon exploration in Lufeng Depression. Under the guidance of sedimentology and sequence stratigraphy, the sequence stratigraphy framework and depositional systems were discussed based on the comprehensive analyses of core, logging and new acquired 3D seismic data.According to the characteristics of seismic reflection and wireline logging changes, the Wenchang Formation is a second?order sequence, and it can be subdivided into six third-order sequences, which represent a complete sedimentary filling process of the lacustrine basin including initial rifting, intensive rifting, weak rifting and thermal depression from bottom to top. According to seismic reflection characteristics, several types of seismic facies were recognized including subparallel-hummoky seismic facies, parallel-subparallel sheet-shaped seismic facies, wedge-chaotic infilling seismic facies, fastigiate or wedge progradational seismic facies, progradational seismic facies（oblique or sigmodial)and moundy seismic facies. The distribution of these seismic facies of Wenchang Formation is related in the vertical profile.Depositional systems composed of braided river delta, nearshore subaqueous fan, fan delta, lacustrine and turbidity fan are developed during the Wenchang depositional stage. Controlled by rifting stages, the depositional systems display obvious cycling characteristics vertically. This study points out that the braided river delta front sandstone in SQ2 would be the favorable exploration targets. The nearshore subaqueous fan, fan delta and turbidity fan in SQ3 and SQ4 are the potential exploration targets.

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