Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (2): 46-54.doi: 10.3969/j.issn.1673-8926.2015.02.008

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Characteristics and main controlling factors of Cenozoic sequence stratigraphy in Wan ’ an Basin, Nansha Islands

WU Dong 1，2， ZHU Xiaomin 1，2， ZHU Shifa 1，2， ZHANG Houhe3， ZHAO Dongna 1，2， L I Wei 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. CNOOC Research Center ， Beijing 100027 ， China
  • Online:2015-03-03 Published:2015-03-03

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Abstract:

 Wan’an Basin is one of the uppermost basins in the western part of Nansha Islands which develops several significant petroliferous basins. The sedimentary layer mainly consists of conglomerate, sandstone and mudstone of Cenozoic continental facies, marine-continental transitional facies and marine facies. So far, because of the restriction of many factors，the oil and gas exploration progress in Wan’an Basin is slow. A reasonable and reliable sequence stratigraphic framework is necessary and important for analyzing tectonic-sedimentation evolution history and predicting the distribution of sandstone and implementing lithological reservoirs. Based on the drilling, logging and 2D seismic data, under the guidance of sequence stratigraphic theory and method, combined with the tectonicsedimentation evolution background of Cenozoic in South China sea, this paper divided the Cenozoic into three subfirst-order sequences, six second-order sequences and ten third-order sequences （SQ1-SQ10） in Wan’an Basin. SQ1 and SQ2, corresponding to Paleocene-Eocene, can’t be identified completely because of erosion and the limit of seismic quality. The strata of SQ3-SQ10（Oligocene-Quaternary） were developed completely and mainly composed of sand-shale and marine limestone of marine-continental transitional faceis. The controlling factors of sequence stratigraphic development include tectonic movement, sea level change and sediments supply, among which the tectonic movement is the most important factor.

Key words: pyrobitumen, paleo-reservoir, string beads reflection, accumulation process, Yingshan Formation, Tarim Basin

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