LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (5): 128-134.doi: 10.3969/j.issn.1673-8926.2015.05.021

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Hydrocarbon accumulation characteristics and main controlling factors in eastern Baiyun Sag, Pearl River Mouth Basin

Xu Hui，Zhang Zhongtao，Li Ruibiao，Liu Baojun，Yan Hui,Yuan Cai   

  1.  Research Institute of Shenzhen Branch of CNOOC Ltd. ， Guangzhou 510240 ， China
  • Online:2015-09-26 Published:2015-09-26

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Abstract:

The hydrocarbon distribution in eastern Baiyun Sag is complex and variable. The hydrocarbon reservoirs in eastern Baiyun Sag own the characteristics of both generation of oil and gas, lower part generating and upper part accumulating; hydrocarbon accumulating in later stage, oil generating in early stage and gas generating in later stage, differential accumulation, as well as oil in the inner and gas in the outer. The main controlling factors for hydrocarbon accumulation are as follows: （1） hydrocarbon-generation depressions are the material basis for the formation of large oil and gas fields, and the activity of detachment faults with low angles in the early stage（rifted period） controls the basin development and the source rock scale; （2） effective traps and favorable migration pathways are two essential conditions for hydrocarbon accumulation, combined together, the inherited fractures and tectonic ridges in the later stage can control the traps and the hydrocarbon migration, and the favorable convergent nose-shaped tectonic ridges are excellent areas for oil and gas migration and accumulation; （3） the development degree of high-quality reservoirs is a critical factor influencing the hydrocarbon accumulation in Lower Zhujiang Formation, and controlled by the migration of short-term cycles of shelf slope break and sedimentary microreliefs, the high-quality sand bodies in multi-period shelf margin delta-deep water fan system with well developed sedimentation are important reservoirs and carrier beds. There are good oil and gas accumulation conditions in eastern Baiyun Sag, so to clarify hydrocarbon accumulation characteristics and main controlling factors is of certain guiding significance for hydrocarbon exploration in this area and adjacent areas.

Key words:  strike-slip faults , depositional system , hydrocarbon accumulation characteristics , Shaleitian uplift

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